Database Users

[Q] Item separator in ListView fails! Why?

i have a problem with ListView, i don't view line separator for each item, why ? see where is mouse pointer:
h_t_t_p://tinyurl.com/2vqg52n
and this is source code:
Java Class:
Code:
public class ScienzeInfoNewsActivity extends Activity {
private class Link {
private String title;
private String href;
public Link(String title, String href) {
this.title = title;
this.href = href;
}
public String toString() {
return title;
}
public String getHref() {
return href;
}
}
private FeedReader feedReader;
private ArrayAdapter<Link> adapter;
private ListView list;
public void initialize() {
adapter = new ArrayAdapter<Link>(this, R.layout.textview);
list = (ListView) findViewById(R.id.ListView01);
list.setAdapter(adapter);
}
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initialize();
loadFeeds(adapter);
setAllListener();
}
private void setAllListener() {
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> a, View v, int position,
long id) {
String link = adapter.getItem((int) id).getHref();
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(link));
startActivity(intent);
}
});
Button exit = (Button) findViewById(R.id.Button02);
exit.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
ScienzeInfoNewsActivity.this.finish();
}
});
Button refresh = (Button) findViewById(R.id.Button01);
refresh.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
loadFeeds(adapter);
}
});
}
private void loadFeeds(ArrayAdapter<Link> adapter) {
if (adapter != null)
adapter.clear();
try {
feedReader = new FeedReader(new URL(
"rss.php"));
String feeds[][] = feedReader.getFeeds();
for (int i = 0; i < feeds.length; i++) {
adapter.add(new Link(feeds[i][0], feeds[i][1]));
}
} catch (Exception e) {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}
R.layout.textview:
Code:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="h_t_t_p://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="16sp" >
</TextView>
I load entry item with this function loadFeeds()
If i select one of the items without a separator, it just one item.
Thanks for any reply.

[Q] How to create youtube start/stop function for video recording function? HELP!

Is there a way to get the entire surfaceView screen to function like a button which start/atop a video recording process whenever it sees fit by the user? The function is somewhat similar to youTube's start/stop play function but instead this time it is used to start/stop the video recording process.
Is the code suppose to be coded in the .xml file or my .java file to accomplish the task? Sorry i'm rather new to android/java and given only 6 more weeks to finish this assignment by my lecturer to complete an app which act like a car blackbox yet i'm a total beginner in programming... Any help would be appreciated... Thanks in advance...
This is what i tried so far, can someone guide me i'm really in a desperate situation, PLEASE HELP ME :'(
Code:
public class CameraTest extends Activity implements SurfaceHolder.Callback {
private static final String TAG = "Exception";
public static SurfaceView surfaceView;
public static SurfaceHolder surfaceHolder;
public static Camera camera;
public static boolean previewRunning;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
surfaceView = (SurfaceView)findViewById(R.id.surface_camera);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
Button btnStart = (Button) findViewById(R.id.button4);
btnStart.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
startService(new Intent(getApplicationContext(), ServiceRecording.class));
}
});
Button btnStop = (Button) findViewById(R.id.button5);
btnStop.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
stopService(new Intent(getApplicationContext(), ServiceRecording.class));
}
});
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
if (camera != null) {
Camera.Parameters params = camera.getParameters();
camera.setParameters(params);
}
else {
Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
finish();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (previewRunning) {
camera.stopPreview();
}
Camera.Parameters p = camera.getParameters();
p.setPreviewSize(320, 240);
p.setPreviewFormat(PixelFormat.JPEG);
camera.setParameters(p);
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
previewRunning = true;
}
catch (IOException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
}
}
@Override
public void onResume(){
super.onResume();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder){
camera.stopPreview();
previewRunning = false;
camera.release();
}
}
My serviceRecording.java file
Code:
public class ServiceRecording extends Service {
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
public static Camera ServiceCamera;
private boolean RecordingStatus;
private MediaRecorder mediaRecorder;
private final int maxDurationInMs = 20000;
private static final String TAG = "Exception";
@Override
public void onCreate() {
super.onCreate();
RecordingStatus = false;
ServiceCamera = CameraTest.MainCamera;
surfaceView = CameraTest.surfaceView;
surfaceHolder = CameraTest.surfaceHolder;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
if (RecordingStatus == false)
startRecording();
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
stopRecording();
RecordingStatus = false;
}
public boolean startRecording(){
try {
Toast.makeText(getBaseContext(), "Recording Started", Toast.LENGTH_SHORT).show();
try{
ServiceCamera.unlock();
}
catch(Exception e){
ServiceCamera.reconnect();
}
mediaRecorder = new MediaRecorder();
mediaRecorder.setCamera(ServiceCamera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
mediaRecorder.setMaxDuration(maxDurationInMs);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
//mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH_mm_ss");
Date date = new Date();
File directory = new File(Environment.getExternalStorageDirectory() + "/VideoList");
if(!(directory.exists()))
directory.mkdir();
File FileSaved = new File(Environment.getExternalStorageDirectory() + "/VideoList", dateFormat.format(date) + ".3gp");
mediaRecorder.setOutputFile(FileSaved.getPath());
mediaRecorder.setVideoSize(surfaceView.getWidth(),surfaceView.getHeight());
//mediaRecorder.setVideoFrameRate(videoFramesPerSecond);
mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
mediaRecorder.prepare();
mediaRecorder.start();
RecordingStatus = true;
return true;
}
catch (IllegalStateException e) {
Log.d(TAG,e.getMessage());
e.printStackTrace();
return false;
}
catch (IOException e) {
Log.d(TAG,e.getMessage());
e.printStackTrace();
return false;
}
}
public void stopRecording() {
Toast.makeText(getBaseContext(), "Recording Stopped", Toast.LENGTH_SHORT).show();
mediaRecorder.stop();
try {
ServiceCamera.reconnect();
} catch (IOException e) {
e.printStackTrace();
}
RecordingStatus = false;
}
}
My .xml file
Code:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/frameLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_height="match_parent"
android:layout_width="match_parent">
<Button
android:text="Video"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
></Button>
<Button
android:text="Setting"
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button1"
></Button>
<Button
android:text="Back"
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button2"
></Button>
<Button
android:text="Start"
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button3"
></Button>
<Button
android:text="Stop"
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button4"
></Button>
<SurfaceView
android:id="@+id/surface_camera"
android:layout_width="480dp"
android:layout_height="320dp"
android:layout_toRightOf="@+id/button2"
></SurfaceView>
<TextView
android:text="TextView"
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/button2"
></TextView>
<TextView
android:text="TextView"
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
></TextView>
<TextView
android:text="TextView"
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
></TextView>
</RelativeLayout>
</FrameLayout>

someone answer me please, i really need your guys help...

why isn't someone answering is my question so unwelcoming?

Haiz can anyone help me, i really need some guidance and help here...

You want to
Code:
implement OnClickListener
add method
Code:
onClick(View v)
then you want to add
Code:
surfaceView.setOnClickListener(this);
When surface is clicked onClick is called

By any chance could you explain how should i implement the above said functions into my codes because like implement onclicklistener and this and that i don't quite understand where should i place these above codes??
And how should this above function handle my startService and stopService intents? Will the surfaceview also the show the same invisible button effects seen in youtube too when being clicked? Could you guide me in this in much more details, sorry if i'm kinna stupid to understand your explanations...

Ok
CameraTest.java
Add
Code:
public void onClick(View v){
}
Replace
Code:
public class CameraTest extends Activity implements SurfaceHolder.Callback {
with
Code:
public class CameraTest extends Activity implements SurfaceHolder.Callback, OnClickListener {
After
Code:
surfaceView = (SurfaceView)findViewById(R.id.surface_camera);
Add
Code:
surfaceView.setOnClickListener(this);
how should this above function handle my startService and stopService intents?
Click to expand...
Click to collapse
Your intent function calls the CameraTest.surfaceView so everything will work with whatever code you put in the onClick function.
Will the surfaceview also the show the same invisible button effects seen in youtube too when being clicked?
Click to expand...
Click to collapse
Need better explanation on what you are asking.

The last part is probably like how when you tap a YouTube video on the video itself it kinda flashes the play or pause button over the video.
Sent from my MIUI SCH-i500

Which of these should i import?
Code:
import android.content.DialogInterface.OnClickListener;
import android.view.View.OnClickListener;
Should i put startService and stopService intent together, but it seems not appropriate as both statement seems to conflict each other when i click to start/stop my service? Or i need add some sort of if.. else logic statement to differentiate the start/stop service alternating when being clicked?
Code:
public void onClick(View v){
startService(new Intent(getApplicationContext(), ServiceRecording.class));
startService(new Intent(getApplicationContext(), ServiceRecording.class));
}
Yes that was what i meant for the last part of my question the sort of effect it will display when being clicked, sorry if i could not explain well which might cause you some confusion.. Thanks for your help

Or should i be implementing some sort of imagebutton to emulate the above effect i mention or is there some other way to do it?

Can someone answer me??

Can someone please guide me on my above problem to get the result similar to what was like youtube??

[Q] Drawable not visible when camera preview is present

First of all, this is my first post here so hello everyone.
I'm writing an app that requires displaying a semi-transparent PNG layer over a camera preview. Everything was fine until I wanted to publish it and make sure it works also on Android 2.x. It seems that on older versions of Android, the camera preview causes the drawable (in my case, a subclass of ImageView) to not show. The whole screen is white, but the buttons are visible. When I get rid of the preview, it works just fine - the drawable is visible as it should. It works like this both on the emulator and on real devices.
Here is my code (the whole project is in the attachment). The most interesting and probably guilty class is CameraPreview. The code doesn't crash, there's also no exceptions or other behavior like this.
MainActivity.java
Code:
public class MainActivity extends Activity
{
CameraPreview mPreview;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mPreview = (CameraPreview)this.findViewById(R.id.cameraPreview);
}
[user=439709]@override[/user]
protected void onResume()
{
super.onResume();
mPreview.resume();
}
[user=439709]@override[/user]
protected void onPause()
{
super.onPause();
mPreview.pause();
}
}
CameraPreview.java
Code:
class CameraPreview extends ViewGroup implements SurfaceHolder.Callback
{
private final String TAG = "Preview";
SurfaceView mSurfaceView;
SurfaceHolder mHolder;
Size mPreviewSize;
List<Size> mSupportedPreviewSizes;
Camera mCamera;
Context mContext;
int currentCamera = 0;
int noOfCameras = 0;
public CameraPreview(Context context)
{
super(context);
}
[user=1299008]@supp[/user]ressLint("NewApi")
[user=1299008]@supp[/user]ressWarnings("deprecation")
public CameraPreview(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
mContext = context;
mSurfaceView = new SurfaceView(context);
addView(mSurfaceView);
mHolder = mSurfaceView.getHolder();
mHolder.addCallback(this);
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
// checking what cameras we have
if(Build.VERSION.SDK_INT > Build.VERSION_CODES.FROYO)
{
noOfCameras = Camera.getNumberOfCameras();
CameraInfo cameraInfo = new CameraInfo();
for(int i=0; i<noOfCameras; i++)
{
Camera.getCameraInfo(i, cameraInfo);
if(cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK)
{
currentCamera = i;
break;
}
}
}
}
public CameraPreview(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
public void setCamera(Camera camera)
{
if(mCamera != null && camera == null)
mCamera.release();
mCamera = camera;
if(mCamera != null)
{
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
requestLayout();
}
}
[user=439709]@override[/user]
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(width, height);
if(mSupportedPreviewSizes != null)
mPreviewSize = getOptimalPreviewSize(width, height);
}
[user=439709]@override[/user]
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
if(changed && getChildCount() > 0)
{
final View child = mSurfaceView;
final int width = r - l;
final int height = b - t;
int previewWidth = width;
int previewHeight = height;
if(mPreviewSize != null)
{
previewWidth = mPreviewSize.width;
previewHeight = mPreviewSize.height;
}
final int scaledChildHeight = previewHeight * width / previewWidth;
child.layout(0, (height - scaledChildHeight)/2, width, (height + scaledChildHeight) / 2);
}
}
public void surfaceCreated(SurfaceHolder holder)
{
try
{
if(mCamera != null)
mCamera.setPreviewDisplay(holder);
}
catch(IOException exception)
{
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
}
public void surfaceDestroyed(SurfaceHolder holder)
{
if(mCamera != null)
mCamera.stopPreview();
}
// Chooses such preview's size that it just one "step" wider
// than needed. This ensures sharpness of the preview.
private Size getOptimalPreviewSize(int w, int h)
{
Size optimalSize = null;
int optimalWidth = 0;
for(Size size : mSupportedPreviewSizes)
{
if(size.width > optimalWidth)
{
optimalSize = size;
if(size.width >= w)
break;
}
}
return optimalSize;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
{
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
requestLayout();
mCamera.setParameters(parameters);
mCamera.startPreview();
}
public void resume()
{
setCamera(Camera.open());
}
public void pause()
{
setCamera(null);
}
}
CustomImageView.java
Code:
// aligns the content image to the top
public class CustomImageView extends ImageView
{
public CustomImageView(Context context, AttributeSet attrs)
{
super(context, attrs);
setScaleType(ScaleType.MATRIX);
}
[user=439709]@override[/user]
protected boolean setFrame(int l, int t, int r, int b)
{
Matrix matrix = getImageMatrix();
float scaleFactor = getWidth()/(float)getDrawable().getIntrinsicWidth();
matrix.setScale(scaleFactor, scaleFactor, 0, 0);
setImageMatrix(matrix);
return super.setFrame(l, t, r, b);
}
}
activity_main.xml
Code:
<FrameLayout xmlns:android="h t t p:// schemas.android.com /apk/res/android"
xmlns:tools="h t t p:/ /schemas.android.com /tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context=".MainActivity"
android:background="#ffe9eaed" >
<com.example.drawabletest.CameraPreview
android:id="@+id/cameraPreview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FFFF" />
<com.example.drawabletest.CustomImageView
android:id="@+id/fbTemplate"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:src="@drawable/template2" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Small Text"
android:textAppearance="?android:attr/textAppearanceSmall" />
</FrameLayout>
Also, I'm not sure why the preview itself doesn't work. I've read that on Android 2.x emulators, the test image from the emulated camera is just this plain white by design, so I assumed it's ok. However, my friend tested the app on his phone with Android 2.3 and the preview appeared to be plain black. I guess it's a subject for a separate question, but maybe you'll notice something in the code.
I've spent a few days now to solve these two problems, so any clues would be really helpful. Thank you!

First of all, welcome to the forum.
Please do it as described here: http://forum.xda-developers.com/showthread.php?t=2439748
Post the code within
Code:
tags in the thread. Makes it easier for us. ;)
That way you'd get much more help (maybe from me ;)).

Could you provide at least a working example of camera preview for Android 2.x? I don't believe it can't be done. Does it need some kind of deprecated API to work correctly?

Problem with ListViewAnimation from nhaarman

Hi guys I have a problem with the cool lib from nhaarman
I integrated successfully his lib with an activity extends ListActivity
Code:
public class MainActivity extends ListActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getListView().setDivider(null);
MyAdapter adapter = new MyAdapter();
//setListAdapter(adapter);
ScaleInAnimationAdapter swingRightInAnimationAdapter = new ScaleInAnimationAdapter(adapter);
swingRightInAnimationAdapter.setAbsListView(getListView());
setListAdapter(swingRightInAnimationAdapter);
for(int i = 0 ; i<10; i++)
{
adapter.add("task" + String.valueOf(i));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class MyAdapter extends ArrayAdapter<String>
{
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView tv = (TextView) convertView;
if (tv == null) {
tv = new TextView(MainActivity.this);
}
tv.setText(getItem(position));
return tv;
}
}
}
This code above is working fine. The list_rows are fading in the screen.
But now I want to integrate this lib into a fragment with a listview within:
Code:
public class FragmentTask extends Fragment{
ListView listView;
MyAdapter adapter;
View view;
public FragmentTask() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d(new Exception().getStackTrace()[0].getClassName(), new Exception().getStackTrace()[0].getMethodName());
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_tasks, container, false);
Button button = (Button) view.findViewById(R.id.btn_newTask);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
adapter.add("task");
adapter.notifyDataSetChanged();
}
});
listView = (ListView) view.findViewById(R.id.taskListView);
listView.setDivider(null);
adapter = new MyAdapter(view.getContext());
ScaleInAnimationAdapter swingRightInAnimationAdapter = new ScaleInAnimationAdapter(adapter);
swingRightInAnimationAdapter.setAbsListView(listView);
listView.setAdapter(swingRightInAnimationAdapter);
return view;
}
private class MyAdapter extends ArrayAdapter<String>
{
Context context;
private MyAdapter(Context context) {
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.list_row,parent, false);
TextView title = (TextView) row.findViewById(R.id.textView);
title.setText(getItem(position));
return row;
}
}
}
Now I have the effect that the rows only fade in if i "spam" new rows so that I have to scroll down. So the list items which were hided appear now with the fade-effect. But the other list items which have room in the listview without scrolling are not fading.
Do you understand me?
Please help me
edit: here is my fragment_tasks.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout .....">
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="New Task"
android:id="@+id/btn_newTask"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/taskListView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_above="@+id/btn_newTask"
/>
</RelativeLayout>

[Q] nullpointer and wrap_content problems

Hello there
I got 2 problems:
Firstly, if I launch the following code on my device, I'm getting a nullpointer, and I got no idea why. ( I know it's sorta basic stuff)
Secondly, I want toset the screen height and lenght to wrap_content, it's red marked in the code...that is also not working..
Could you maybe help out a noob?
Code:
public class Game extends Activity implements OnClickListener{
Button start_time;
Button sec;
int i = 0;
TextView textview1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
start_time = (Button) findViewById(R.id.start_time);
start_time.setOnClickListener(this);
textview1 = (TextView) findViewById(R.id.textView1);
/*
sec = (Button) findViewById(R.id.sec);
sec.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
long totalTime = SystemClock.elapsedRealtimeNanos()- startTime;
Intent intent = new Intent(Game.this, MainScreen.class);
intent.putExtra("time",totalTime);
startActivity(intent);
}
});
*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.game, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
Random r = new Random();
int x = r.nextInt([COLOR="Red"]wrap_content[/COLOR]);
int y = r.nextInt([COLOR="Red"]wrap_content[/COLOR]);
long startTime = SystemClock.elapsedRealtime();
i++;
View b = findViewById(R.id.start_time);
b.setX(x);
b.setY(y);
if (i == 1 ) {
b.setX(+9);
b.setY(+5);
}
if (i == 2 ) {
b.setX(x);
b.setY(y);
}
if (i == 3 ) {
b.setX(x);
b.setY(y);
}
else if (i == 4) {
long difference = SystemClock.elapsedRealtime() - startTime;
Intent intent = new Intent(Game.this, MainScreen.class);
intent.putExtra("time",difference);
// Toast.makeText(getApplicationContext(), getIntent().getStringExtra("time"), Toast.LENGTH_LONG).show();
textview1.setText(getIntent().getStringExtra("time"));
finish();
}
}
}

For the wrap_content one, you need to set that property to the view that holds the integer text, you can't set a height and width properties to an integer, only a view or other widgets such as buttons. So for you you should set the properties of the view with ID start_time to wrap_content for width and height - recommend doing this in the layout XML instead of java code.
I'm guessing that if you sort that out your null pointer will disappear.
Additionally in your public onClick(View v) method you should check the ID of the view before doing any function code, this means you can have multiple objects using the same listener.
So this:
Code:
@Override
public void onClick(View v) {
Random r = new Random();
... etc
Should become this:
Code:
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.start_time:
Random r = new Random();
... etc

tahnks @Jonny for your answer, I changed the code, but now, my button isn't placed randomly on each click anymore, and I'm getting the nullpointer again. have a look:
Code:
public class Game extends Activity implements OnClickListener{
Button start_time;
Button sec;
int i = 0;
TextView textview1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
start_time = (Button) findViewById(R.id.start_time);
start_time.setOnClickListener(this);
textview1 = (TextView) findViewById(R.id.textView1);
/*
sec = (Button) findViewById(R.id.sec);
sec.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
long totalTime = SystemClock.elapsedRealtimeNanos()- startTime;
Intent intent = new Intent(Game.this, MainScreen.class);
intent.putExtra("time",totalTime);
startActivity(intent);
}
});
*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.game, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
Random r = new Random();
int x = r.nextInt(+1);
int y = r.nextInt(+1);
long startTime = SystemClock.elapsedRealtime();
i++;
View b = findViewById(R.id.wrap_content);
b.setX(x);
b.setY(y);
if (i == 1 ) {
b.setX(+9);
b.setY(+5);
}
if (i == 2 ) {
b.setX(x);
b.setY(y);
}
if (i == 3 ) {
b.setX(x);
b.setY(y);
}
else if (i == 4) {
long difference = SystemClock.elapsedRealtime() - startTime;
Intent intent = new Intent(Game.this, MainScreen.class);
intent.putExtra("time",difference);
// Toast.makeText(getApplicationContext(), getIntent().getStringExtra("time"), Toast.LENGTH_LONG).show();
textview1.setText(getIntent().getStringExtra("time"));
finish();
}
}
}
and the xml
Code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="ch.asddd.af.Game" >
<Button
android:id="@+id/start_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="139dp"
android:text="Button" />
<Button
android:id="@+id/sec"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/start_time"
android:layout_below="@+id/start_time"
android:layout_marginLeft="17dp"
android:layout_marginTop="89dp"
android:text="Button"
android:visibility="gone"/>
<View
android:id="@+id/wrap_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</RelativeLayout>
thank you. I'm really happy, there exists such great help

i have now changed the view start_time to a button...because it actually IS a button (im stupid) but now, when I click on the button, it moves completely out of the screen, and if not, instead of getting the time, the app stopps again with nullpointer. It should stay in the screen, placed randomly on click and after some clicks, I want to recieve the elapsed time. what is this?
code:
Code:
public class Game extends Activity implements OnClickListener{
Button start_time;
Button sec;
int i = 0;
TextView textview1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
start_time = (Button) findViewById(R.id.start_time);
start_time.setOnClickListener(this);
textview1 = (TextView) findViewById(R.id.textView1);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.game, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
Random r = new Random();
int x = r.nextInt(R.id.wrap_content);
int y = r.nextInt(R.id.wrap_content);
long startTime = SystemClock.elapsedRealtime();
i++;
Button b = (Button) findViewById(R.id.start_time);
b.setX(x);
b.setY(y);
if (i == 1 ) {
b.setX(+9);
b.setY(+5);
}
if (i == 2 ) {
b.setX(x);
b.setY(y);
}
if (i == 3 ) {
b.setX(x);
b.setY(y);
}
else if (i == 4) {
long difference = SystemClock.elapsedRealtime() - startTime;
Intent intent = new Intent(Game.this, MainScreen.class);
intent.putExtra("time",difference);
// Toast.makeText(getApplicationContext(), getIntent().getStringExtra("time"), Toast.LENGTH_LONG).show();
textview1.setText(getIntent().getStringExtra("time"));
finish();
}
}
}
and the xml:
Code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="chdfss.dsfwegg.trhhGame" >
<Button
android:id="@+id/start_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="139dp"
android:text="Button" />
<Button
android:id="@+id/sec"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/start_time"
android:layout_below="@+id/start_time"
android:layout_marginLeft="17dp"
android:layout_marginTop="89dp"
android:text="Button"
android:visibility="gone"/>
<View
android:id="@+id/wrap_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</View>
</RelativeLayout>

I'm not familiar with the nextInt() function (I can look it upp later when I'm home) but I'm pretty sure you shouldn't be parsing a views ID as one of its conditions - eg you're doing nextInt(R.id.wrap_content), are you sure that's right?