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Android compiles but crashes

Tag: java,android,android-layout,listview,android-intent

i am trying to develop my first app. It compiles and installs but crashes when I open it.

Here is the Code

public class MainActivity extends ActionBarActivity implements OnItemClickListener {
private  ListView listview;
private DrawerLayout drawerlayout;
private ActionBarDrawerToggle drawerListener;
private LinearLayout menu;
private myAdapter myadapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    listview=(ListView)findViewById(R.id.ListView);




    myadapter=new myAdapter(this);
    listview.setOnItemClickListener(this);
    listview.setAdapter(myadapter);
    drawerlayout=(DrawerLayout)findViewById(R.id.drawerLayout);

    drawerListener= new ActionBarDrawerToggle(this,drawerlayout,R.drawable.ic_ic_drawer,R.string.app_name, R.string.app_name){
            @Override
            public void onDrawerClosed(View drawerView) {

                Toast.makeText(MainActivity.this, "ola", Toast.LENGTH_LONG).show();
                menu=(LinearLayout)findViewById(R.id.menu_lateral);
                 menu.setVisibility(View.VISIBLE);
                super.onDrawerClosed(drawerView);

        }



            @Override
            public void onDrawerOpened(View drawerView) {
                menu=(LinearLayout)findViewById(R.id.menu_lateral);
                 menu.setVisibility(View.GONE);
                super.onDrawerOpened(drawerView);
            }
    };




    drawerlayout.setDrawerListener(drawerListener);
    getSupportActionBar().setHomeButtonEnabled(true);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

}


@Override
public void onPostCreate(Bundle savedInstanceState,
        PersistableBundle persistentState) {
    drawerListener.syncState();
    super.onPostCreate(savedInstanceState, persistentState);
}

@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) {
if(drawerListener.onOptionsItemSelected(item)){
    return true;
}
    return super.onOptionsItemSelected(item);
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    // TODO Auto-generated method stub
    super.onConfigurationChanged(newConfig);
    drawerListener.onConfigurationChanged(newConfig);
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {

    class myAdapter extends BaseAdapter{
private Context context;
View row=null;
String [] menu;
int [] images ={R.drawable.ic_contact, R.drawable.menu, R.drawable.ic_reservas, R.drawable.ic_map, R.drawable.galeria, R.drawable.info, R.drawable.facebook };

public myAdapter(Context context) {
menu=context.getResources().getStringArray(R.array.slide);
this.context=context;
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return menu.length;
}
@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return menu[position];
}
@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if(convertView==null){
        View row=null;
        LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row=inflater.inflate(R.layout.custom_row, parent, false);
    }
    else
    {
        row=convertView;
    }

    TextView titulo=(TextView) row.findViewById(R.id.textView1);
    ImageView icone=(ImageView) row.findViewById(R.id.imageView1);

    titulo.setText(menu[position]);
    icone.setImageResource(images[position]);
    return row;
}

And here is the log cat

    06-13 18:55:12.842: D/OpenGLRenderer(4763): Render dirty regions requested: true
06-13 18:55:12.862: D/Atlas(4763): Validating map...
06-13 18:55:12.942: I/Adreno-EGL(4763): <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.AF.1.1.04.04.03.164.081_msm8960_LA.AF.1.1__release_AU ()
06-13 18:55:12.942: I/Adreno-EGL(4763): OpenGL ES Shader Compiler Version: E031.25.01.03
06-13 18:55:12.942: I/Adreno-EGL(4763): Build Date: 11/02/14 Sun
06-13 18:55:12.942: I/Adreno-EGL(4763): Local Branch: mybranch5454281
06-13 18:55:12.942: I/Adreno-EGL(4763): Remote Branch: quic/l_LNX.LA.3.6
06-13 18:55:12.942: I/Adreno-EGL(4763): Local Patches: NONE
06-13 18:55:12.942: I/Adreno-EGL(4763): Reconstruct Branch: AU_LINUX_ANDROID_LA.AF.1.1.04.04.03.164.081 + db92d1e + cb8de02 +  NOTHING
06-13 18:55:12.942: I/OpenGLRenderer(4763): Initialized EGL, version 1.4
06-13 18:55:12.972: D/OpenGLRenderer(4763): Enabling debug mode 0
06-13 18:55:13.072: D/AndroidRuntime(4763): Shutting down VM
06-13 18:55:13.102: E/AndroidRuntime(4763): FATAL EXCEPTION: main
06-13 18:55:13.102: E/AndroidRuntime(4763): Process: com.example.alambique, PID: 4763
06-13 18:55:13.102: E/AndroidRuntime(4763): java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
06-13 18:55:13.102: E/AndroidRuntime(4763):     at com.example.alambique.myAdapter.getView(MainActivity.java:155)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.AbsListView.obtainView(AbsListView.java:2346)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.ListView.makeAndAddView(ListView.java:1864)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.ListView.fillDown(ListView.java:698)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.ListView.fillFromTop(ListView.java:759)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.ListView.layoutChildren(ListView.java:1673)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.AbsListView.onLayout(AbsListView.java:2150)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:931)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:493)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.View.layout(View.java:15596)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewGroup.layout(ViewGroup.java:4966)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2072)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1829)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5786)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.Choreographer.doCallbacks(Choreographer.java:580)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.Choreographer.doFrame(Choreographer.java:550)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.os.Handler.handleCallback(Handler.java:739)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.os.Handler.dispatchMessage(Handler.java:95)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.os.Looper.loop(Looper.java:135)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at android.app.ActivityThread.main(ActivityThread.java:5256)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at java.lang.reflect.Method.invoke(Native Method)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at java.lang.reflect.Method.invoke(Method.java:372)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
06-13 18:55:13.102: E/AndroidRuntime(4763):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
06-13 18:55:13.162: I/Process(4763): Sending signal. PID: 4763 SIG: 9

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How to set speaker phone off when the app is killed by the “Recent App drawer”

android,android-audiomanager,ondestroy

Use a service like: public class FirstService extends Service { private AudioManager audioManager; @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onDestroy() { super.onDestroy(); audioManager.setSpeakerphoneOn(false); //Turn of speaker } } public void onDestroy () Added in API level 1 Called by the system to notify a...

Mysterious claim of a missing { in eclipse

java,eclipse

In Java, you cannot write executable statements directly in class.So this is syntactically wrong: for(int i=0; i<10; i++) { this.colorList[i] = this.allColors[this.r.nextInt(this.allColors.length)]; } Executable statements can only be in methods/constructors/code blocks...

Get network interfaces on remote machine

java,network-programming

No, we cannot by definition. The IP address is needed to hide the mac address from external world. To retrieve it you definitely need some code running on that machine. It means that you need some kind of agent. You can either implement it in Java or use platform specific...