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...

Interpreting hex dump of java class file

java,class,hex

The 000000b0 is not part of the data. It's the memory address where the following 16 bytes are located. The two-digit hex numbers are the actual data. Read them from left to right. Each row is in two groups of eight, purely to asist in working out memory addresses etc....

Can I install 2 or more Android SDK when using Eclipse

java,android,eclipse,sdk,versions

There shouldn't be any problem if you use the latest SDK version ; actually, this is recommended. However, make sure to set the correct "Target SDK", i.e. the highest android version you have successfully tested your app with, and the "Minimum Required SDK" as well....