Kjb Marr Kjb Marr - 6 months ago 18
Android Question

My app crashes when using addView()

Im a noob at android. My app keeps crashing whenever I use ViewGroup addView() method but works when I use the Activity addContentView() method.

The reason I want to use addView() instead of addContentView() is that I want to be able to remove the layouts when not needed which is not possible with addContentView().

Code:
MainActivity.java

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

//CAMERA VIEW
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

surfaceView = (SurfaceView)findViewById(R.id.surfaceview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

ViewGroup rootView = (ViewGroup) findViewById(R.layout.activity_main);
LayoutInflater mLayoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);

//GRAPHICS VIEW
glSurfaceView = new GLSurfaceView(this);
glSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
glSurfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
glSurfaceView.setRenderer(new GLRenderer());
//crash
//rootView.addView(glSurfaceView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
//not crash
addContentView(glSurfaceView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
glSurfaceView.setZOrderMediaOverlay(true);

//CONTROLS VIEW
View ctrlLayout = mLayoutInflater.inflate(R.layout.activity_controls, rootView);
//crash
//rootView.addView(ctrlLayout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
//not crash
addContentView(ctrlLayout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
ctrlLayout.bringToFront();
textView = (TextView)ctrlLayout.findViewById(R.id.text);
rtTextView = (TextView)ctrlLayout.findViewById(R.id.rt_text);
btnStart = (Button)ctrlLayout.findViewById(R.id.button1);
}


activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity" >

<SurfaceView
android:id="@+id/surfaceview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />

</RelativeLayout>


activity_controls.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="14dp"
android:text="@string/hello_world" />

<TextView
android:id="@+id/rt_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="18dp"
android:layout_marginTop="14dp"
android:text="@string/str_rttext" />

<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/rt_text"
android:layout_centerHorizontal="true"
android:text="@string/str_title"
android:textAppearance="?android:attr/textAppearanceLarge" />

<Button
android:id="@+id/button1"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/btn_start" />

</RelativeLayout>


EDIT:

I changed my code as suggested by FD_

ViewGroup rootView = mLayoutInflater.inflate(R.layout.activity_main, null);
Now when I call setContentView(rootView) at the end of onCreate function, it crashes.

Here is the logcat:

02-16 08:00:28.142: I/dalvikvm(2153): threadid=1: stack overflow on call to Landroid/view/View;.isLayoutDirectionInherited:Z
02-16 08:00:28.142: I/dalvikvm(2153): method requires 12+20+4=36 bytes, fp is 0xb02fe320 (32 left)
02-16 08:00:28.152: I/dalvikvm(2153): expanding stack end (0xb02fe300 to 0xb02fe000)
02-16 08:00:28.152: I/dalvikvm(2153): Shrank stack (to 0xb02fe300, curFrame is 0xb0303ec4)
02-16 08:00:28.152: D/AndroidRuntime(2153): Shutting down VM
02-16 08:00:28.152: W/dalvikvm(2153): threadid=1: thread exiting with uncaught exception (group=0xb1aeab90)
02-16 08:00:28.932: D/dalvikvm(2153): GC_FOR_ALLOC freed 117K, 6% free 3266K/3448K, paused 80ms, total 86ms
02-16 08:00:29.382: D/dalvikvm(2153): GC_FOR_ALLOC freed 356K, 11% free 3423K/3844K, paused 46ms, total 47ms
02-16 08:00:29.402: E/AndroidRuntime(2153): FATAL EXCEPTION: main
02-16 08:00:29.402: E/AndroidRuntime(2153): Process: com.example.previewcamera, PID: 2153
02-16 08:00:29.402: E/AndroidRuntime(2153): java.lang.StackOverflowError
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5713)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetResolvedLayoutDirection(ViewGroup.java:5714)
02-16 08:00:29.402: E/AndroidRuntime(2153): at android.view.ViewGroup.resetRes
02-16 08:00:29.632: D/dalvikvm(2153): GC_FOR_ALLOC freed 548K, 16% free 3386K/4000K, paused 54ms, total 55ms

FD_ FD_
Answer

You have to call setContentView() before you can use findViewById() in your Activity. Additionally, findViewById() returns views that are included in the content view and identified by the id value passed as the argument, so passing a layout resource will never work.

Another option is to inflate the View yourself, using LayoutInflater:

LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroup rootView  = inflater.inflate(R.layout.main, null);
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