Android: le dessin d'une toile à vue

Je suis en train de dessiner une toile qui contient un cercle à un point de vue qui a été défini précédemment via findViewById() comme ceci

    View v = findViewById(R.id.view1);
    Bitmap b = Bitmap.createBitmap(v.getMeasuredWidth(), v.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(b);
    Paint paint = new Paint();
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.WHITE);
    c.drawCircle(v.getMeasuredWidth() / 2, v.getMeasuredHeight() / 2, v.getMeasuredWidth() / 4, paint);
    v.draw(c);

mais il n'y a pas de cercle tracé à la vue

L'ensemble de mon activité:

package com.burrlieexample.test;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class InstructionsActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d("DEBUG", "InstruciotnActivity");
setContentView(R.layout.activity_instructions);
Button okay = (Button) findViewById(R.id.okButton);
okay.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//TODO Auto-generated method stub
finish();
}
});
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
//TODO Auto-generated method stub
super.onWindowFocusChanged(hasFocus);
Log.d("DEBUG", "onFocusChanged");
//im doing this stuff in onWindowfocusChanged because getWidth returns 0 in onCreate
View v = findViewById(R.id.view1);
Log.d("DEBUG", "" + v.getMeasuredWidth() + ", " + v.getMeasuredHeight());
Bitmap b = Bitmap.createBitmap(v.getMeasuredWidth(), v.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
Paint paint = new Paint();
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.WHITE);
c.drawCircle(v.getMeasuredWidth() / 2, v.getMeasuredHeight() / 2, v.getMeasuredWidth() / 4, paint);
v.draw(c);
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}

et la Vue est dans ma mise en page fichier xml comme ceci

<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:background="#D0F3FF"
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="com.burrlieexample.test.InstructionsActivity" >
<Button
android:id="@+id/okButton"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="52dp"
android:background="#00455F"
android:hapticFeedbackEnabled="true"
android:text="Ok!" />
<View
android:id="@+id/view1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/okButton"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
</RelativeLayout>

Ainsi, lorsque l'Activité commence les seules choses que je vois sont sur le bouton et le fond de ma relative disposition

InformationsquelleAutor Darius | 2015-09-02