SurfaceView shows black screen - Android
I had this same problem. I tested my APP on different emulators.
This was my MainActivity class
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private SurfaceViewTest test;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
test = new SurfaceViewTest(this);
setContentView(test);
}
@Override
protected void onResume() {
super.onResume();
test.resume();
}
}
SurfaceViewTest.java
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.SurfaceView;
public class SurfaceViewTest extends SurfaceView implements Runnable {
private Thread thread;
volatile boolean running;
public SurfaceViewTest(Context context) {
super(context);
}
@Override
public void run() {
while(running) {
draw();
}
}
private void draw(){
if(getHolder().getSurface().isValid()) {
Canvas canvas = getHolder().lockCanvas();
canvas.drawColor(Color.argb(255, 255, 0, 0));
getHolder().unlockCanvasAndPost(canvas);
}
}
public void resume() {
running = true;
thread = new Thread(this);
thread.start();
}
public void pause() {
running = false;
while (thread.isAlive()) {
try {
thread.join(100);
if(thread.isAlive()) {
thread.interrupt();
thread.join();
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="android:windowFullscreen">true</item>
</style>
<style name="Theme.AppCompat.Light.NoActionBar.FullScreen" parent="@style/Theme.AppCompat.Light">
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="android:windowFullscreen">true</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:background">#000000</item><!-- Remove it to fix the problem -->
</style>
</resources>
I solved it removing the item background from styles.xml
<item name="android:background">#00000</item>
It looks a problem with the alpha channel.