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- com.example.adam.hilo E/AndroidRuntime: FATAL EXCEPTION: Thread-2096
- com.example.adam.hilo E/AndroidRuntime: Process: com.example.adam.hilo, PID: 19788
- com.example.adam.hilo E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.isRecycled()' on a null object reference
- com.example.adam.hilo E/AndroidRuntime: at android.graphics.Canvas.throwIfCannotDraw(Canvas.java:1281)
- com.example.adam.hilo E/AndroidRuntime: at android.graphics.Canvas.drawBitmap(Canvas.java:1337)
- com.example.adam.hilo E/AndroidRuntime: at com.example.adam.hilo.Activity_Staircase_Layout.run(Activity_Staircase_Layout.java:36)
- com.example.adam.hilo E/AndroidRuntime: at java.lang.Thread.run(Thread.java:818)
- public class Activity_Staircase_Layout extends SurfaceView implements Runnable {
- Thread thread = null;
- boolean can_draw;
- Bitmap background;
- Canvas canvas;
- SurfaceHolder surface_holder;
- public Activity_Staircase_Layout(Context context) {
- super(context);
- surface_holder = getHolder();
- background = BitmapFactory.decodeResource(getResources(), R.drawable.simple);
- }
- @Override
- public void run() {
- while(can_draw) {
- if(!surface_holder.getSurface().isValid()) {
- continue;
- }
- canvas = surface_holder.lockCanvas();
- canvas.drawBitmap(background,0,0,null);
- surface_holder.unlockCanvasAndPost(canvas);
- }
- }
- public void pause() {
- can_draw = false;
- while(true) {
- try {
- thread.join();
- break;
- } catch (InterruptedException e) {
- e.printStackTrace();
- }
- }
- thread = null;
- }
- public void resume() {
- can_draw = true;
- thread = new Thread(this);
- thread.start();
- }
- }
- <?xml version="1.0" encoding="utf-8"?>
- <shape
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:shape="rectangle">
- <!-- Specify a semi-transparent solid green background color -->
- <solid android:color="#5500FF66" />
- <!-- Specify a dark green border -->
- <stroke
- android:width="5dp"
- android:color="#009933" />
- </shape>
- public class StaircaseActivity extends AppCompatActivity {
- Activity_Staircase_Layout staircase_LayoutView;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- staircase_LayoutView = new Activity_Staircase_Layout(this);
- setContentView(staircase_LayoutView);
- }
- @Override
- public void onPause() {
- super.onPause();
- staircase_LayoutView.pause();
- }
- @Override
- public void onResume() {
- super.onResume();
- staircase_LayoutView.resume();
- }
- }
- if(background != null){
- canvas.drawBitmap(background,0,0,null);
- } else {
- Log.d("DEBUG","background is null");
- }
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