Java Code Examples for android.view.SurfaceHolder#lockCanvas()

The following examples show how to use android.view.SurfaceHolder#lockCanvas() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: MyWallpaperService.java From codeexamples-android with Eclipse Public License 1.0

6 votes

@Override
public void onTouchEvent(MotionEvent event) {
	if (touchEnabled) {

		float x = event.getX();
		float y = event.getY();
		SurfaceHolder holder = getSurfaceHolder();
		Canvas canvas = null;
		try {
			canvas = holder.lockCanvas();
			if (canvas != null) {
				canvas.drawColor(Color.BLACK);
				circles.clear();
				circles.add(new MyPoint(
						String.valueOf(circles.size() + 1), x, y));
				drawCircles(canvas, circles);

			}
		} finally {
			if (canvas != null)
				holder.unlockCanvasAndPost(canvas);
		}
		super.onTouchEvent(event);
	}
}

Example 2

Source File: MyWallpaperService.java From Wrox-ProfessionalAndroid-4E with Apache License 2.0

6 votes

private synchronized void drawFrame() {
  final SurfaceHolder holder = getSurfaceHolder();

  if (holder != null && holder.getSurface().isValid()) {
    Canvas canvas = null;
    try {
      canvas = holder.lockCanvas();
      if (canvas != null) {
        // Draw on the Canvas!
      }
    } finally {
      if (canvas != null && holder != null)
        holder.unlockCanvasAndPost(canvas);
    }

    // Schedule the next frame
    handler.removeCallbacks(drawSurface);
  }
  handler.postDelayed(drawSurface, 1000 / FPS);
}

Example 3

Source File: BlockDropWallpaper.java From homescreenarcade with GNU General Public License v3.0

6 votes

@Override
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    super.onSurfaceChanged(holder, format, width, height);
    if (DOLOG)
        Log.d(TAG, "onSurfaceChanged: width = [" + width + "], height = [" + height + "]");

    display = new Display(BlockDropWallpaper.this);

    if (height > width) {
        scale = (float) width / (float) height;
        yCenter = height / 2f;
    } else {
        scale = 0.8f;
        yCenter = (height / scale) / (2f * scale);
    }
    xCenter = width / 2f;

    if (getState() != STATE_PAUSED) {
        // Manually redraw with the new dimensions (it won't redraw automatically when paused)
        Canvas canvas = holder.lockCanvas();
        draw(canvas);
        holder.unlockCanvasAndPost(canvas);
    }
}

Example 4

Source File: BackgroundService.java From Asteroid with Apache License 2.0

6 votes

private void draw(SurfaceHolder holder) {
    if (holder == null || !holder.getSurface().isValid())
        return;

    Canvas canvas;
    try {
        canvas = holder.lockCanvas();
        if (canvas == null) return;
    } catch (Exception e) {
        return;
    }

    canvas.drawColor(Color.BLACK);

    background.draw(canvas, particleSpeed);

    holder.unlockCanvasAndPost(canvas);

    handler.removeCallbacks(runnable);
    handler.postDelayed(runnable, 10);
}

Example 5

Source File: ClockWallpaperService.java From android-clock-livewallpaper with MIT License

6 votes

private void draw() {
	SurfaceHolder holder = getSurfaceHolder();
	Canvas canvas = null;
	try {
		canvas = holder.lockCanvas();
		if (canvas != null) {
			draw(canvas);
		}
	} finally {
		if (canvas != null)
			holder.unlockCanvasAndPost(canvas);
	}

	handler.removeCallbacks(drawRunner);

	if (visible) {
		handler.postDelayed(drawRunner, 200);
	}
}

Example 6

Source File: ScratchOutView.java From Android-ScratchOutView with MIT License

6 votes

private void invalidSurfaceView() {
    Canvas canvas = null;
    SurfaceHolder surfaceHolder = getHolder();
    try {
        canvas = surfaceHolder.lockCanvas(null);
        if (canvas != null) {
            draw(canvas);
        }
    } catch (Exception ex) {
        ex.printStackTrace();
    } finally {
        if (canvas != null) {
            surfaceHolder.unlockCanvasAndPost(canvas);
        }
    }
}

Example 7

Source File: MeterWallpaper.java From meter with Apache License 2.0

6 votes

/**
 * Draw function doing the context locking and rendering
 */
private void draw() {
    if(mDrawer == null) return;

    // Ask the drawer if wants to draw in this frame
    if(mDrawer.shouldDraw()) {
        SurfaceHolder holder = getSurfaceHolder();
        Canvas c = null;
        try {
            // Lock the drawing canvas
            c = holder.lockCanvas();
            if (c != null) {
                // Let the drawer render to the canvas
                mDrawer.draw(c);
            }
        } finally {
            if (c != null) holder.unlockCanvasAndPost(c);
        }
    }
    mHandler.removeCallbacks(mUpdateDisplay);
    if (mVisible) {
        // Wait one frame, and redraw
        mHandler.postDelayed(mUpdateDisplay, 33);
    }
}

Example 8

Source File: ImageSurface.java From camera-ruler with GNU General Public License v2.0

6 votes

@SuppressLint("WrongCall")
@Override
public void surfaceCreated(SurfaceHolder holder) {
    Canvas canvas = null;
    try {
        canvas = holder.lockCanvas(null);
        synchronized (holder) {
            onDraw(canvas);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (canvas != null) {
            holder.unlockCanvasAndPost(canvas);
        }
    }
}

Example 9

Source File: MyWallpaperService.java From codeexamples-android with Eclipse Public License 1.0

6 votes

private void draw() {
	SurfaceHolder holder = getSurfaceHolder();
	Canvas canvas = null;
	try {
		canvas = holder.lockCanvas();
		if (canvas != null) {
			if (circles.size() >= maxNumber) {
				circles.clear();
			}
			int x = (int) (width * Math.random());
			int y = (int) (height * Math.random());
			circles.add(new MyPoint(String.valueOf(circles.size() + 1),
					x, y));
			drawCircles(canvas, circles);
		}
	} finally {
		if (canvas != null)
			holder.unlockCanvasAndPost(canvas);
	}
	handler.removeCallbacks(drawRunner);
	if (visible) {
		handler.postDelayed(drawRunner, 5000);
	}
}

Example 10

Source File: CanvasWatchFaceService.java From AndroidWear-OpenWear with MIT License

5 votes

private void draw(SurfaceHolder holder) {
    this.mDrawRequested = false;
    Canvas canvas = holder.lockCanvas();
    if (canvas == null) {
        return;
    }
    try {
        onDraw(canvas, holder.getSurfaceFrame());
    } finally {
        holder.unlockCanvasAndPost(canvas);
    }
}

Example 11

Source File: DanmakuSurfaceView.java From BlueBoard with Apache License 2.0

5 votes

@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
    isSurfaceCreated = true;
    Canvas canvas = surfaceHolder.lockCanvas();
    if (canvas != null) {
        DrawHelper.clearCanvas(canvas);
        surfaceHolder.unlockCanvasAndPost(canvas);
    }
}

Example 12

Source File: DripWallpaperService.java From drip-steps with Apache License 2.0

5 votes

private void draw() {
	SurfaceHolder holder = getSurfaceHolder();
	Canvas canvas = null;
	try {
		// redrawEverything means that the whole screen is dirty, reset all params and redraw everything
		if (redrawEverything) {
			initDimensParam(width, height);
			canvas = holder.lockCanvas();
		} else {
			canvas = holder.lockCanvas(textRect);
		}
		if (canvas != null) {
			draw(canvas);
		}
	} finally {
		if (canvas != null) {
			try {
				holder.unlockCanvasAndPost(canvas);
			} catch (Exception ignore) {
			}
		}
	}

	if (visible) {
		doFrame();
	}
}

Example 13

Source File: FractalSurfaceView.java From JPPF with Apache License 2.0

5 votes

@Override
public void run() {
  try {
    while (!stopped.get()) {
      if (!queue.isEmpty() || firstDraw.get()) {
        SurfaceHolder holder = getHolder();
        if (holder != null) {
          Canvas canvas = null;
          try {
            canvas = holder.lockCanvas();
            synchronized(holder) {
              doDraw(canvas);
            }
          } finally {
            if (canvas != null) holder.unlockCanvasAndPost(canvas);
          }
        }
      } else {
        synchronized(this) {
          wait(100L);
        }
      }
    }
  } catch(Exception e) {
    Log.e(LOG_TAG, "Exception in ViewThread.run()", e);
  }
}

Example 14

Source File: LiveWallpaperView.java From LiveWallpaper with Apache License 2.0

5 votes

private void drawSurfaceView(SurfaceHolder holder) {
    if (this.mNextBitmap != null && !this.mNextBitmap.isRecycled()) {
        Canvas localCanvas = holder.lockCanvas();
        if (localCanvas != null) {
            Rect rect = new Rect();
            rect.left = rect.top = 0;
            rect.bottom = localCanvas.getHeight();
            rect.right = localCanvas.getWidth();
            localCanvas.drawBitmap(this.mNextBitmap, null, rect, this.mPaint);
            holder.unlockCanvasAndPost(localCanvas);
        }
    }
}

Example 15

Source File: DanmakuSurfaceView.java From letv with Apache License 2.0

5 votes

public void surfaceCreated(SurfaceHolder surfaceHolder) {
    this.isSurfaceCreated = true;
    Canvas canvas = surfaceHolder.lockCanvas();
    if (canvas != null) {
        DrawHelper.clearCanvas(canvas);
        surfaceHolder.unlockCanvasAndPost(canvas);
    }
}

Example 16

Source File: FaceRegisterView.java From FastAndroid with Apache License 2.0

5 votes

/**
 * 画控件
 */
private void drawView() {
    synchronized (mSync) {
        Canvas canvas = null;
        SurfaceHolder holder = null;
        try {
            holder = getHolder();
            if (holder == null || !holder.getSurface().isValid()) return;
            //获得canvas对象
            canvas = holder.lockCanvas();
            if (canvas == null) return;
            //清除画布上面里面的内容
            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
            //绘制画布内容
            drawContent(canvas);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (holder != null && canvas != null) {
                //释放canvas锁，并且显示视图
                try {
                    holder.unlockCanvasAndPost(canvas);
                } catch (IllegalArgumentException e2) {
                    e2.printStackTrace();
                }
            }
        }
    }
}

Example 17

Source File: FaceRecognizeView.java From FastAndroid with Apache License 2.0

5 votes

/**
 * 画控件
 */
private void drawView() {
    synchronized (mSync) {
        Canvas canvas = null;
        SurfaceHolder holder = null;
        try {
            holder = getHolder();
            if (holder == null || !holder.getSurface().isValid()) return;
            //获得canvas对象
            canvas = holder.lockCanvas();
            if (canvas == null) return;
            //清除画布上面里面的内容
            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
            //绘制画布内容
            drawContent(canvas);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (holder != null && canvas != null) {
                //释放canvas锁，并且显示视图
                try {
                    holder.unlockCanvasAndPost(canvas);
                } catch (IllegalArgumentException e2) {
                    e2.printStackTrace();
                }
            }
        }
    }
}

Example 18

Source File: DanmakuSurfaceView.java From DanDanPlayForAndroid with MIT License

5 votes

@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
    isSurfaceCreated = true;
    Canvas canvas = surfaceHolder.lockCanvas();
    if (canvas != null) {
        DrawHelper.clearCanvas(canvas);
        surfaceHolder.unlockCanvasAndPost(canvas);
    }
}

Example 19

Source File: BounceFreeBar.java From IndicatorBox with MIT License

4 votes

@Override
public void surfaceCreated(SurfaceHolder holder) {
    Canvas c = holder.lockCanvas();
    draw(c);
    holder.unlockCanvasAndPost(c);
}

Example 20

Source File: SearchView.java From brailleback with Apache License 2.0

4 votes

@Override
public void invalidate() {
    super.invalidate();

    final SurfaceHolder holder = mHolder;
    if (holder == null) {
        return;
    }

    final Canvas canvas = holder.lockCanvas();
    if (canvas == null) {
        return;
    }

    // Clear the canvas.
    canvas.drawColor(Color.TRANSPARENT, Mode.CLEAR);

    if (getVisibility() != View.VISIBLE) {
        holder.unlockCanvasAndPost(canvas);
        return;
    }

    final int width = getWidth();
    final int height = getHeight();

    // Draw the pretty gradient background.
    mGradientBackground.setBounds(0, 0, width, height);
    mGradientBackground.draw(canvas);

    Paint paint = new Paint();
    paint.setColor(Color.WHITE);
    paint.setStyle(Style.FILL);
    paint.setTextAlign(Align.CENTER);
    paint.setTextSize(mContext.getResources().getDimensionPixelSize(
            R.dimen.search_text_font_size));
    canvas.drawText(
            mContext.getString(R.string.search_dialog_label, mQueryText),
            width / 2.0f,
            height / 2.0f,
            paint);

    holder.unlockCanvasAndPost(canvas);
}