java - MessageQueue 回调中的异常：handleReceiveCallback 洪水填充算法 Android
问题描述
我正在 Android 中创建一个 Unicorn Color 应用程序，用选定的颜色为触摸的白色像素着色。我在下面找到了有关如何从可绘制图像中创建位图并获取触摸区域的点 x、y 方向和 targetColor 以用replacementColor替换它的算法。
这是我的算法代码：
public void floodFill(Bitmap image, Point node, int targetColor,
int replacementColor) {
int width = image.getWidth();
int height = image.getHeight();
int target = targetColor;
int replacement = replacementColor;
if (target != replacement) {
Queue<Point> queue = new LinkedList<Point>();
do {
int x = node.x;
int y = node.y;
while (x > 0 && image.getPixel(x - 1, y) == target) {
x--;
}
boolean spanUp = false;
boolean spanDown = false;
while (x < width && image.getPixel(x, y) == target) {
image.setPixel(x, y, replacement);
if (!spanUp && y > 0 && image.getPixel(x, y - 1) == target) {
queue.add(new Point(x, y - 1));
spanUp = true;
} else if (spanUp && y > 0
&& image.getPixel(x, y - 1) != target) {
spanUp = false;
}
if (!spanDown && y < height - 1
&& image.getPixel(x, y + 1) == target) {
queue.add(new Point(x, y + 1));
spanDown = true;
} else if (spanDown && y < height - 1
&& image.getPixel(x, y + 1) != target) {
spanDown = false;
}
x++;
}
} while ((node = queue.poll()) != null);
}
}
这是我创建的使用算法的方法
imageView.setOnTouchListener(new ImageView.OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
final Point p1 = new Point();
//this code I have initialized in the onCreate above but put it here for deceleration
// bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.unicorn_1);
int x = (int)event.getX();
int y = (int)event.getY();
Point point = new Point();
point.x = x;
point.y = y;
final int sourceColor = bitmap.getPixel((int) x, (int) y);
FloodFill(bitmap,point,sourceColor,Color.RED);
return true;
}
});
但我收到此错误：
E/InputEventReceiver: Exception dispatching input event.
E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
E/MessageQueue-JNI: java.lang.IllegalStateException
at android.graphics.Bitmap.setPixel(Bitmap.java:1771)
at com.example.unicornbookcolor.FastImageTry.FloodFill(FastImageTry.java:86)
at com.example.unicornbookcolor.FastImageTry.access$200(FastImageTry.java:20)
at com.example.unicornbookcolor.FastImageTry$3.onTouch(FastImageTry.java:69)
at android.view.View.dispatchTouchEvent(View.java:11931)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:527)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1875)
at android.app.Activity.dispatchTouchEvent(Activity.java:3453)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:477)
at android.view.View.dispatchPointerEvent(View.java:12183)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5510)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5260)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4742)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4802)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4761)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4910)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4769)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4967)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4742)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4802)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4761)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4769)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4742)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7494)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7468)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7425)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7612)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:186)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:325)
at android.os.Looper.loop(Looper.java:159)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:514)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:888)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.unicornbookcolor, PID: 2420
java.lang.IllegalStateException
at android.graphics.Bitmap.setPixel(Bitmap.java:1771)
at com.example.unicornbookcolor.FastImageTry.FloodFill(FastImageTry.java:86)
at com.example.unicornbookcolor.FastImageTry.access$200(FastImageTry.java:20)
at com.example.unicornbookcolor.FastImageTry$3.onTouch(FastImageTry.java:69)
at android.view.View.dispatchTouchEvent(View.java:11931)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3052)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2646)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:527)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1875)
at android.app.Activity.dispatchTouchEvent(Activity.java:3453)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:477)
at android.view.View.dispatchPointerEvent(View.java:12183)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5510)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5260)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4742)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4802)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4761)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4910)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4769)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4967)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4742)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4802)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4761)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4769)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4742)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7494)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7468)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7425)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7612)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:186)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:325)
at android.os.Looper.loop(Looper.java:159)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:514)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:888)
如何解决这个问题并通过算法方法获得所需的参数？
解决方案
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