我的这个应用程序有点问题！ 这段代码：
package com.project.alpha_droid;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
Bitmap img;
ImageView imagew;
void fill(int x, int y, int c){
if(img.getPixel(x,y)!=c){
img.setPixel(x,y,c);
if(img.getPixel(x+1,y)!=c){
fill(x+1,y,c);
}
if(img.getPixel(x,y+1)!=c){
fill(x,y+1,c);
}
if(img.getPixel(x-1,y)!=c){
fill(x-1,y,c);
}
if(img.getPixel(x,y-1)!=c){
fill(x,y-1,c);
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imagew = (ImageView) findViewById(R.id.drawing);
imagew.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
Log.d("Location", event.getX() + "x" + event.getY());
img = ((BitmapDrawable)imagew.getDrawable()).getBitmap();
fill(Math.round(event.getX()),Math.round(event.getY()), 0);
imagew.setImageBitmap(img);
return true;
}
});
}
}
引发以下错误：
09-24 12:15:09.981 12764-12764/com.project.alpha_droid E/InputEventReceiver: Exception dispatching input event.
09-24 12:15:09.981 12764-12764/com.project.alpha_droid E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
09-24 12:15:09.981 12764-12764/com.project.alpha_droid E/MessageQueue-JNI: java.lang.IllegalStateException
at android.graphics.Bitmap.setPixel(Bitmap.java:1746)
at com.project.alpha_droid.MainActivity.fill(MainActivity.java:19)
at com.project.alpha_droid.MainActivity$1.onTouch(MainActivity.java:47)
at android.view.View.dispatchTouchEvent(View.java:9181)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2691)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2308)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2691)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2308)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2691)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2308)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2691)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2308)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2691)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2308)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2691)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2308)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2743)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1836)
at android.app.Activity.dispatchTouchEvent(Activity.java:3043)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:63)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2704)
at android.view.View.dispatchPointerEvent(View.java:9397)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5082)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4899)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4356)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4409)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4375)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4501)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4383)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4558)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4356)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4409)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4375)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4383)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4356)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6979)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6852)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6823)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7069)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:143)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:6934)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
填充功能应该充当油漆中的桶，您可以用颜色填充您点击的空间。
答案 0 :(得分：2)
您可以尝试将Bitmap复制到另一个可变的内容中。
final Bitmap oldBitmap = ((BitmapDrawable) imagew.getDrawable()).getBitmap();
//set the second param of copy to true so we get a **mutable** bitmap
img = oldBitmap.copy(oldBitmap.getConfig, true);
//recycle old. We don't need it anymore
//oldBitmap.getBitmap().recycle()
fill(Math.round(event.getX()),Math.round(event.getY()), 0);
imagew.setImageBitmap(img);