Android Surfaceview线程和内存泄漏

我在 android中创建一个游戏,我注意到游戏有内存泄漏.我设法将内存泄漏隔离到一个较小的应用程序,以便我可以看到很好的尝试和解决,如何解决它.

该应用程序使用一个surfaceview作为其视图,并附加一个线程,以便完成所有绘图到屏幕.当我开始一个新活动并关闭我当前正在使用的活动时,会发生内存泄漏.当我在我的测试应用程序上执行内存转储时,我可以看到这一点,因为它只是打开并关闭一个活动(活动a – >活动b – >活动a).我有点想法如何解决这个问题,因为iv尝试将我创建的所有引用归零(在线程内),iv尝试在我销毁视图时从surfaceview中删除回调,并且在活动中,它似乎没有任何区别.

MemoryLeakActivity.java

package memory.leak;

import memory.leak.view.MemoryLeak;
import android.app.Activity;
import android.os.Bundle;

public class MemoryLeakActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new MemoryLeak(this));
    }
}

MemoryLeakViewThread.java

package memory.leak.thread;

import memory.leak.view.MemoryLeak;
import android.view.SurfaceHolder;
import android.graphics.Canvas;


public class MemoryLeakViewThread extends Thread {
    private MemoryLeak view;
    private boolean run =false;

    public MemoryLeakViewThread(MemoryLeak view) {
        this.view =view;
    }

    public void setRunning(boolean run) {
        this.run =run;
    }

    @Override
    public void run() {
        Canvas canvas =null;
        SurfaceHolder holder =this.view.getHolder();
        while(this.run) {
            canvas =holder.lockCanvas();
            if(canvas !=null) {
                this.view.onDraw(canvas);
                holder.unlockCanvasAndPost(canvas);
            }
        }
        holder =null;
        this.view =null;
    }
}

MemoryLeak.java

package memory.leak.view;

import memory.leak.TestActivity;
import memory.leak.thread.MemoryLeakViewThread;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.GestureDetector.OnGestureListener;


public class MemoryLeak extends SurfaceView implements SurfaceHolder.Callback,OnGestureListener {
    private GestureDetector gesture;
    private MemoryLeakViewThread vThread;
    private Context context;

    public MemoryLeak(Context context) {
        super(context);

        this.getHolder().addCallback(this);
        this.vThread =new MemoryLeakViewThread(this);

        this.gesture =new GestureDetector(this);
        this.context =context;
    }

    public void surfaceChanged(SurfaceHolder holder,int format,int width,int height) {}

    public void surfaceCreated(SurfaceHolder holder) {
        if(!this.vThread.isAlive()) {
            this.vThread =new MemoryLeakViewThread(this);
            this.vThread.setRunning(true);
            this.vThread.start();
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        boolean retry = true;

        if(this.vThread.isAlive()) {
            this.vThread.setRunning(false);
            while(retry) {
                try {
                    this.vThread.join();
                    retry =false;
                } catch(Exception ee) {}
            }
        }

        this.vThread =null;
        this.context =null;
    }

     public boolean onTouchEvent(MotionEvent event) {
         return this.gesture.onTouchEvent(event);
     }

    @Override
    protected void onSizeChanged(int w,int h,int oldw,int oldh) {
    }

    @Override
    public void onDraw(Canvas canvas) {
        canvas.drawColor(Color.WHITE);
    }   

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    @Override
    public boolean onFling(MotionEvent e1,MotionEvent e2,float velocityX,float velocityY) {
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {}

    @Override
    public boolean onScroll(MotionEvent e1,float distanceX,float distanceY) {
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {}

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        Intent helpScreenIntent =new Intent(this.context,TestActivity.class);
        this.context.startActivity(helpScreenIntent);

        if (this.context instanceof Activity)
            ((Activity) this.context).finish();

        return true;
    }
}

TestActivity.java

package memory.leak;

import memory.leak.view.Test;
import android.app.Activity;
import android.os.Bundle;

public class TestActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new Test(this));
    }
}

TestViewThread.java

package memory.leak.thread;

import memory.leak.view.Test;
import android.view.SurfaceHolder;
import android.graphics.Canvas;


public class TestViewThread extends Thread {
    private Test panel;
    private boolean run =false;

    public TestViewThread(Test panel) {
        this.panel =panel;
    }

    public void setRunning(boolean run) {
        this.run =run;
    }

    @Override
    public void run() {
        Canvas canvas =null;
        SurfaceHolder holder =this.panel.getHolder();
        while(this.run) {
            canvas =holder.lockCanvas();
            if(canvas !=null) {
                this.panel.onDraw(canvas);
                holder.unlockCanvasAndPost(canvas);
            }
        }
        holder =null;
        this.panel =null;
    }
}

Test.java

package memory.leak.view;

import memory.leak.MemoryLeakActivity;
import memory.leak.thread.TestViewThread;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.GestureDetector.OnGestureListener;


public class Test extends SurfaceView implements SurfaceHolder.Callback,OnGestureListener {
    private GestureDetector gesture;
    private TestViewThread vThread;
    private Context context;

    public Test(Context context) {
        super(context);

        this.getHolder().addCallback(this);
        this.vThread =new TestViewThread(this);

        this.gesture =new GestureDetector(this);
        this.context =context;
    }

    public void surfaceChanged(SurfaceHolder holder,int height) {}

    public void surfaceCreated(SurfaceHolder holder) {
        if(!this.vThread.isAlive()) {
            this.vThread =new TestViewThread(this);
            this.vThread.setRunning(true);
            this.vThread.start();
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        boolean retry = true;

        if(this.vThread.isAlive()) {
            this.vThread.setRunning(false);
            while(retry) {
                try {
                    this.vThread.join();
                    retry =false;
                } catch(Exception ee) {}
            }
        }

        this.vThread =null;
        this.context =null;
    }

     public boolean onTouchEvent(MotionEvent event) {
         return this.gesture.onTouchEvent(event);
     }

    @Override
    protected void onSizeChanged(int w,int oldh) {
    }

    @Override
    public void onDraw(Canvas canvas) {
        canvas.drawColor(Color.RED);
    }   

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    @Override
    public boolean onFling(MotionEvent e1,MemoryLeakActivity.class);
        this.context.startActivity(helpScreenIntent);

        if (this.context instanceof Activity)
            ((Activity) this.context).finish();

        return true;
    }
}

– 编辑 –
我将视图类更改为其surfaceDestroyed(SurfaceHolder持有者),以便在线程被告知停止时,它将设置线程必须为null的视图.我所做的改变是

public void surfaceDestroyed(SurfaceHolder holder) {
        boolean retry = true;

        if(this.vThread.isAlive()) {
            this.vThread.setRunning(false);
            while(retry) {
                try {
                    this.vThread.join();
                    retry =false;
                } catch(Exception ee) {}
            }
            this.vThread.setRunning(false,null);
        }

        this.vThread =null;
        this.context =null;
        this.gesture =null;
    }

您还需要将surfaceCreated(SurfaceHolder holder)方法更改为

public void surfaceCreated(SurfaceHolder holder) {
        if(!this.vThread.isAlive()) {
            this.vThread =new MemoryLeakViewThread();
            this.vThread.setRunning(true,this);
            this.vThread.start();
        }
    }

然后在线程类我们需要更改以下内容

public MemoryLeakViewThread() {
    }

    public void setRunning(boolean run) {
        this.run =run;
    }

    public void setRunning(boolean run,MemoryLeak view) {
        this.run =run;
        this.view =view;
    }

通过这样做似乎解决了问题,现在唯一的问题是线程似乎留在内存中,由于线程类和线程组.但我认为这可能是由于调试器.

解决方法

在onSurfaceCreated中创建新的Thread时,不应该在构造函数中创建新的Thread.将您的代码与我的示例进行比较： How can I use the animation framework inside the canvas?

原文链接：https://www.f2er.com/android/317791.html

Android Surfaceview线程和内存泄漏

解决方法

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