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一、Handler内存泄漏原因

handler发送的消息在当前handler的消息队列中，如果此时activity finish掉了，那么消息队列的消息依旧会由handler进行处理，若此时handler声明为内部类（非静态内部类），我们知道内部类天然持有外部类的实例引用，那么就会导致activity无法回收，进而导致activity泄露。

二、Handler内存泄漏几种情况

public class CameraVerifyActivity extends Activity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }        private class MyHandle extends Handler {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);    }}

2、显示引用

public class CameraVerifyActivity extends Activity {    MyHandle myHandler;        @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        myHandle = new MyHandle(this);    }        private class MyHandle extends Handler {        public MyHandle(Activity activity) {        }                @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);    }}

3、Handle调用Runnable

public class CameraVerifyActivity extends Activity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }    class MyRunnable implements Runnable {        private View view;        public MyRunnable(View view) {            this.view = view;        }        public void run() {            // ... do something with the view        }    }}

三、Handler内存泄漏解决方法

1、针对1（添加static）：

public class CameraVerifyActivity extends Activity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }        private static class MyHandle extends Handler {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);    }}

2、针对2（添加弱引用）：

public class CameraVerifyActivity extends Activity {    MyHandle myHandler;        @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        myHandle = new MyHandle(this);    }        private static class MyHandle extends Handler {        private WeakReference
   
     reference;        MyHandle(CameraVerifyActivity activity) {            reference = new WeakReference
    
     (activity);        }                @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);    }}
    
   

3、同2一样

四、Handler内存泄漏总结

1.使用static 修饰的handler，但是一般会弱引用activity对象，因为要使用activity对象中的成员

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