Android如何防止内存泄漏（二）

一，防止持有Activity引用，不要在Activity创建内部类
直接另外建立一个class java文件，用来建立handler ,然后用弱引用保存Activity,然后用instanceof来比较是不是当前Acitivity

public class MyHandler extends Handler {

    private WeakReference mActivity;

    public MyHandler(Activity activity) {
        mActivity = new WeakReference(activity);
    }

    @Override
    public void handleMessage(Object msg) {
        super.handleMessage(msg);
        Log.e("print", msg.toString());
        ServiceTestActivity testActivity = (ServiceTestActivity) mActivity.get();
        testActivity.upDaterUI("测试handler");
    }
}
///在Acitivity实现方法
 public void upDaterUI(Object msg){
///start_Service 代表是某个控件
        start_Service.setText(msg);
    }

二、AsyncTask也是使用这种方式，也另外建立一个类

三、单例模式下的 弱引用 注册监听事件等

public class Singleton {

    private static Singleton singleton;

    private WeakReference<CallBack> callBack;

    public static Singleton getInstance() {
        if (singleton == null) {
            singleton = new Singleton();
        }
        return singleton;
    }

    public void setCallBack(CallBack callBack) {
        this.callBack = new WeakReference<>(callBack);
    }

    public CallBack getCallBack() {
        return callBack.get();
    }

    public interface CallBack {
        void callBack();
    }

}