handler内存泄漏原因有两个：
第一：
public final Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(new Runnable() {
@Override
public void run() {
load(url);
handler.sendEmptyMessage(1);
}
}).start();
}
子线程耗时操作，当用户回到home，子线程还在运行，handler非静态内部类，持有外部类的引用，导致MainActivity无法回收，造成内存泄漏；
第二：
public final Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
handler.postDelayed(new Runnable() {
@Override
public void run() {
load(url);
}
},1000*60*5);
}
handler延时执行，5分钟之内，MainActivity回收不了，造成内存泄漏。
解决方法 第一种：
public MyHandler(MainActivity activity) {
this.mActivity = new WeakReference<MainActivity>(activity);
}
@Override
public void handleMessage(Message msg) {
// super.handleMessage(msg);
MainActivity mainActivity = mActivity.get();
if (mainActivity == null) {
return;
}
//code
}
}
private final MyHandler mHandler = new MyHandler(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(new Runnable() {
@Override
public void run() {
load(url);
mHandler.sendEmptyMessage(1);
}
}).start();
}
@Override
protected void onDestroy() {
super.onDestroy();
mHandler.removeCallbacks(1);
}
解决方法 第二种：
private static class MyHandler extends Handler{
private final WeakReference<MainActivity> mActivity;
public MyHandler(MainActivity activity) {
this.mActivity = new WeakReference<MainActivity>(activity);
}
@Override
public void handleMessage(Message msg) {
// super.handleMessage(msg);
MainActivity mainActivity = mActivity.get();
if (mainActivity == null) {
return;
}
//code
}
}
private static final Runnable MyRunnable = new Runnable() {
@Override
public void run() {
}
};
private final MyHandler mHandler = new MyHandler(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler.postDelayed(MyRunnable,1000*60*5);
}
@Override
protected void onDestroy() {
super.onDestroy();
mHandler.removeCallbacks(MyRunnable);
}
