private Handler mRemoteHandler = new SafeHandler(this);private static final int INIT_UI = 1;/*** safe handler 静态内部类*/private static class SafeHandler extends Handler {private final WeakReference<MainActivity> mActivitys;public SafeHandler(MainActivity preview) {mActivitys = new WeakReference<MainActivity>(preview);}@Overridepublic void handleMessage(Message msg) {MainActivity activity = mActivitys.get();if (activity != null) {if (null != msg) {switch (msg.what) {case INIT_UI:activity.initView();activity.updateUI();break;default:break;}}}}}

import android.os.AsyncTask;
import android.text.TextUtils;import com.roadrover.settings.network.NetSupplier;
import com.roadrover.settings.network.NetworkBean;
import com.roadrover.utils.Logcat;import java.lang.ref.WeakReference;
import java.util.Arrays;/**
不是内部类*/
public class HotSpotSafeTask extends AsyncTask<Void, Void, String[]> {// 弱引用允许Activity被垃圾收集器清理private final WeakReference<HotSpotFragment> weakFragment;public HotSpotSafeTask(HotSpotFragment fragment) {this.weakFragment = new WeakReference<>(fragment);}@Overridepublic String[] doInBackground(Void... params) {// do async stuff here// 重新获取Fragment的强引用，并且判断是否存活HotSpotFragment fragment = weakFragment.get();if (fragment == null || fragment.isDetached()) {// Fragment死亡了，不再做任何的事情return null;}String[] config = fragment.getWifiApConfig();return config;}@Overridepublic void onPostExecute(String[] config) {// 重新获取Fragment的强引用，并且判断是否存活HotSpotFragment fragment = weakFragment.get();if (fragment == null || fragment.isDetached()) {// Fragment死亡了，不再做任何的事情return;}// The Fragment is still valid, do main-thread stuff hereif ((config != null) && (config.length == 3)) {if (null != fragment) {Logcat.d("getWifiApConfig " + Arrays.toString(config));fragment.setName(config[0]);if (!TextUtils.isEmpty(config[1])) {fragment.setPassword(config[1]);} }}}
}