HandlerThread.getLooper().removeSyncBarrier(token);
HandlerThread.getLooper().getQueue().removeSyncBarrier(token);

import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.MessageQueue;

import java.lang.reflect.Method;

/**
* 使用Handler方式實(shí)現(xiàn)的預(yù)加載
* @author billy.qi
*/
public class PreLoader {

 private int token;
 private Handler mainThreadHandler;//用于將結(jié)果處理的task放在主線程中執(zhí)行
 private HandlerThread handlerThread;//提供一個(gè)異步線程來(lái)運(yùn)行預(yù)加載任務(wù)
 private Handler handler;//預(yù)加載使用的handler

 private PreLoader(final Runnable task) {
 mainThreadHandler = new Handler(Looper.getMainLooper());
 handlerThread = new HandlerThread("pre-loader") {
  @Override
  protected void onLooperPrepared() {
  super.onLooperPrepared();
  handler = new Handler();
  handler.post(task);
  //設(shè)置同步分割,后面post進(jìn)來(lái)的sync為true的message將暫停執(zhí)行
  Looper looper = handlerThread.getLooper();
  if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
   postSyncBarrier(looper.getQueue());
  } else {
   postSyncBarrier(looper);
  }
  }
 };
 handlerThread.start();
 }

 /**
 * 開(kāi)啟預(yù)加載
 * 比如:開(kāi)始網(wǎng)絡(luò)請(qǐng)求(在HandlerThread中執(zhí)行)
 * @param task 預(yù)加載任務(wù)
 */
 public static PreLoader preLoad(Runnable task) {
 return new PreLoader(task);
 }

 /**
 * 處理加載結(jié)果, 一般在預(yù)加載任務(wù)處理完成后調(diào)用
 * 由于有handler所在的messageQueue設(shè)置了同步分割(SyncBarrier),該task
 * @param task 在主線程中執(zhí)行的任務(wù)
 */
 public void performResultTask(final Runnable task) {
 if (handler != null) {
  handler.post(new Runnable() {
  @Override
  public void run() {
   mainThreadHandler.post(task);
  }
  });
 }
 }

 /**
 * 可以開(kāi)始執(zhí)行預(yù)加載結(jié)果處理
 */
 public void readyToGetData() {
 Looper looper = handlerThread.getLooper();
 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
  removeSyncBarrier(looper.getQueue());
 } else {
  removeSyncBarrier(looper);
 }
 }

 private void postSyncBarrier(Object obj) {
 try{
  Method method = MessageQueue.class.getMethod("postSyncBarrier");
  token = (int) method.invoke(obj);
 } catch(Exception e) {
  e.printStackTrace();
 }
 }

 private void removeSyncBarrier(Object obj) {
 try{
  Method method = MessageQueue.class.getMethod("removeSyncBarrier", int.class);
  method.invoke(obj, token);
 } catch(Exception e) {
  e.printStackTrace();
 }
 }

 public void destroy() {
 handlerThread.quit();
 handlerThread = null;
 handler = null;
 mainThreadHandler = null;
 }

}

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class PreLoaderActivity extends AppCompatActivity {

 private PreLoader preLoader;
 private TextView textView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 preLoad();//啟動(dòng)預(yù)加載
 //進(jìn)行頁(yè)面布局加載及其它初始化工作
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 textView = (TextView)findViewById(R.id.textView);
 //布局初始化完成
 preLoader.readyToGetData();
 }

 private void preLoad() {
 //預(yù)加載的任務(wù)
 preLoader = PreLoader.preLoad(new Runnable() {
  //將得到的請(qǐng)求結(jié)果展示到布局控件上
  @Override
  public void run() {
  //模擬網(wǎng)絡(luò)請(qǐng)求耗時(shí)
  try {
   Thread.sleep(500);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
  final String result = "result";
  //在UI線程執(zhí)行的顯示任務(wù)
  preLoader.performResultTask(new Runnable() {
   //將得到的請(qǐng)求結(jié)果展示到布局控件上
   @Override
   public void run() {
   textView.setText(result);
   }
  });
  }
 });
 }

 @Override
 protected void onDestroy() {
 super.onDestroy();
 //在onDestroy()中進(jìn)行銷毀
 preLoader.destroy();
 }
}