Android HandlerThread使用方法

使用场景：可以实现后台线程，比如网络请求操作，操作完成后再通过ui线程中的Handler来更新UI。

• activity_main.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".MainActivity">    <TextView        android:id="@+id/main_test_tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <Button        android:layout_alignParentBottom="true"        android:id="@+id/main_test_btn"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="测试"/></RelativeLayout>

• MainActivity.java:

package com.abc.hellohandlerthread;import android.os.Bundle;import android.app.Activity;import android.os.Handler;import android.os.Message;import android.text.format.Time;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {    private MyHandlerThread myHandlerThread = null;    private Button mTestBtn;    private TextView mTestTV;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mTestBtn = (Button)findViewById(R.id.main_test_btn);        mTestTV = (TextView)findViewById(R.id.main_test_tv);        mTestBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Message msg = new Message();                msg.what = 1;                myHandlerThread.sendMessage(msg);//                mHandler.sendMessage(msg);            }        });        myHandlerThread = new MyHandlerThread("background thread.");        myHandlerThread.setmMainHandler(mHandler);    }    final Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            if (msg.what == 2) {                Bundle bundle = msg.getData();                String threadID = bundle.getString("id");                String threadName = bundle.getString("name");                Time time = new Time();                time.setToNow();                String timeStr = time.format3339(true);                StringBuilder sb = new StringBuilder("id:").append(threadID)                        .append("\nname:").append(threadName).append("\n")                        .append("time:").append(timeStr);                mTestTV.setText(sb.toString());            }        }    };    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    }

• MyHandlerThread.java:

package com.abc.hellohandlerthread;import android.os.Bundle;import android.os.Handler;import android.os.HandlerThread;import android.os.Looper;import android.os.Message;/** * Created by dev on 11/25/13. */public class MyHandlerThread {    private HandlerThread mHandlerThread = null;    private MyHandler mHandler = null;    private Handler mMainHandler = null;    public MyHandlerThread(String threadName) {        super();        mHandlerThread = new HandlerThread(threadName);        mHandlerThread.start();        mHandler = new MyHandler(mHandlerThread.getLooper());    }    public void setmMainHandler(Handler handler) {        this.mMainHandler = handler;    }    public void sendMessage(Message msg) {        mHandler.sendMessage(msg);    }    class MyHandler extends Handler {        MyHandler() {        }        MyHandler(Looper looper) {            super(looper);        }        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            Message toMainMsg = mMainHandler.obtainMessage();            toMainMsg.what = 2;            Bundle bundle = new Bundle();            String threadID = String.valueOf(Thread.currentThread().getId());            String threadName = Thread.currentThread().getName();            bundle.putString("id", threadID);            bundle.putString("name", threadName);            toMainMsg.setData(bundle);            mMainHandler.sendMessage(toMainMsg);        }    }}