Android开发基础之Main线程向Worker线程发送消息

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一布局

<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">    <Button android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="send"        android:id="@+id/button"/></RelativeLayout>

如图：

二代码

    private Button button;    private Handler handler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button)this.findViewById(R.id.button);        button.setOnClickListener(new ButtonListener());        WorkerThread thread = new WorkerThread();        thread.start();    }    class ButtonListener implements View.OnClickListener {        @Override        public void onClick(View v) {            Message msg = handler.obtainMessage();            handler.sendMessage(msg);        }    }    class WorkerThread extends Thread {        public void run() {            Looper.prepare();            handler = new Handler(){                public void handleMessage(Message msg){                    System.out.println("Message From MainThread");                }            };            Looper.loop();        }    }

三结果

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