android thread線程通訊

參考：http://codinghard.wordpress.com/2009/05/16/android-thread-messaging/

下載連結

源碼：

package sample.thread.messaging;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;/** * @author davidkuo * */public class ThreadMessaging extends Activity {        private static final String TAG = "ThreadMessaging";    private TextView mTextView;    private Handler mMainHandler, mChildHandler;        /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        mTextView = (TextView)findViewById(R.id.text);                /*         * Create the main handler on the main thread so it is bound to the main         * thread's message queue.          */        mMainHandler = new Handler() {                        public void handleMessage(Message msg) {                                Log.i(TAG, "Got an incoming message from the child thread - "  + (String)msg.obj);                                /*                 * Handle the message coming from the child thread.                 */                mTextView.setText(mTextView.getText() + (String)msg.obj + "\n");            }        };                /*         * Start the child thread.         */        new ChildThread().start();                Log.i(TAG, "Main handler is bound to - " + mMainHandler.getLooper().getThread().getName());         Button button = (Button)findViewById(R.id.button);        button.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                                /*                 * We cannot guarantee that the mChildHandler is created                  * in the child thread by the time the user clicks the button.                 */                if (mChildHandler != null) {                                        /*                      * Send a message to the child thread.                     */                    Message msg = mChildHandler.obtainMessage();                    msg.obj = mMainHandler.getLooper().getThread().getName() + " says Hello";                    mChildHandler.sendMessage(msg);                    Log.i(TAG, "Send a message to the child thread - " + (String)msg.obj);                }            }        });    }        @Override    protected void onDestroy() {                Log.i(TAG, "Stop looping the child thread's message queue");                /*         * Remember to stop the looper         */        mChildHandler.getLooper().quit();                super.onDestroy();    }    class ChildThread extends Thread {                private static final String INNER_TAG = "ChildThread";                public void run() {                        this.setName("child");                        /*             * You have to prepare the looper before creating the handler.             */            Looper.prepare();                        /*             * Create the child handler on the child thread so it is bound to the             * child thread's message queue.             */            mChildHandler = new Handler() {                                public void handleMessage(Message msg) {                                    Log.i(INNER_TAG, "Got an incoming message from the main thread - " + (String)msg.obj);                                        /*                     * Do some expensive operation there. For example, you need                     * to constantly send some data to the server.                     */                    try {                                                /*                         * Mocking an expensive operation. It takes 100 ms to                         * complete.                         */                        sleep(100);                                                /*                         * Send the processing result back to the main thread.                         */                        Message toMain = mMainHandler.obtainMessage();                        toMain.obj = "This is " + this.getLooper().getThread().getName() +                             ".  Did you send me \"" + (String)msg.obj + "\"?";                        mMainHandler.sendMessage(toMain);                        Log.i(INNER_TAG, "Send a message to the main thread - " + (String)toMain.obj);                                            } catch (InterruptedException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                }            };                        Log.i(INNER_TAG, "Child handler is bound to - " + mChildHandler.getLooper().getThread().getName());                        /*             * Start looping the message queue of this thread.             */            Looper.loop();        }    }}

 

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