Layout <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:id="@+id/txt" /> <Button android:id="@+id/btnStartTime" android:text="开始计时" android:layout_width="80dip" android:layout_height="wrap_content" ></Button> <Button android:id="@+id/btnStopTime" android:text="停止计时" android:layout_width="80dip" android:layout_height="wrap_content" /> <SeekBar android:id="@+id/SeekBar01" android:layout_width="match_parent" android:layout_height="wrap_content"></SeekBar> </LinearLayout>
这里使用TextView 来显示倒计时的时间变化,两个按钮用于控制时间的开始和停止。SeekBar主要是用于查看线程是否被阻塞(阻塞时无法拖动)。
onCreate @Override publicvoid onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); txt = (TextView) findViewById(R.id.txt); btnStart = (Button) findViewById(R.id.btnStartTime); btnStop = (Button) findViewById(R.id.btnStopTime); Log.d("ThreadId", "onCread:" + String.valueOf(Thread.currentThread().getId())); myHandler =new Handler(this); btnStart.setOnClickListener(this); btnStop.setOnClickListener(this); }
发送消息 @Override publicvoid onClick(View v) { switch (v.getId()) { case R.id.btnStartTime: startTimer(); break; case R.id.btnStopTime: timer.cancel(); break; } } privatesynchronizedvoid startTimer() { timer =new Timer(); // TimerTask updateTimerValuesTask = new TimerTask() { // @Override // public void run() { // updateTimerValues(); // } // // }; //自定义的CallBack模式。Task继承自TimerTask Task updateTimerValuesTask =new Task(this); timer.schedule(updateTimerValuesTask, 1000, 1000); } //执行耗时的倒计时任务。 privatevoid updateTimerValues() { total--; Log.d("ThreadId", "send:" + String.valueOf(Thread.currentThread().getId())); Message msg=new Message(); Bundle date =new Bundle();// 存放数据 date.putInt("time", total); msg.setData(date); msg.what=0; myHandler.sendMessage(msg); //另一种写法 // Message msg=myHandler.obtainMessage(); // Bundle date = new Bundle();// 存放数据 // date.putInt("time", total); // msg.setData(date); // msg.what=0; // msg.sendToTarget(); } @Override publicvoid TaskRun() { updateTimerValues(); }
ICallBack接口和Task类 publicinterface ITaskCallBack { void TaskRun(); } publicclass Task extends TimerTask { private ITaskCallBack iTask; public Task(ITaskCallBack iTaskCallBack) { super(); iTask=iTaskCallBack; } publicvoid setCallBack(ITaskCallBack iTaskCallBack) { iTask=iTaskCallBack; } @Override publicvoid run() { // TODO Auto-generated method stub iTask.TaskRun(); } }
实现CallBack /** * 实现消息处理 */ @Override publicboolean handleMessage(Message msg) { switch(msg.what) { case0: Bundle date=msg.getData(); txt.setText(String.valueOf(date.getInt("time"))); Log.d("ThreadId", "HandlerMessage:" + String.valueOf(Thread.currentThread().getId())); Log.d("ThreadId", "msgDate:" + String.valueOf(date.getInt("time"))); break; } returnfalse; }
自定义的线程类 ** * 自定义的线程类,通过传入的Handler,和Total 定期执行耗时操作 * @author linzijun * */ publicclass TimerThread extends Thread { publicint Total=60; public Handler handler; /** * 初始化构造函数 * @param mhandler handler 用于发送消息 * @param total 总周期 */ public TimerThread(Handler mhandler,int total) { super(); handler=mhandler; Total=total; } @Override publicvoid run() { while(true) { Total--; if(Total<0) break; try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } Message msg=new Message(); Bundle date =new Bundle();// 存放数据 date.putInt("time", Total); msg.setData(date); msg.what=0; Log.d("ThreadId", "Thread:" + String.valueOf(Thread.currentThread().getId())); handler.sendMessage(msg); } super.run(); } }
POST publicclass PostHandler extends Activity implements OnClickListener, Runnable { private TextView txt; private Button btnStart, btnStop; private Handler myHandler; private Timer timer; privateint total =60; @Override protectedvoid onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); txt = (TextView) findViewById(R.id.txt); btnStart = (Button) findViewById(R.id.btnStartTime); btnStop = (Button) findViewById(R.id.btnStopTime); Log.d("ThreadId", "onCread:" + String.valueOf(Thread.currentThread().getId())); myHandler =new Handler() { @Override publicvoid handleMessage(Message msg) { switch(msg.what) { case0: Bundle date=msg.getData(); txt.setText(String.valueOf(date.getInt("time"))); Log.d("ThreadId", "HandlerMessage:" + String.valueOf(Thread.currentThread().getId())); Log.d("ThreadId", "msgDate:" + String.valueOf(date.getInt("time"))); break; } } }; btnStart.setOnClickListener(this); btnStop.setOnClickListener(this); } @Override publicvoid onClick(View v) { switch (v.getId()) { case R.id.btnStartTime: //myHandler.post(this); myHandler.postDelayed(this, 1000); break; case R.id.btnStopTime: break; } } @Override publicvoid run() { while(true) { total--; if(total<0) break; try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } Message msg=new Message(); Bundle date =new Bundle();// 存放数据 date.putInt("time", total); msg.setData(date); msg.what=0; Log.d("ThreadId", "POST:" + String.valueOf(Thread.currentThread().getId())); myHandler.sendMessage(msg); Log.d("ThreadId", "Thread:" + String.valueOf(Thread.currentThread().getId())); } } }
代码 package zijunlin.me; import java.util.Timer; import android.app.Activity; import android.os.Bundle; import android.os.Handler; 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; publicclass PostHandler extends Activity implements OnClickListener, Runnable { private TextView txt; private Button btnStart, btnStop; private Handler myHandler; private Timer timer; privateint total =60; private TimerThread timerThread; @Override protectedvoid onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); txt = (TextView) findViewById(R.id.txt); btnStart = (Button) findViewById(R.id.btnStartTime); btnStop = (Button) findViewById(R.id.btnStopTime); Log.d("ThreadId", "onCread:" + String.valueOf(Thread.currentThread().getId())); myHandler =new Handler() { @Override publicvoid handleMessage(Message msg) { switch(msg.what) { case0: Bundle date=msg.getData(); txt.setText(String.valueOf(date.getInt("time"))); Log.d("ThreadId", "HandlerMessage:" + String.valueOf(Thread.currentThread().getId())); Log.d("ThreadId", "msgDate:" + String.valueOf(date.getInt("time"))); break; } } }; btnStart.setOnClickListener(this); btnStop.setOnClickListener(this); } @Override publicvoid onClick(View v) { switch (v.getId()) { case R.id.btnStartTime: //myHandler.post(this); //myHandler.postDelayed(this, 1000); timerThread=new TimerThread(myHandler,60); myHandler.post(timerThread); break; case R.id.btnStopTime: break; } } @Override publicvoid run() { while(true) { total--; if(total<0) break; try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } Message msg=new Message(); Bundle date =new Bundle();// 存放数据 date.putInt("time", total); msg.setData(date); msg.what=0; Log.d("ThreadId", "POST:" + String.valueOf(Thread.currentThread().getId())); myHandler.sendMessage(msg); Log.d("ThreadId", "Thread:" + String.valueOf(Thread.currentThread().getId())); } } }