Android 进度条源码.zip

package wht.android.progressbar; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ProgressBar; public class TestBarHandler extends Activity { private ProgressBar firstBar = null;// 进度条 private Button myButton = null;// 按钮 // private int i =0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); firstBar = (ProgressBar) findViewById(R.id.firstbar); myButton = (Button) findViewById(R.id.myButton); myButton.setOnClickListener(new ButtonListener()); } class ButtonListener implements OnClickListener { @Override public void onClick(View v) { firstBar.setVisibility(View.VISIBLE);// 设置进度条可见 handler.post(progressBar); } } //使用匿名内部类来覆写handleMessage方法 Handler handler = new Handler() { @Override public void handleMessage(Message msg) { firstBar.setProgress(msg.arg1); handler.post(progressBar); } }; //定义一个线程 Runnable progressBar = new Runnable() { int i = 0; @Override public void run() { i = i + 5; Message msg = handler.obtainMessage();//得到一个消息对象，Message类由Android操作系统提供 msg.arg1 = i;//将msg对象的arg1参数的值设为i,用arg1和arg2两个成员变量传递信息，优点是系统性能消耗很少 try { Thread.sleep(1000); //设置当前线程睡眠1秒 } catch (InterruptedException e) { e.printStackTrace(); } handler.sendMessage(msg);//将msg消息加入消息队列中 if (i == 100) { handler.removeCallbacks(progressBar);//移除此线程对象 } } }; }