dialog的进度条

 import android.app.Activity;
 import android.app.ProgressDialog;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.View;
 import android.widget.Button;

 public class MainActivity extends Activity {
     ProgressDialog dialog=null;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         Button btn=(Button) findViewById(R.id.btn);
         btn.setOnClickListener(new View.OnClickListener() {
         @Override
             public void onClick(View arg0) {
                 dialog=new ProgressDialog(MainActivity.this);
                 dialog.setMax(100);//设置最大值
                 dialog.setTitle("安装进度");
                 dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);//设置进度条样式，水平样式
                 dialog.show();//显示对话框

                 /*
                  * 定义一个线程，重写run（）方法
                  */
                 Thread thread=new Thread(){
                     public void run(){
                         while(true){
                             dialog.incrementProgressBy(1);//设置每次增加的进度
                             /**进度条的值超过100时，让进度条消失*/
                             if(dialog.getProgress()>=100){
                                 dialog.dismiss();
                             }
                             try {
                                 Thread.sleep(1000);
                             } catch (InterruptedException e) {
                                 e.printStackTrace();
                             }
                         }
                     }
                 };
                 thread.start();//启动线程
             }
         });

     }

     @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;
     }

 }