android进度条的使用（PrograssBar，SeekBar，RatingBar）_安卓 11 拖动亮度进度条,屏幕亮度不实时变化,必须手指离开才发生变化

 页面上有一个进度条，10S让进度条自动完成

<span style="font-size:14px;">import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ProgressBar;
 
import com.example.android_lb_day2.R;
 
public class PrograssBarTest extends Activity {
 
     ProgressBar bar;
     int current = 0;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
          // TODO Auto-generated method stub
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_prograssbar);
          bar = (ProgressBar) findViewById(R.id.bar);
          Thread t = new Thread(able);
          t.start();
 
     }
 
     Runnable able = new Runnable() {
 
          @Override
          public void run() {
               int max = bar.getMax();//获取进度条的最大值
               try {
                    while (max != bar.getProgress()) {
                         int step = max / 10;
                         int currentBar = bar.getProgress(); //得到当前进度条
                         bar.setProgress(step + currentBar);
                         Thread.sleep(1000);
                    }
               } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
               }
 
          }
     };
 
}</span>

ProgressBar及其子类：

ProgressBar有两个子类：SeekBar--------------------可拖拽性的进度条，一般用来调节系统音量屏幕亮度等

为RatingBar添加监听器