Android UI control series: ProgressBar (progress bar)

When Android performs some background operations, such as loading games and playing songs, the user does not know the progress of the program execution. At this time, the progress bar can be used to display the progress.

The Andorid system provides two types of progress bars, the long progress bar (progressBarStyleHorizontal) and the circular progress bar (progressBarStyleLarge). The default progress bar on the Android platform is the second type. In addition, you can also set a progress bar in the title bar of the form. This requires setting the display style of the form "requestWindowFeature(Window.FEATURE_PROGRESS)" first; if you want to display this progress bar, you also need to use setProgressBarVisibility(true); Method to display

The following is an example, which consists of a title bar progress bar, a long progress bar and a circular progress bar, and is controlled by threads.

Note: The circular progress bar will not display specific progress, but simply rotates

package org.hualang.progress;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.ProgressBar;

public class ProgressBarTest extends Activity
{
        //声明ProgressBar对象
        private ProgressBar pro1;
        private ProgressBar pro2;
        private Button btn;
        protected static final int STOP_NOTIFIER = 000;
        protected static final int THREADING_NOTIFIER = 111;
        public int intCounter=0;
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState)
        {
                super.onCreate(savedInstanceState);
                //设置窗口模式，，因为需要显示进度条在标题栏
                requestWindowFeature(Window.FEATURE_PROGRESS);
                //设置标题栏上的进度条可见
                setProgressBarVisibility(true);
                setContentView(R.layout.main);

                //取得ProgressBar
                pro1 = (ProgressBar) findViewById(R.id.progress1);
                pro2= (ProgressBar) findViewById(R.id.progress2);
                btn = (Button)findViewById(R.id.button);
                //设置进度条是否自动运转，即设置其不确定模式，false表是不自动运转
                pro1.setIndeterminate(false);
                pro2.setIndeterminate(false);

                //当按钮按下时开始执行,
            btn.setOnClickListener(new Button.OnClickListener()
            {
              @Override
              public void onClick(View v)
              {
                // TODO Auto-generated method stub

                      //设置ProgressBar为可见状态
                      pro1.setVisibility(View.VISIBLE);
                      pro2.setVisibility(View.VISIBLE);
                      //设置ProgressBar的最大值
                      pro1.setMax(100);
                      //设置ProgressBar当前值
                      pro1.setProgress(0);
                      pro2.setProgress(0);

                      //通过线程来改变ProgressBar的值
                                new Thread(new Runnable() {
                                        public void run()
                                        {
                                                for (int i = 0; i < 10; i++)
                                                {
                                                        try
                                                        {
                                                                intCounter = (i + 1) * 20;
                                                                Thread.sleep(1000);

                                                                if (i == 4)
                                                                {
                                                                        Message m = new Message();

                                                                        m.what = ProgressBarTest.STOP_NOTIFIER;
                                                                        ProgressBarTest.this.myMessageHandler.sendMessage(m);
                                                                        break;
                                                                }
                                                                else
                                                                {
                                                                        Message m = new Message();
                                                                        m.what = ProgressBarTest.THREADING_NOTIFIER;
                                                                        ProgressBarTest.this.myMessageHandler.sendMessage(m);
                                                                }
                                                        }
                                                        catch (Exception e)
                                                        {
                                                                e.printStackTrace();
                                                        }
                                                }
                                        }
                                }).start();
                        }
                });
        }

          Handler myMessageHandler = new Handler()
          {
            // @Override
                  public void handleMessage(Message msg)
                  {
                          switch (msg.what)
                          {
                          //ProgressBar已经是对大值
                          case ProgressBarTest.STOP_NOTIFIER:
                                  pro1.setVisibility(View.GONE);
                                  pro2.setVisibility(View.GONE);
                                  Thread.currentThread().interrupt();
                                  break;
                          case ProgressBarTest.THREADING_NOTIFIER:
                                  if (!Thread.currentThread().isInterrupted())
                                  {
                                          // 改变ProgressBar的当前值
                                          pro1.setProgress(intCounter);
                                          pro2.setProgress(intCounter);

                                          // 设置标题栏中前景的一个进度条进度值
                                          setProgress(intCounter*100);
                                          // 设置标题栏中后面的一个进度条进度值
                                          setSecondaryProgress(intCounter*100);//
                                  }
                                  break;
                          }
                          super.handleMessage(msg);
                 }
          };
}

main.xml

<?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:text="进度条实例演示"  
    />  
<ProgressBar  
        android:id="@+id/progress1"  
        style="?android:attr/progressBarStyleHorizontal"---设置进度条为长条形  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:visibility="gone"---设置其不可见  
/>  
<ProgressBar  
        android:id="@+id/progress2"  
        style="?android:attr/progressBarStyleLarge"---设置进度条为圆形进度条  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:max="100"---设置其最大值  
        android:progress="50"---设置当前进度值  
        android:secondaryProgress="70"---设置次要进度值  
        android:visibility="gone"  
/>  
<Button  
        android:id="@+id/button"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="启动进度条"  
/>  
</LinearLayout>

The running results are as follows:

After clicking the start progress bar button, the progress bar will run automatically

When it ends, automatically exit the progress bar program and return to the first picture

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