ProgressBar进度条的使用

    ProgressBar提供了可以向用户展示当前任务的进度。下面介绍一下各种进度条的使用。

一、建立工程，如图

二、activity_main.xml中代码

<?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="wrap_content"
        android:layout_height="wrap_content"
        android:text="小圆形进度条"
        />
    <ProgressBar 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleSmallTitle"
        />
    
        <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="中型圆形进度条"
        />
    <ProgressBar 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    
        <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="大型圆形进度条"
        />
    <ProgressBar 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleLarge"
        />
        <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="水平进度条"
        />
    <ProgressBar 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"
        android:progress="30"
        />
     <ProgressBar 
        android:id="@+id/progressbar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"
        android:progress="30"
        android:secondaryProgress="60"
        android:layout_marginTop="20dp"
        />
     <LinearLayout 
        android:orientation="horizontal" 
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        
         <Button 
             android:id="@+id/button1"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="增加进度"
             android:layout_marginTop="20dp"
             />
         <Button 
             android:id="@+id/button2"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="减小进度"
             android:layout_marginTop="20dp"
             />
         
        </LinearLayout>
    
</LinearLayout>

三、MainActivity.java中代码

package com.study.progressbar;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends Activity implements OnClickListener{

    private ProgressBar progressBar;
    private Button button1,button2;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        //如何设置窗口有刻度的效果
        requestWindowFeature(Window.FEATURE_PROGRESS);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_main);
        
        progressBar = (ProgressBar)this.findViewById(R.id.progressbar);
        
        setProgressBarVisibility(true);
        setProgressBarIndeterminate(true);
        setProgress(3500);
        
        button1 = (Button)this.findViewById(R.id.button1);
        button2 = (Button)this.findViewById(R.id.button2);
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
    }


    @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;
    }


    @Override
    public void onClick(View v) {
         switch (v.getId()) {
        case R.id.button1:
            progressBar.setProgress((int)(progressBar.getProgress()*1.2));
            progressBar.setSecondaryProgress((int)(progressBar.getProgress()*1.2));
            break;
        case R.id.button2:
            progressBar.setProgress((int)(progressBar.getProgress()*0.8));
            progressBar.setSecondaryProgress((int)(progressBar.getProgress()*0.8));
            break;
        default:
            break;
        }
        
    }
    
}

四、效果图