ProgressBar与Handler的整合应用

 在android中进度条使用ProgressBar表示，用于向用户显示某个耗时操作完成的百分比     之ProgressBar与Handler的整合应用

1.在xml文件中通过<ProgressBar>标记添加，表示基本如下：

<ProgressBar        
android:id="@+id/progressBar1"        
  style="?android:attr/progressBarStyleHorizontal"        
  android:layout_width="fill_parent"       
  android:layout_height="wrap_content" />

部分xml属性如下：

android:max-->设置进度条的最大值
android:progress-->指定进度条已经完成的进度值
android:progressDrawable-->设置进度条轨道的绘制形式

关于progressBar的style

style="?android:attr/progressBarStyleHorizontal"    细长水平进度条
style="?android:attr/progressBarStyleLarge"         大原型水平进度条

 setIndeterminate  设置indeterminate为false 滚动条告知自己正在忙碌，若为true，则可以根据进度设置进度值

代码如下

activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    
tools:context=".MainActivity" >    
<TextView       
 android:id="@+id/tv1"        
android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    
<ProgressBar       
 android:id="@+id/pb"        
android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/tv1"        
android:visibility="gone" />    
<Button        
android:id="@+id/btn"       
 android:layout_width="wrap_content"        android:layout_height="wrap_content"        
android:text="点击"       
 android:layout_below="@id/pb" />
</RelativeLayout>

MainActivity.java
public class MainActivity extends Activity {    
private TextView tv1;    private ProgressBar pb;    
private Button btn;    
private int count;
@Override    
protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                
tv1 = (TextView) findViewById(R.id.tv1);        
pb = (ProgressBar) findViewById(R.id.pb);        
btn = (Button) findViewById(R.id.btn);        
//调用setIndeterminate设置indeterminate为false 滚动条告知自己正在忙碌，若为true，则可以根据进度设置进度值        pb.setIndeterminate(false);                btn.setOnClickListener(new View.OnClickListener() {                        
@Override            
public void onClick(View v) {                
//点击按钮，ProgressBar显示                pb.setVisibility(View.VISIBLE);                
//指定ProgressBar最大值为100                pb.setMax(100);                
//指定初始值为0                pb.setProgress(0);                                
//开启线程，更改ProgressBar的值                
new Thread (new Runnable() {                                                                                
@Override                    
public void run() {                        
for (int i = 0; i < 10; i++) {                            
try {                                
count = (i + 1)*20;                                
Thread.sleep(1000);                                
//线程运行5秒后结束                                
if (i == 4) {                                   
 Message msg = new Message();                                    
msg.what = 0;                                   
 handle.sendMessage(msg);                                   
 break;                                
}else{                                    
Message msg = new Message();                                    
msg.what = 1;                                    

handle.sendMessage(msg);                                
}                            
} catch (Exception e) {                           
 }                        
}                    
}                
}).start();            
}        
});            
}        
Handler handle = new Handler(){        
public void handleMessage(Message msg) {            
switch (msg.what) {            
case 0:                
tv1.setText("数据加载完毕");                
//设置ProgressBar隐藏               
 pb.setVisibility(View.GONE);                
//线程中断                

Thread.currentThread().interrupt();               
 break;            
case 1:                
if (!Thread.currentThread().interrupted()) {                    
pb.setProgress(count);                    
//将进度显示在setText中                    
tv1.setText("==================");                

}                
break;            
default:                
break;            
}        
};    
};

 下载：https://github.com/SamSarah1/AndroidDemo