步步为营_Android开发课[23]_用户界面之ProgressBar(进度条)

Focus on technology, enjoy life！—— QQ：804212028
浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305

• 主题：用户界面之ProgressBar(进度条)
  -
  自定义ProgressBar进度条（实例）：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout  
  xmlns:android="http://schemas.android.com/apk/res/android"  
  android:layout_width="fill_parent"  
  android:layout_height="fill_parent"  
  android:orientation="vertical">  
    <Button  
        android:id="@+id/button"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="开启ProgressBar"
    />  

    <ProgressBar  
        android:id="@+id/progressBar1"  
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:progress="0"
        android:visibility="gone" />

    <ProgressBar  
        android:id="@+id/progressBar2"  
        android:layout_width="fill_parent"  
         android:layout_height="10dip" 
         android:max="100" 
         android:progress="0"
         android:secondaryProgress="0"
         style="?android:attr/progressBarStyleHorizontal"  
         android:progressDrawable="@drawable/progressbar_layer_list"  
         android:background="@drawable/progressbar_box"
         android:visibility="gone"  
    />  
</LinearLayout>  

在res文件下创建drawable文件，再在drawable文件下创建progressbar_layer_list.xml。
progressbar_layer_list.xml：

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background">
        <clip>
            <shape>
                <corners android:radius="15dip" />
                <gradient android:startColor="#00b7ee" android:endColor="#0075a9" android:angle="270" android:centerY="0.75"/>
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <corners android:radius="15dip" />
                <gradient android:startColor="#00b7ee" android:endColor="#0075a9" android:angle="270" android:centerY="0.75"/>
            </shape>
        </clip>
    </item>

    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <gradient android:startColor="#00b7ee" android:endColor="#0075a9" android:angle="270" android:centerY="0.25"/>
                <corners android:radius="15dip"/>
            </shape>
        </clip>
    </item>
</layer-list>

progressbar_box图片资源如下：

MainActivity.java源代码：

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


    public class MainActivity extends Activity {
    private ProgressBar pro1,pro2;
    private Button button;
    private int count;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button)findViewById(R.id.button);
        pro1 = (ProgressBar)findViewById(R.id.progressBar1);
        pro2 = (ProgressBar)findViewById(R.id.progressBar2);
     // 设置进度条是否自动运转，false表是不自动运转
        pro1.setIndeterminate(false);
        pro2.setIndeterminate(false);

        button.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View arg0) {
                // 设置ProgressBar为可见状态
                pro1.setVisibility(View.VISIBLE);
                pro2.setVisibility(View.VISIBLE);

                // TODO Auto-generated method stub
                new Thread(new Runnable(){
                    public void run() {
                        for(int i=0; i<10; i++){
                            try{
                                count = i*10;
                                Thread.sleep(1000);
                                if(count >= 100){
                                    Message msg = new Message();
                                    msg.what = 1;
                                    MainActivity.this.myHandler.sendMessage(msg);
                                }else{
                                    Message msg = new Message();
                                    msg.what = 2;
                                    MainActivity.this.myHandler.sendMessage(msg);
                                }
                            }catch(Exception e){
                                e.printStackTrace();
                            }
                        }
                    }
                }).start();
            }

        });
    }    

    Handler myHandler = new Handler(){

        public void handleMessage(Message msg){
            switch(msg.what){
            case 1:

                Thread.currentThread().interrupt();
                break;
            case 2:
                if (!Thread.currentThread().isInterrupted()) {
                    // 改变ProgressBar的当前值
                    pro1.setProgress(count);
                    pro2.setProgress(count);
                    // 设置标题栏中前景的一个进度条进度值
                    //setProgress(count * 100);
                    // 设置标题栏中后面的一个进度条进度值
                    //setSecondaryProgress(count * 100);
                }
                break;
            }
            super.handleMessage(msg);
        }
    };  
}  

运行结果：

Focus on technology, enjoy life！—— QQ：804212028
浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305