Android 中带有进度条效果的按钮（Button）

安卓中带有进度条效果的按钮，如下图：

1.布局文件如下activity_main.xml

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     xmlns:tools="http://schemas.android.com/tools" 3     android:layout_width="fill_parent" 4     android:layout_height="fill_parent" 5     android:paddingBottom="@dimen/activity_vertical_margin" 6     android:paddingLeft="@dimen/activity_horizontal_margin" 7     android:paddingRight="@dimen/activity_horizontal_margin" 8     android:paddingTop="@dimen/activity_vertical_margin" 9     tools:context=".MainActivity" >10 11     <TextView 12         android:id="@+id/text"13         android:layout_width="wrap_content"14         android:layout_height="wrap_content"15         android:text="带有进度条的Button" />16 17     <RelativeLayout 18         android:layout_width="fill_parent"19         android:layout_height="50dp"20         android:layout_centerHorizontal="true"21         android:layout_centerVertical="true"22         android:gravity="bottom" >23 24         <ProgressBar 25             android:id="@+id/progressBar"26             style="?android:attr/progressBarStyleHorizontal"27             android:layout_width="fill_parent"28             android:layout_height="fill_parent"29             android:background="@drawable/aa_button_gray_normal"30             android:max="100"31             android:progress="0"32             android:progressDrawable="@drawable/progress_selector" />33 34         <Button 35             android:id="@+id/downLoadBtn"36             android:layout_width="fill_parent"37             android:layout_height="fill_parent"38             android:layout_centerHorizontal="true"39             android:layout_centerVertical="true"40             android:background="@drawable/btn_selector"41             android:text="下载" />42     </RelativeLayout>43 44 </RelativeLayout>

2.java主界面代码如下：MainActivity.java

 1 package com.example.buttondemo;  2  3 import android.app.Activity;  4 import android.os.Bundle;  5 import android.os.Handler;  6 import android.os.Message;  7 import android.view.View;  8 import android.widget.Button;  9 import android.widget.ProgressBar; 10 import android.widget.TextView; 11 12 public class MainActivity extends Activity { 13     int i = 0; 14     ProgressBar progressBar = null; 15     Button downLoadBtn = null; 16     Handler handler = new Handler() { 17         public void handleMessage(android.os.Message msg) { 18             switch (msg.what) { 19             case 1: 20                 i += 5; 21  progressBar.setProgress(i); 22                 if (i != 100) { 23                     handler.sendEmptyMessageDelayed(new Message().what = 1, 500); 24                     downLoadBtn.setText(i + "%"); 25                 } else if (i == 100) { 26                     downLoadBtn.setText("下载完成"); 27                     // 进度条运行完成时按钮可用28                     downLoadBtn.setEnabled(true); 29  } 30                 break; 31 32             default: 33                 break; 34  } 35  }; 36  }; 37 38  @Override 39     protected void onCreate(Bundle savedInstanceState) { 40         super.onCreate(savedInstanceState); 41  setContentView(R.layout.activity_main); 42         TextView tx = (TextView) findViewById(R.id.text); 43         progressBar = (ProgressBar) findViewById(R.id.progressBar); 44         downLoadBtn = (Button) findViewById(R.id.downLoadBtn); 45         downLoadBtn.setOnClickListener(new View.OnClickListener() { 46 47  @Override 48             public void onClick(View v) { 49                 i = 0; 50                 handler.sendEmptyMessage(new Message().what = 1); 51                 // 进度条运行时按钮不可用52                 downLoadBtn.setEnabled(false); 53  } 54  }); 55  } 56 57 }

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