Android查看电池电量的方法(基于BroadcastReceiver)

import android.app.Activity;
import android.app.Dialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
public class A02Activity extends Activity {
 private int level;
 private int scale;
 private Button b01;
 private BroadcastReceiver mBatInfoReceiver=new BroadcastReceiver(){
 @Override
 public void onReceive(Context context, Intent intent) {
  // TODO Auto-generated method stub
  String action=intent.getAction();
//如果捕捉到的是ACTION_BATTERY_CHANGED就运行onBatteryInfoReceiver();将电量显示于新窗口中
  if(Intent.ACTION_BATTERY_CHANGED.equals(action)){
  level=intent.getIntExtra("level", 0);
  scale=intent.getIntExtra("scale", 100);
  onBatteryInfoReceiver(level,scale);
  }
 }
 };
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    b01=(Button)findViewById(R.id.button01);
    b01.setBackgroundColor(Color.GREEN);
    b01.setText("查看电量");
    b01.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  // TODO Auto-generated method stub
  registerReceiver(mBatInfoReceiver,new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
  }
    });
  }
  public void onBatteryInfoReceiver(int intLevel,int intScale){
   final Dialog d=new Dialog(A02Activity.this);
   d.setTitle(R.string.str_title);
   d.setContentView(R.layout.dialog);
   Window window=d.getWindow();
   window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND, WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
   TextView mTextView02=(TextView)d.findViewById(R.id.myTextView02);
   //取得电池电量显示于Dialog中
   mTextView02.setText(getResources().getText(R.string.str_body)+String.valueOf(intLevel*100/intScale)+"%");
   Button b02=(Button)d.findViewById(R.id.button02);
   b02.setBackgroundColor(Color.RED);
   b02.setText("返回");
   b02.setTextColor(Color.YELLOW);
   b02.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  // 反注册Receiver并关闭窗口
  unregisterReceiver(mBatInfoReceiver);
  d.dismiss();
  }
   });
   d.show();
  }
}

public void onReceiver(Context context,Intent intent){
   String action=intent.getAction();
   if(Intent.ACTION_BATTERY_CHANGED.equals(action)){
      /*运行程序的代码*/
   }
}

final Dialog d=new Dialog(A02Activity.this);
d.setTitle(R.string.str_title);
d.setContentView(R.layout.dialog);
Window window=d.getWindow();
window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND, WindowManager.LayoutParams.FLAG_BLUR_BEHIND);