android中的broadcastReceiver

主要代码

package com.bro;


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.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;


public class Broadcast extends Activity {

private int intLevel;
private int intScale;
private Button mButton01;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mButton01 = (Button) findViewById(R.id.myButton1);
        mButton01.setOnClickListener(new Button.OnClickListener(){


@Override
public void onClick(View v) {
//注册一个系统 BroadcastReceiver， 作为访问电池计量之用
registerReceiver(batInfoReceiver, new IntentFilter(
Intent.ACTION_BATTERY_CHANGED));
}
        
        });
    }
    
    private BroadcastReceiver batInfoReceiver = new BroadcastReceiver(){


@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
//如果捕捉到的action是ACTION_BATTERY_CHANGED，
//就运行onBatteryInfoReceiver()
if(Intent.ACTION_BATTERY_CHANGED.equals(action)){
intLevel = intent.getIntExtra("level", 0);
intScale = intent.getIntExtra("scale", 100);
onBatteryInfoReceiver(intLevel,intScale);
}
}
    
    };
    
    //捕捉到ACTION_BATTERY_CHANGED时要运行的method
    public void onBatteryInfoReceiver(int intLevel, int intScale){
    //create跳出的对话窗口
    final Dialog d = new Dialog(Broadcast.this);
    d.setTitle(R.string.str_dialog_title);
    d.setContentView(R.layout.mydialog);
    
    //创建一个背景模糊的Window,且将对话窗口放在前景
    Window window = d.getWindow();
    window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND, 
    WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
    
    //将取得的电池计量显示与Dialog中
    TextView mTextView02 = (TextView) d.findViewById(R.id.myTextView2);
    mTextView02.setText(getResources().getText(R.string.str_dialog_body) 
    + String.valueOf(intLevel * 100 / intScale) + "%");
    
    //设置返回主画面的按钮
    Button mButton02 = (Button) d.findViewById(R.id.myButton2);
    mButton02.setOnClickListener(new Button.OnClickListener(){


@Override
public void onClick(View v) {
unregisterReceiver(batInfoReceiver);
d.dismiss();
}
    
    });
    d.show();
    }
}