主要代碼

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) {
//注冊一個系統 BroadcastReceiver， 作為訪問電池計量之用
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，
//就運行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時要運行的method
? ? public void onBatteryInfoReceiver(int intLevel, int intScale){
? ??//create跳出的對話窗口
? ??final Dialog d = new Dialog(Broadcast.this);
? ??d.setTitle(R.string.str_dialog_title);
? ??d.setContentView(R.layout.mydialog);
? ??
? ??//創建一個背景模糊的Window,且將對話窗口放在前景
? ??Window window = d.getWindow();
? ??window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,?
? ??WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
? ??
? ??//將取得的電池計量顯示與Dialog中
? ??TextView mTextView02 = (TextView) d.findViewById(R.id.myTextView2);
? ??mTextView02.setText(getResources().getText(R.string.str_dialog_body)?
? ??+ String.valueOf(intLevel * 100 / intScale) + "%");
? ??
? ??//設置返回主畫面的按鈕
? ??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();
? ? }
}

總結

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