android显示手机电量

package com.basillee.asus.demo;



import android.app.Notification;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.BatteryManager;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;





public class MainActivity11 extends ActionBarActivity {



    private TextView textViewLevel=null;

    private int batteryLevel;

    private int batteryScale;

    private Button buttonBatteryShow;

    private BroadcastReceiver broadcastReceiver=new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            //获取当前电量，如未获取具体数值，则默认为0

            batteryLevel=intent.getIntExtra(BatteryManager.EXTRA_LEVEL,0);

            //获取最大电量，如未获取到具体数值，则默认为100

            batteryScale=intent.getIntExtra(BatteryManager.EXTRA_SCALE,100);

            //显示电量

            textViewLevel.setText("电量"+(batteryLevel*100/batteryScale)+"%");

        }

    };

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_activity11);

        textViewLevel= (TextView) findViewById(R.id.textViewBattery);

        buttonBatteryShow= (Button) findViewById(R.id.button_show_battery);

        buttonBatteryShow.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                IntentFilter intentFilter=new IntentFilter(Intent.ACTION_BATTERY_CHANGED);

                //注册接收器以获取电量信息

                registerReceiver(broadcastReceiver, intentFilter);

            }

        });

    }



}

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