Android根据电量变化为不同图片的方法【电池电量提示】

1 主类

package com.jli.battery;

import android.app.Activity;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.IBinder;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class Main extends Activity {

private ImageView tvBatteryChanged;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvBatteryChanged = (ImageView)findViewById(R.id.test);
//注册一个接受广播类型
registerReceiver(new BatteryBroadcastReceiver(), new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}

/**接受电量改变广播*/
class BatteryBroadcastReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {

if(intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)){

int level = intent.getIntExtra("level", 0);
int scale = intent.getIntExtra("scale", 100);
int curPower = (level * 100 / scale)/25;
switch (curPower) {
case 0:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power0));
break;
case 1:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power1));
break;
case 2:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power2));
break;
case 3:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power3));
break;
case 4:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power4));
break;
}
}
}

}

}

2 xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView
android:id="@+id/test"
android:src="@drawable/power4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

3 然后记得要加上这句，这个应该是注册电池广播的，如果不加的话会报错，放在Manifest.xml这个文件里面<service android:name="ElectActivity$BatteryUpDateService"/>
4 效果图【其实代码很好理解的，都不用怎么仔细看的】