1. <string name="battery_level">Battery level:</string>
   

   　　

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"android:layout_height="match_parent"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:paddingBottom="@dimen/activity_vertical_margin"android:orientation="vertical"tools:context=".MainActivity"><TextViewandroid:id="@+id/textView"android:text="@string/battery_level"android:layout_width="wrap_content"android:layout_height="wrap_content" /><ProgressBarandroid:id="@+id/progressBar"style="?android:attr/progressBarStyleHorizontal"android:layout_marginTop="8dp"android:layout_marginLeft="12dp"android:layout_marginRight="12dp"android:max="100"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_below="@+id/textView"android:layout_toRightOf="@+id/textView"android:layout_toEndOf="@+id/textView" /></LinearLayout>

创建一个内部类为我们的广播实现

private class BatteryBroadcastReceiver extends BroadcastReceiver {private final static String BATTERY_LEVEL = "level";@Overridepublic void onReceive(Context context, Intent intent) {int level = intent.getIntExtra(BATTERY_LEVEL, 0);mBatteryLevelText.setText(getString(R.string.battery_level) + " " + level);mBatteryLevelProgress.setProgress(level);}
}

public class MainActivity extends Activity {private TextView mBatteryLevelText;private ProgressBar mBatteryLevelProgress;private BroadcastReceiver mReceiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mBatteryLevelText = (TextView) findViewById(R.id.textView);mBatteryLevelProgress = (ProgressBar) findViewById(R.id.progressBar);mReceiver = new BatteryBroadcastReceiver();registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));}@Overrideprotected void onStop() {unregisterReceiver(mReceiver);super.onStop();}private class BatteryBroadcastReceiver extends BroadcastReceiver {private final static String BATTERY_LEVEL = "level";@Overridepublic void onReceive(Context context, Intent intent) {int level = intent.getIntExtra(BATTERY_LEVEL, 0);mBatteryLevelText.setText(getString(R.string.battery_level) + " " + level);mBatteryLevelProgress.setProgress(level);}}
}

We can register receiver in AndroidManifest.xml:<receiver android:name="BatteryBroadcastReceiver" >
<intent-filter>
<action android:name="android.intent.action.BATTERY_CHANGED" />
</intent-filter>
</receiver>

or register our BroadcastReceiver in application
BatteryBroadcastReceiver mReceiver = new BatteryBroadcastReceiver();
registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

1. telnet localhost <PORT>

1. power capacity <BATTERY_LEVEL_IN_PERCENT>