Battery Indicator

Main Activity :-- 

public class MainActivity extends Activity {

ProgressBar pb;

TextView tv;

private BroadcastReceiver br=new BroadcastReceiver(){

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

pb=(ProgressBar)findViewById(R.id.progressBar1);

tv=(TextView)findViewById(R.id.textView1);

int i=intent.getIntExtra("level", 0);

pb.setProgress(i);

tv.setText("Battery is "+Integer.toString(i)+" %");

}

};

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        registerReceiver(br,new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

        

        

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.activity_main, menu);

        return true;

    }

}

Battery Indicator Activity:-- 

public class BatteryIndicatorActivity extends Activity {

private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context c, Intent i) {

int level = i.getIntExtra("level", 0);

ProgressBar pb = (ProgressBar) findViewById(R.id.progressbar);

pb.setProgress(level);

TextView tv = (TextView) findViewById(R.id.textfield);

tv.setText("Battery Level: " + Integer.toString(level) + "%");

}

};

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

registerReceiver(mBatInfoReceiver, new IntentFilter(

Intent.ACTION_BATTERY_CHANGED));

}

}

Android Manifest :-- 

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.android"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="10"

        android:targetSdkVersion="15" />

    <application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".BatteryIndicatorActivity"

            android:label="@string/title_activity_main" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Activity Main .xml:-- 

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent" 

        android:orientation="vertical">

        <TextView

            android:id="@+id/textView1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Large Text"

            android:textAppearance="?android:attr/textAppearanceLarge" />

        <ProgressBar

            android:id="@+id/progressBar1"

            style="?android:attr/progressBarStyleHorizontal"

            android:layout_width="266dp"

            android:layout_height="wrap_content"

            android:layout_marginTop="30dp"

            android:layout_marginLeft="10dp" />

    </LinearLayout>