This is a simple and powerful bluetooth app.Using this you can turn_on bluetooth,start discoverable with a simple touch,even turn_off your bluetooth.This will not work on emulator since bluetooth support is not added.
if (mBluetoothAdapter == null) {
out.append("device not supported"); this conditions checks for bluetooth device.If no hardware devices are founding in the device . It displays device not found [Note:This especially happens in android emulator, because there is no support for bluetooth hardware in android emulator]. if (!mBluetoothAdapter.isEnabled()) { when button turn_on is clicked this method will request the bluetooth adapter to enable bluetooth then the activity gets started .
if (!mBluetoothAdapter.isDiscovering()) {
Context context = getApplicationContext();This returns context for the entire application. We can also use this instead of the current Activity context. If user needs a context tied to the life cycle of the entire application,not just for the current activity.
context.Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(enableBtIntent, REQUEST_DISCOVERABLE_BT); This method instantiate bluetooth discover able .We can also set the time for turning on discover able.
mBluetoothAdapter.disable();This method will turn off the bluetooth and exists the application.
Xml code
<RelativeLayout 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:background="@drawable/ic_launcher"
tools:context=".MainActivity" >
The Android compiler considers everything inside the relative layout tag to be a parameter or a customization option until it reaches a closing tag(/>).
android:layout_width="wrap_content"
The wrap_content parameter tiles the content. The layout used for this program is relative layout.
Manifest.xml
In manifest file these to permission’s has to be added in order to start the activity without any crash.
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />Java source code
package com.example.bluetooth;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final int REQUEST_ENABLE_BT = 0;
private static final int REQUEST_DISCOVERABLE_BT = 0; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView out=(TextView)findViewById(R.id.out);
final Button button = (Button) findViewById(R.id.button1);
final Button button1 = (Button) findViewById(R.id.button2);
final Button button2 = (Button) findViewById(R.id.button3);
final BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
out.append("device not supported");
}
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}
});
button1.setOnClickListener(new View.OnClickListener() @Override
public void onClick(View arg0) {
if (!mBluetoothAdapter.isDiscovering()) {
// out.append("MAKING YOUR DEVICE DISCOVERABLE");
Context context = getApplicationContext();
CharSequence text = "MAKING YOUR DEVICE DISCOVERABLE";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(enableBtIntent, REQUEST_DISCOVERABLE_BT);
}
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
mBluetoothAdapter.disable();
Context context = getApplicationContext();
CharSequence text = "TURNING_OFF BLUETOOTH";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, text, 15);
toast.show();
}
});
}
}
Xml code
<RelativeLayout 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:background="@drawable/ic_launcher"
tools:context=".MainActivity" >
<TextView android:text="" android:id="@+id/out" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="30dp"
android:layout_marginTop="49dp"
android:text="TURN_ON" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="27dp"
android:text="DISCOVERABLE" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2"
android:layout_marginTop="28dp"
android:text="TURN_OFF" />
</RelativeLayout>
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.example.bluetooth"
android:versionCode="1"
android:versionName="1.0" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.bluetooth.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
