hi everybody i want to make an android app for controling bluetooth module
hc-05,i have the following code in android studio:
MainActivity.java
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package com.example.shsmszdh.blue1;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
public class MainActivity extends Activity {
Button b1,b2,b3,b4;
private BluetoothAdapter BA;
private Set<BluetoothDevice>pairedDevices;
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button);
b2=(Button)findViewById(R.id.button2);
b3=(Button)findViewById(R.id.button3);
b4=(Button)findViewById(R.id.button4);
BA = BluetoothAdapter.getDefaultAdapter();
lv = (ListView)findViewById(R.id.listView);
}
public void on(View v){
if (!BA.isEnabled()) {
Intent turnOn = new
Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOn, 0);
Toast.makeText(getApplicationContext(),"Turned
on",Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(),"Already on",
Toast.LENGTH_LONG).show();
}
}
public void off(View v){
BA.disable();
Toast.makeText(getApplicationContext(),"Turned off"
,Toast.LENGTH_LONG).show();
}
public void visible(View v){
Intent getVisible = new
Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(getVisible, 0);
}
public void list(View v){
pairedDevices = BA.getBondedDevices();
ArrayList list = new ArrayList();
for(BluetoothDevice bt : pairedDevices)
list.add(bt.getName());
Toast.makeText(getApplicationContext(),"Showing Paired
Devices",Toast.LENGTH_SHORT).show();
final ArrayAdapter adapter = new
ArrayAdapter(this,android.R.layout.simple_list_item_1, list);
lv.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is
present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
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activity_main.xml
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<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:transitionGroup="true">
<TextView
android:text="bluetooth_example" android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textview"
android:textSize="35sp"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Turn On"
android:id="@+id/button"
android:clickable="true"
android:onClick="on"
android:layout_alignParentStart="true"
android:layout_below="@+id/textview" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get visible"
android:onClick="visible"
android:id="@+id/button2"
android:layout_above="@+id/textView2"
android:layout_alignStart="@+id/button3" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="List devices"
android:onClick="list"
android:id="@+id/button3"
android:layout_above="@+id/listView"
android:layout_alignEnd="@+id/listView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="turn off"
android:onClick="off"
android:id="@+id/button4"
android:layout_alignTop="@+id/button"
android:layout_centerHorizontal="true" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/listView"
android:layout_below="@+id/textView2"
android:layout_alignParentStart="true"
android:layout_marginTop="45dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Paired devices:"
android:id="@+id/textView2"
android:textColor="#ff34ff06"
android:textSize="25dp"
android:layout_below="@+id/button"
android:layout_alignParentStart="true"
android:layout_marginTop="37dp" />
</RelativeLayout>
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AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android";
package="com.example.shsmszdh.blue1">
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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>
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and when i select run i see this error:
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Error:Execution failed for task ':app:mergeDebugResources'.
> [drawable/abc]
E:\DriveC\summer95\project\AndroidStudio_Project\Blue1\app\src\main\res\drawable\abc.png
[drawable/abc]
E:\DriveC\summer95\project\AndroidStudio_Project\Blue1\app\src\main\res\values\refs.xml:
Error: Duplicate resources
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it seems that coulde not make r.java file because R symbol in
MainActivity.java file is red and says:cannot resolvs symbol R
please say me exactly what should i do,i am new in android programming ,i
need your help!!!!!!!!!!!!!!!
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