Write CSV files onto SD Card Storage

add this permission in manifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

This example shows how to create a CSV file on removable storage in Android. CSV files are a convenient storage format for data to be easily viewed in programs like Excel or OpenOffice.

In this example, my goal is to create a CSV file having the following text:

--------------------------------------------- FirstParam SecondParam ThirdParam 0.31 5.2 7 0.31 5.2 7.1 0.31 5.2 7.2

Add this code to open a new file called "mydata.csv" on the SD card:

import java.io.File; import java.io.FileWriter; import java.io.IOException; import android.os.Environment; --------------------------------------------- FileWriter writer; File root = Environment.getExternalStorageDirectory(); File gpxfile = new File(root, "mydata.csv");

Use this routine to write the csv headers:

private void writeCsvHeader(String h1, String h2, String h3) throws IOException {    String line = String.format("%s,%s,%s\n", h1,h2,h3);    writer.write(line);  }

Use this routine to write CSV values to the file:

private void writeCsvData(float d, float e, float f) throws IOException {   String line = String.format("%f,%f,%f\n", d, e, f);   writer.write(line); }

Write the header and data lines like this:

try {         writer = new FileWriter(gpxfile);         writeCsvHeader("FirstParam","SecondParam","ThirdParam");         writeCsvData(0.31f,5.2f,7.0f);         writeCsvData(0.31f,5.2f,7.1f);         writeCsvData(0.31f,5.2f,7.2f); } catch (IOException e) {             e.printStackTrace(); }

Quick note: adding "f" to the end of the constant number above tells Java you explicitly want to pass the value as a float, instead of a double.

Don't forget to close the file:

writer.flush(); writer.close();

How to enable/disable bluetooth programmatically in android

Add the following permissions into your manifest file:

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

To Enable BLUETOOTH Use This Code.

//Enable bluetooth
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();    
if (!mBluetoothAdapter.isEnabled()) {
    mBluetoothAdapter.enable(); 
}else{Toast.makeText(getApplicationContext(), "Bluetooth Al-Ready Enable", Toast.LENGTH_LONG).show();} 
//Disable bluetooth
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();    
if (!mBluetoothAdapter.isEnabled()) {
    mBluetoothAdapter.disable(); 
}