Background Thread Running in Android

package com.raja.vedioapp;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity

{

@Override
protected void onCreate(Bundle savedInstanceState)

{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
         Progress();
}

protected void Progress()

{
final ProgressDialog progress=ProgressDialog.show(MainActivity.this, "Progress Task", "Please Wait....",true);

new Thread(){
public void run()
{
try
{
Message ms=new Message();
ms.what=1111;
handler.sendMessage(ms);
}catch (Exception e)
{
System.out.println("error "+e);
}
progress.cancel();
}
}.start();

}
Handler handler=new Handler()
{

@Override
public void handleMessage(Message msg)
{
switch(msg.what)
{
case 1111:
for(int i=0;i<1000;i++)
{
System.out.println("Back Ground Thread Test"+i);
}
break;
}
}
};

Progress Dialog showing when Back Ground Task Running in Android

package com.raja.vedioapp;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState)

{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new BackGround().execute("hi");
}
class BackGround extends AsyncTask<String, Void, String>
{
ProgressDialog progress;
@Override
protected String doInBackground(String... params)
{
for(int i=0;i<=10000;i++)
{
System.out.println("Background Task "+i);
}
return "success";
}

@Override
protected void onPostExecute(String result)
{
System.out.println("BackGround Task Completed Result is "+result);
progress.cancel();
}

@Override
protected void onPreExecute()
{
progress=ProgressDialog.show(MainActivity.this, "Progress", "Please Wait...",true);
}


}
}

Video recording in Android

public class Video extends Activity implements SurfaceHolder.Callback
{
private SurfaceHolder surfaceHolder;
private SurfaceView surfaceView;
public MediaRecorder mrec = new MediaRecorder();
File video;
private Camera mCamera;

@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_surface);
Log.i(null , "Video starting");
mCamera = Camera.open();
surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(0, 0, 0, "StartRecording");
menu.add(0, 1, 0, "StopRecording");
return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case 0:
try {
startRecording();
} catch (Exception e) {
String message = e.getMessage();
Log.i(null, "Problem Start"+message);
mrec.release();
}
break;

case 1: //GoToAllNotes
mrec.stop();
mrec.release();
mrec = null;
break;

default:
break;
}
return super.onOptionsItemSelected(item);
}

protected void startRecording() throws IOException
{
mrec = new MediaRecorder(); // Works well
mCamera.unlock();

mrec.setCamera(mCamera);

mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);

mrec.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setOutputFile("/sdcard/zzzz.3gp");

mrec.prepare();
mrec.start();
}

protected void stopRecording() {
mrec.stop();
mrec.release();
mCamera.release();
}

private void releaseMediaRecorder(){
if (mrec != null) {
mrec.reset(); // clear recorder configuration
mrec.release(); // release the recorder object
mrec = null;
mCamera.lock(); // lock camera for later use
}
}

private void releaseCamera(){
if (mCamera != null){
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
if (mCamera != null){
Parameters params = mCamera.getParameters();
mCamera.setParameters(params);
}
else {
Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
finish();
}
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mCamera.release();
}
}
camera_surface.xml

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<SurfaceView
android:id="@+id/surface_camera"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />

</RelativeLayout>

And of cource include these permission in manifest.

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

Audio Recording and playing in android

public void Audio()
{
final Intent audioIntent = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
File audioFile = new File(Environment.getExternalStorageDirectory(), "videoTest.mp4");
Uri audioFileUri = Uri.fromFile(audioFile);
audioIntent.putExtra(MediaStore.EXTRA_OUTPUT, audioFileUri);
startActivityForResult(audioIntent, TAKE_AUDIO);
}

Regular Expressions for Validations

Regular Expressions for Validations

^[0-9]$      it allows only numbers without any limit

^[0-9]{0,10}$   it allows only numbers up-to  minimum 0 to  maximum 10 digits

^[0-9]{1,10}$   it allows only numbers up-to  minimum 1 to  maximum 10 digits

^[0-9.]{0,10}$   it allows only numbers and decimal numbers also up-to  minimum 1 to  maximum 10 digits

^[+]?\\d+(\\.{0,1}(\\d{0,3})\\%{0,1})?$   it allows +ve numbers only and also

 

^     allows(caret)

[]    specific numbers are symbols you want allow  like [0-9] it allows 0 to 9 all numbers

{}  specific limit for # chars appears in string {Min,Max}={0,1} means  in given String # may appears once or not appears

\\ this like OR condition

Count Char Occurrences in Java

public static int count_Chars(String given, char key)
{
    int count = 0;
    for (int i=0; i < given.length(); i++)
    {
        if (given.charAt(i) == key)
        {
             count++;
        }
    }
    return count;
}

Start/Stop GPS Programmatically in Android

private void setGPSOn()
{
    String provider = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);

    if(!provider.contains("gps"))
     { 
        //if gps is disabled
        final Intent poke = new Intent();
        poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider"); 
        poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
        poke.setData(Uri.parse("3")); 
        sendBroadcast(poke);
    }
}

private void setGPSOff(){
    String provider = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);

    if(provider.contains("gps"))
    {
        //if gps is enabled
        final Intent poke = new Intent();
        poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider");
        poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
        poke.setData(Uri.parse("3")); 
        sendBroadcast(poke);
    }
}