Call non Activity class from Activity Android :

Step 1 :

Create class

public class Destination{

private Activity activity;

Public Destination(Activity _activity){

this.activity = _activity;

}

}

Step 2 :

Call Destination.java class

new Destination(Destination.this);

Android error: Failed to install *.apk on device *: timeout

Try changing the ADB connection timeout. I think it defaults that to 5000ms and I changed mine to 10000ms to get rid of that problem.

If you are in Eclipse, you can do this by going through

ADT -> Preferences -> Android -> DDMS -> ADB Connection Timeout (ms)

Android Customize Video capture

public class RecentVideo extends Activity implements SurfaceHolder.Callback {

     private Button startRecording = null;
        private Button stopRecording = null;
    MediaRecorder recorder;
    SurfaceHolder holder;
    boolean recording = false;   
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

        recorder = new MediaRecorder();
        initRecorder();
        setContentView(R.layout.try_video);
       
       
         startRecording = (Button)findViewById(R.id.buttonstart);
         stopRecording =(Button)findViewById(R.id.buttonstop);
       
        SurfaceView cameraView = (SurfaceView) findViewById(R.id.surface_camera);
        holder = cameraView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
       
        cameraView.setClickable(true);
       
        initGUI();
   
       
    }
   
     private void initGUI() {
            startRecording.setOnClickListener(new OnClickListener() {
               
                @Override
                public void onClick(View arg0) {
                    Log.d("**************", "started");
//                     initRecorder();
                   
//                    if(!recording){
//                        initRecorder();
//                     prepareRecorder();
                   
                     recording = true;
                     recorder.start();
//                    }
                    /* if (recording) {
                            recorder.stop();
                            recording = false;

                            // Let's initRecorder so we can record again
                            initRecorder();
                            prepareRecorder();
                        } else {
                            recording = true;
                            recorder.start();
                        }*/
                }
            });
           
      stopRecording.setOnClickListener(new OnClickListener() {
       
        @Override
        public void onClick(View arg0) {
             recorder.stop();
             recording = false;
             //initRecorder();
               // prepareRecorder();
        }
    }) ;
      
     }
    @SuppressLint("SdCardPath") private void initRecorder() {
         recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
         recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);

            CamcorderProfile cpHigh = CamcorderProfile
                    .get(CamcorderProfile.QUALITY_LOW);
            recorder.setProfile(cpHigh);
//            String file = Environment.getDataDirectory()+"/videocapture_example.mp4";
//            File f = new File(file);
//            if (!f.isFile()){
//                try {
//                    f.createNewFile();
//                } catch (IOException e) {
//                    // TODO Auto-generated catch block
//                    e.printStackTrace();
//                }
//            }
            recorder.setOutputFile("/sdcard/videocapture_example.mp4");
            recorder.setMaxDuration(50000); // 50 seconds
//            recorder.setMaxFileSize(5000000); // Approximately 5 megabytes
       
    }

     private void prepareRecorder() {
            recorder.setPreviewDisplay(holder.getSurface());

            try {
                recorder.prepare();
            } catch (IllegalStateException e) {
                e.printStackTrace();
                finish();
            } catch (IOException e) {
                e.printStackTrace();
                finish();
            }
        }
   
    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub
       
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
         prepareRecorder();
       
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
       
    }

}


this activity can be called the necessary button

Download zip file using HTTPPOST in Android :

Step 1 :

Create an Asybktask

new save().execute();

Step 2:

In Asynktask

public class save extends AsyncTask<String, Integer, byte[]> {
 @Override
 protected void onPostExecute(byte[] result) {
 super.onPostExecute(result);
}
byte[] data;
@Override
protected byte[] doInBackground(String... arg0) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
try {
 MultipartEntity entity = new MultipartEntity();

//Add required post data 
entity.addPart("id", new StringBody("1"));
 entity.addPart("api_key", new StringBody("key"));
 entity.addPart("api_password", new StringBody("password"));

//Execute post method
 httppost.setEntity(entity);

//Read the response
 HttpResponse response = httpclient.execute(httppost);
 InputStream input = response.getEntity().getContent();
 data = new byte[input.available()];
 input.read(data);
 File path = new File(Environment.getExternalStorageDirectory()+"/asdfg.zip");
 if (!path.isFile()){
 path.createNewFile();
 }
 OutputStream outputStream = 
 new FileOutputStream(path);
 
 int read = 0;
 byte[] bytes = new byte[1024];
 
 while ((read = input.read(bytes)) != -1) {
 outputStream.write(bytes, 0, read);
 }
 } catch (ClientProtocolException e) {
 } catch (IOException e) {
 }
 return data;
 }
}

Execute SQL file into sqlite for Android:

Step 1 :

Copy and past your sql file into raw folder
src -> res -> raw -> yoursql

Note : Remove the extension e.g use yoursql only instead ofyoursql.sql

Step 2 :

In DataBaseHelper class :

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;

public class DataBaseHelper extends SQLiteOpenHelper{
 
 //The Android's default system path of your application database.
 private static final String DB_PATH = "/data/data/com.example.name/databases/";
 
 private static final String DB_NAME = "yoursqlite.sqlite";
 
 private SQLiteDatabase myDataBase; 
 
 private final Context myContext;
 
 /**
 * Constructor
 * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
 * @param context
 */
 public DataBaseHelper(Context context) {
 
 super(context, DB_NAME, null, 1);
 this.myContext = context;
 } 
 
 /**
 * Creates a empty database on the system and rewrites it with your own database.
 * */
 public void createDataBase() throws IOException{
 
 boolean dbExist = checkDataBase();
 
 if(dbExist){
 //do nothing - database already exist
 
 }else{
 
 //By calling this method and empty database will be created into the default system path
 //of your application so we are gonna be able to overwrite that database with our database.
 this.getReadableDatabase();
 
 try {
 
 copyDataBase();
 
 } catch (IOException e) {
 
 throw new Error("Error copying database");
 
 }
 }
 
 }
 /**
 * This reads a file from the given Resource-Id and calls every line of it as a SQL-Statement
 * 
 * @param context
 * 
 * @param resourceId
 * e.g. R.raw.food_db
 * 
 * @return Number of SQL-Statements run
 * @throws IOException
 */
 public int insertFromFile(Context context, int resourceId) throws IOException {
 // Reseting Counter
 int result = 0;
// Open the resource
 InputStream insertsStream = context.getResources().openRawResource(resourceId);
 BufferedReader insertReader = new BufferedReader(new InputStreamReader(insertsStream));
// Iterate through lines (assuming each insert has its own line and theres no other stuff)
 while (insertReader.ready()) {
 String insertStmt = insertReader.readLine();
 myDataBase.execSQL(insertStmt);
 result++;
 }
 insertReader.close();
// returning number of inserted rows
 return result;
 }
 /**
 * Check if the database already exist to avoid re-copying the file each time you open the application.
 * @return true if it exists, false if it doesn't
 */
 public boolean checkDataBase(){
 
 SQLiteDatabase checkDB = null;
 
 try{
 String myPath = DB_PATH + DB_NAME;
 checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
 
 }catch(SQLiteException e){
 
 //database does't exist yet.
 return false;
 }
 
 if(checkDB != null){
 
 checkDB.close();
 
 }
 
 return checkDB != null ? true : false;
 }
 
 /**
 * Copies your database from your local assets-folder to the just created empty database in the
 * system folder, from where it can be accessed and handled.
 * This is done by transfering bytestream.
 * */
 private void copyDataBase() throws IOException{
 
 //Open your local db as the input stream
 InputStream myInput = myContext.getAssets().open(DB_NAME);
 
 // Path to the just created empty db
 String outFileName = DB_PATH + DB_NAME;
 
 //Open the empty db as the output stream
 OutputStream myOutput = new FileOutputStream(outFileName);
 
 //transfer bytes from the inputfile to the outputfile
 byte[] buffer = new byte[1024];
 int length;
 while ((length = myInput.read(buffer))>0){
 myOutput.write(buffer, 0, length);
 }
 
 //Close the streams
 myOutput.flush();
 myOutput.close();
 myInput.close();
 
 }
 
 public SQLiteDatabase openDataBase() throws SQLException{
 
 //Open the database
 String myPath = DB_PATH + DB_NAME;
 try
 {
 myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
 }
 catch(Exception e)
 {
 //if it reaches here then the db is missing which means this a first run 
 return null;
 }
 return myDataBase;
 }
 
 @Override
 public synchronized void close() {
 
 if(myDataBase != null)
 myDataBase.close();
 
 super.close();
 
 }
 
 @Override
 public void onCreate(SQLiteDatabase db) {
 
 }
 
 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 
 }
 
 // Add your public helper methods to access and get content from the database.
 // You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
 // to you to create adapters for your views.
 
}

step 3 :

Where you want to read the sql file paste the following

DataBaseHelper myDbHelper ;

try{
 int count_of_query = myDbHelper.insertFromFile(getApplicationContext(), R.raw.yoursql);
 Log.e("count_of_query", count_of_query +"");
 }catch(Exception e){
 e.printStackTrace();
 }

Android HTTP Client: GET, POST, Download, Upload, Multipart Request

Often Android apps have to exchange information with a remote server. The easiest way is to use the HTTP protocol as base to transfer information. There are several scenarios where the HTTP protocol is very useful like downloading an image from a remote server or uploading some binary data to the server. Android app performs GET or POST request to send data. In this post, we want to analyze how to use HttpURLConnection to communicate with a remote server. 

As a server we will use three simple Servlet running inside Tomcat 7.0. We won't cover how to create a Servlet using API 3.0, you can find the source code here.

GET And POST Requests

GET and POST requests are the base blocks in HTTP protocol. To make this kind of requests we need first to open a connection toward the remove server:

HttpURLConnection con = (HttpURLConnection) ( new URL(url)).openConnection();
con.setRequestMethod("POST");
con.setDoInput(true);
con.setDoOutput(true);
con.connect();

In the first line we get the HttpURLConnection, while in the line 2 we set the method and at the end we connect to the server.
Once we have opened the connection we can write on it using the OutputStream.

con.getOutputStream().write( ("name=" + name).getBytes());

As we already know parameters are written using key value pair.
The last step is reading the response, using the InputStream:

InputStream is = con.getInputStream();
byte[] b = new byte[1024];
while ( is.read(b) != -1)
  buffer.append(new String(b));
con.disconnect();

Everything is very simple by now, but we have to remember one thing: making an HTTP connection is a time consuming operation that could require long time sometime so we can't run it in the main thread otherwise we could get a ANR problem. To solve it we can use an AsyncTask.

private class SendHttpRequestTask extends AsyncTask<String, Void, String>{
  
  @Override
  protected String doInBackground(String... params) {
   String url = params[0];
   String name = params[1];
   String data = sendHttpRequest(url, name);
   return data;
  }

  @Override
  protected void onPostExecute(String result) {
   edtResp.setText(result);
   item.setActionView(null);   
  }
}

Running the app we get:



As we can see we post a name to the server and it responds with the classic ‘Hello….’. On the server side we can check that the server received correctly our post parameter:

Download Data From Server

One of the most common scenario is when an Android App has to download some data from a remote sever. We can suppose that we want to download an image from the server. In this case we have always to use an AsyncTask to complete our operation, the code is shown below:

public byte[] downloadImage(String imgName) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {
        System.out.println("URL ["+url+"] - Name ["+imgName+"]");
        
        HttpURLConnection con = (HttpURLConnection) ( new URL(url)).openConnection();
        con.setRequestMethod("POST");
        con.setDoInput(true);
        con.setDoOutput(true);
        con.connect();
        con.getOutputStream().write( ("name=" + imgName).getBytes());
        
        InputStream is = con.getInputStream();
        byte[] b = new byte[1024];
        
        while ( is.read(b) != -1)
            baos.write(b);
        
        con.disconnect();
    }
    catch(Throwable t) {
        t.printStackTrace();
    }
    
    return baos.toByteArray();
}

This method is called in this way:

private class SendHttpRequestTask extends AsyncTask<String, Void, byte[]> {

    
    @Override
    protected byte[] doInBackground(String... params) {
        String url = params[0];
        String name = params[1];
        
        HttpClient client = new HttpClient(url);
        byte[] data = client.downloadImage(name);
        
        return data;
    }

    @Override
    protected void onPostExecute(byte[] result) {
        Bitmap img = BitmapFactory.decodeByteArray(result, 0, result.length);
        imgView.setImageBitmap(img);
        item.setActionView(null);
        
    }
   
}

Running the app we have:

Upload Data To The Server Using MultipartRequest

This the most complex part in handling http connection. Natively HttpURLConnection doesn’t handle this type of request. It can happen that an Android App has to upload some binary data to the server. It can be that an app has to upload an image for example. In this case the request get more complex, because a “normal” request isn’t enough. We have to create a MultipartRequest.

A MultipartRequest is a request that is made by different parts like parameters and binary data. How can we handle this request?

Well the first step is opening a connection informing the server we wants to send some binary info:

public void connectForMultipart() throws Exception {
    con = (HttpURLConnection) ( new URL(url)).openConnection();
    con.setRequestMethod("POST");
    con.setDoInput(true);
    con.setDoOutput(true);
    con.setRequestProperty("Connection", "Keep-Alive");
    con.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
    con.connect();
    os = con.getOutputStream();
}

In the line 6 and 7 we specify the request content-type and another field called boundary. This field is a char sequence used to separate different parts.

For each part we want to add we need to specify if it is text part like post parameter or it is a file (so binary data).

public void addFormPart(String paramName, String value) throws Exception {
  writeParamData(paramName, value);
}

private void writeParamData(String paramName, String value) throws Exception {
    os.write( (delimiter + boundary + "\r\n").getBytes());
    os.write( "Content-Type: text/plain\r\n".getBytes());
    os.write( ("Content-Disposition: form-data; name=\"" + paramName + "\"\r\n").getBytes());;
    os.write( ("\r\n" + value + "\r\n").getBytes());
    
}

where 

private String delimiter = "--";
private String boundary =  "SwA"+Long.toString(System.currentTimeMillis())+"SwA";

To add a file part we can use: 

public void addFilePart(String paramName, String fileName, byte[] data) throws Exception {
    os.write( (delimiter + boundary + "\r\n").getBytes());
    os.write( ("Content-Disposition: form-data; name=\"" + paramName +  "\"; filename=\"" + fileName + "\"\r\n"  ).getBytes());
    os.write( ("Content-Type: application/octet-stream\r\n"  ).getBytes());
    os.write( ("Content-Transfer-Encoding: binary\r\n"  ).getBytes());
    os.write("\r\n".getBytes());
   
    os.write(data);
    
    os.write("\r\n".getBytes());
}

So in our app we have:

private class SendHttpRequestTask extends AsyncTask<String, Void, String> {

    
    @Override
    protected String doInBackground(String... params) {
        String url = params[0];
        String param1 = params[1];
        String param2 = params[2];
        Bitmap b = BitmapFactory.decodeResource(UploadActivity.this.getResources(), R.drawable.logo);
        
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        b.compress(CompressFormat.PNG, 0, baos);

        try {
            HttpClient client = new HttpClient(url);
            client.connectForMultipart();
            client.addFormPart("param1", param1);
            client.addFormPart("param2", param2);
            client.addFilePart("file", "logo.png", baos.toByteArray());
            client.finishMultipart();
            String data = client.getResponse();
        }
        catch(Throwable t) {
            t.printStackTrace();
        }
        
        return null;
    }

    @Override
    protected void onPostExecute(String data) {            
        item.setActionView(null);
        
    }
    
    
    
}

Running it we have:


Source code @ github (for Android App)
Source code for server side servlet here - See more at: http://www.survivingwithandroid.com/2013/05/android-http-downlod-upload-multipart.html#sthash.otnYCuXf.dpuf

How to send video files as json data. (Not the file name or path but content) to Android

1down vote

Of course you could send video-Data in JSON, but since JSON is essentially a String-Format with several reserved Characters you will have to encode the video-data. You could use any scheme you like - but BASE64 is a widely accepted Standard so I would use it. Just create a JSON-String object and fill it with the BASE-64 encoded Video Data. But beware of Buffer-Overflows!!! Because many JSON-Implementations will usually not expect giant Data-Elements in JSON it may be advisable to break the Data-Stream into several smaller Chunks and deliver them one at a time... Of course you could also just stream the JSON-Data itself, but as far as I know most JSON Stacks operate serially, since you can only parse a valid JSON-String if it is complete. So the best thing performance wise (if you REALLY WANT to pack the video Data into JSON, which is clearly not what JSON was ever intended for, and there should be better solutions for almost all setups) should be to BASE64 Encode the Video in a Stream, so you can read Chunks of it into Memory, pack them into JSON-Strings and send these to the Server, which can use these Chunks to stream the Video to a file or play it, or reconstruct it in memory... @BSON was mentioned before - it could be advisable to use it, since the JSON-Data will be compressed. But it doesn't change the fact you have to encode your Video-Data in an unfavorable format, which will bloat up the transmitted data and will cost its fair share of performance on BOTH ENDS! But I can imagine Scenarios where using JSON for video transmission could be advisable. If you have a high number of small videos (small jingles, or video fragments, which the user can select and collate) then a solid easy to handle data structure to administrate these videos could be well worth the extra transfer cost... 1down vote Sending binary data in JSON from PHP is very simple: $data = file_get_contents($filename); echo json_encode(array('filecontent' => $data)); At least in theory this would work. The reason why it does not work in practice is that $data is limited in size (must fit into the memory limit), and that JSON is not meant to transfer megabytes of data. The encoding is inefficient. Either you use the bytes natively, then you will experience escape sequences for any non-printable character, making these bytes getting six times as big (the unicode escape sequence uses a backslash, the letter "u" and four hex numbers). Or you use base64 encoding, which will blow up EVERY byte by about 33%. Not counting the overhead for the most basic JSON wrapping. Offering a native stream of bytes with an appropriate header seems to be the better idea. You could directly feed that stream into the video codec for replay, without having to parse JSON, decode base64 and reassemble everything back into a video data stream. Here is the info according to the PHP official documentation. Hopefully it will work for the video file. HttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost(serverURL); MultipartEntity postEntity = new MultipartEntity(); File file = new File("file path to be put here"); postEntity.addPart("fileupload", new FileBody(file, "video/mp4")); postEntity.addPart("loginKey", new StringBody(""+loginKey)); postEntity.addPart("message", new StringBody(message)); postEntity.addPart("token", new StringBody(token)); post.setEntity(postEntity); response = client.execute(post);   try this it works for you. HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(URL);// FileBody filebodyVideo = new FileBody(file); StringBody title = new StringBody("Filename: " + filename); MultipartEntity reqEntity = new MultipartEntity(); reqEntity.addPart("videoFile", filebodyVideo); httppost.setEntity(reqEntity); HttpResponse response = httpclient.execute( httppost ); You can encode any binary file into base64 and then output a JSON string like this: <?php $fgc = file_get_contents('yourfile.gif'); //can be any binary $bindata = base64_encode($fgc); $arr = array('name'=>'yourfile.gif','mime'=>'image/gif','data'=>$bindata); echo json_encode($arr); ?>   <?php if(isset($_GET['name'])) { $video_name = $_GET['name']; $path = "/path/to/videos/folder/$video_name"; //ex: video.mp4 $size=filesize($path); $fm=@fopen($path,'rb'); if(!$fm) { // You can also redirect here header ("HTTP/1.0 404 Not Found"); die(); } $begin=0; $end=$size; if(isset($_SERVER['HTTP_RANGE'])) { if(preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches)) { $begin=intval($matches[0]); if(!empty($matches[1])) { $end=intval($matches[1]); } } } if($begin>0||$end<$size) header('HTTP/1.0 206 Partial Content'); else header('HTTP/1.0 200 OK'); header("Content-Type: video/mp4"); header('Accept-Ranges: bytes'); header('Content-Length:'.($end-$begin)); header("Content-Disposition: inline;"); header("Content-Range: bytes $begin-$end/$size"); header("Content-Transfer-Encoding: binary\n"); header('Connection: close'); $cur=$begin; fseek($fm,$begin,0); while(!feof($fm)&&$cur<$end&&(connection_status()==0)) { print fread($fm,min(1024*16,$end-$cur)); $cur+=1024*16; usleep(1000); } die(); }else{ echo "Please provide a Video name (name=)"; } ?> ava Code (Download and Save video to SDCARD): import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import android.content.Intent; import android.os.AsyncTask; import android.os.Environment; import android.util.Log; public class VideoSaveSDCARD extends Activity{ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ProgressBack PB = new ProgressBack(); PB.execute(""); } class ProgressBack extends AsyncTask<String,String,String> { ProgressDialog PD; @Override protected void onPreExecute() { PD= ProgressDialog.show(LoginPage.this,null, "Please Wait ...", true); PD.setCancelable(true); } @Override protected void doInBackground(String... arg0) { DownloadFile("http://yourserver/video.php?name=video.mp4","video.mp4"); } protected void onPostExecute(Boolean result) { PD.dismiss(); } } public void DownloadFile(String fileURL, String fileName) { try { String RootDir = Environment.getExternalStorageDirectory() + File.separator + "Video"; File RootFile = new File(RootDir); RootFile.mkdir(); // File root = Environment.getExternalStorageDirectory(); URL u = new URL(fileURL); HttpURLConnection c = (HttpURLConnection) u.openConnection(); c.setRequestMethod("GET"); c.setDoOutput(true); c.connect(); FileOutputStream f = new FileOutputStream(new File(RootFile, fileName)); InputStream in = c.getInputStream(); byte[] buffer = new byte[1024]; int len1 = 0; while ((len1 = in.read(buffer)) > 0) { f.write(buffer, 0, len1); } f.close(); } catch (Exception e) { Log.d("Error....", e.toString()); } } }