Download and Install App programmatically

Science Fantasy

You can download an apk file of any application and install it thru your app and all this you can do programmatically. Let's see how to do it:

1. First download the apk file programmatically and store it in external storage.

private void download(){
try {
    URL url = new URL("url from apk file is to be downloaded");
    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
    urlConnection.setRequestMethod("GET");
    urlConnection.setDoOutput(true);
    urlConnection.connect();

    File sdcard = Environment.getExternalStorageDirectory();
    File file = new File(sdcard, "filename.ext");

    FileOutputStream fileOutput = new FileOutputStream(file);
    InputStream inputStream = urlConnection.getInputStream();

    byte[] buffer = new byte[1024];
    int bufferLength = 0;

    while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
        fileOutput.write(buffer, 0, bufferLength);
    }
    fileOutput.close();

} catch (MalformedURLException e) {
        e.printStackTrace();
} catch (IOException e) {
        e.printStackTrace();
}
}

Permission: To write to external storage, you need to add this permission:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Note: The above download method can be used to download any file and store the file to external storage.

2. Now initiate installing process.

private void initiateInstallation(){
    Intent intent = new Intent(Intent.ACTION_VIEW);
    Uri uri = Uri.fromFile(new File("/sdcard/filename.apk"));
    intent.setDataAndType(uri, "application/vnd.android.package-archive");
    startActivity(intent);
}

Working with Call log

We often need to access call log details i.e. incoming number, outgoing number, missed call. We want to modify the call log i.e. make your own entry, deleting an existing entry. So let's see how can we do all this:

Uri UriCalls = Uri.parse("content://call_log/calls");

Cursor cursor = getApplicationContext().getContentResolver().query(UriCalls, null, null, null, null);

//Reading call log entries...

if(cursor.getCount() > 0){

    cursor.moveToFirst();

    while(!cursor.isAfterLast()){

        String number = cursor.getString(cursor.getColumnIndex(CallLog.Calls.NUMBER)); // for  number

        String name = cursor.getString(cursor.getColumnIndex(CallLog.Calls.CACHED_NAME));// for name

        String duration = cursor.getString(cursor.getColumnIndex(CallLog.Calls.DURATION));// for duration

        int type = Integer.parseInt(cursor.getString(cursor.getColumnIndex(CallLog.Calls.TYPE)));// for call type, Incoming or out going

        cursor.moveToNext();

    }

}

//Inserting values in call log...

ContentValues values = new ContentValues();

values.put(CallLog.Calls.NUMBER, number);

values.put(CallLog.Calls.CACHED_NAME, name);

values.put(CallLog.Calls.CACHED_NUMBER_LABEL, label);

values.put(CallLog.Calls.DATE, date);

values.put(CallLog.Calls.DURATION, duration);

values.put(CallLog.Calls.TYPE, myCallType);

getApplicationContext().getContentResolver().insert(CallLog.Calls.CONTENT_URI, values);

//Deleting entry in call log...

String queryString= "NUMBER='" + number + "'";

if (cursor.getCount() > 0){

        getApplicationContext().getContentResolver().delete(UriCalls, queryString, null);

}

Permission:

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

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

Note: Please refer this doc over call log for more clearity.