Cropping Video In Android


Hey guyz, First of all to cropping video we need to use TextureView and this component available from android API 14.

Step 1: Create activity/fragment layout

<FrameLayout xmlns:android=""

        android:layout_height="match_parent" />


Step 2: Add video file

If you want to add video to your project you should add it to /res/raw directory

Step 3: Add below code to activity/fragment


    public static final int MY_VIDEO_WIDTH = 1920;
    public static final int MY_VIDEO_HEIGHT = 1080;

    // I'm using ButterKnife binding my views you can use findViewById instead
    TextureView textureView;
    MediaPlayer mediaPlayer;


    public void onStart() {

    public void onStop() {
        if (mediaPlayer != null) {
            mediaPlayer = null;

    public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int i, int i1) {
        Surface surface = new Surface(surfaceTexture);
        scaleToCropCenter(MY_VIDEO_WIDTH, MY_VIDEO_HEIGHT, this.textureView.getWidth(), this.textureView.getHeight());

        try {
            mediaPlayer = MediaPlayer.create(getActivity(),;

        } catch (Exception e) {

    private void scaleToCropCenter(int videoWidth, int videoHeight, int viewWidth, int viewHeight) {
        float scaleX = 1.0f;
        float scaleY = 1.0f;

        if (videoWidth > viewWidth && videoHeight > viewHeight) {
            scaleX = division(videoWidth, viewWidth);
            scaleY = division(videoHeight, viewHeight);
        } else if (videoWidth < viewWidth && videoHeight < viewHeight) {             scaleY = division(viewWidth , videoWidth);             scaleX = division(viewHeight , videoHeight);         } else if (viewWidth > videoWidth) {
            scaleY = division(division(viewWidth, videoWidth), division(viewHeight, videoHeight));
        } else if (viewHeight > videoHeight) {
            scaleX = division(division(videoWidth, viewWidth), division(viewHeight, videoHeight));

        int pivotPointX = viewWidth / 2;
        int pivotPointY = viewHeight / 2;

        Matrix matrix = new Matrix();
        matrix.setScale(scaleX, scaleY, pivotPointX, pivotPointY);

        textureView.setLayoutParams(new FrameLayout.LayoutParams(viewWidth, viewHeight));

    private float division(float value1, float value2) {
        if (value1 > value2)
            return value1 / value2;
        else return value2 / value1;


That’s it ūüėČ


Simple Practices for Designing RESTful API


Following these standards means:

  • Documentation will make more sense and so developers will understand your API quicker.
  • Developers will therefore be able to integrate quicker and therefore deliver products faster and at lower cost.
  • Many of the principles will make your clients faster,¬†improving product quality

1. Use nouns but not verb

For an easy understanding use this structure for every resources:
Screenshot from 2016-04-06 01:11:33

Note: Do not mix up singular and plural nouns, Keep it simple and use only plural nouns for all resources

2. Use sub-resources for relations

If a resource is related to another resource use subresources
Example: GET /cars/711/drivers/4  Return driver #4 for car 711

3. Provide filtering, sorting and paging for collections


Use a unique query parameter for all fields.
Example: GET /cars?color=red


Allow ascending and descending sorting over multiple fields.
Example: GET /cars?sort=-model


Use limit and next URL. It is easy for the client to showing items.
Example: /cars?limit=10


4. Version your API

Make the API Version mandatory and do not release an unversioned API.
Note: Use a simple ordinal number and avoid dot notation such as 2.5

5. Error handling

Error responses should include a common HTTP status code, message for developer, message for the end-user (when appropriate).
For example:

“developerMessage”:”Verbose, plain language description of the problem”,
“userMessage”:”This is a message that can be passed along to end-users, if needed.”

Use three simple, common response codes indicating (1) success, (2) failure due to client-side problem, (3) failure due to server-side problem:

  1. 200 – OK
  2. 400 – Bad Request
  3. 500 – Internal Server Error

6. Using actions

Sometimes, it is required to expose an operation in the API that inherently is non RESTful. Actions are basically RPC-like messages to a resource to perform a certain operation.

Example: POST /users/12/follow   Following user #12

Note: The actions should only be used as an exception, when there is a good reason that an operation cannot be mapped to one of the standard RESTful methods.

Thank you guys: