Android Call Device Existing Camera Application Details

Directory 1, Photo 1.1 Request Camera Function 1.2 Call Camera Application to Take Picture for Thumbnail 1.3 Call Camera Application to Take Picture for Complete Picture 1.4 Camera Application to Return Thumbnail, Complete Picture 2, Save File Configuration 3, Record Video 3.1 Call Camera Application to Record Video 3.2 Camera Application to Return Video

If we just need to enable users to take photos, we can directly request the existing camera application to take photos and return them to us

1. Take pictures

1.1 Request camera function

In the manifest file, add:

  <manifest ... >
        <uses-feature android:name="android.hardware.camera"
                      android:required="true" />
        ...
    </manifest>

If your application uses a camera, but can work normally without a camera, you should set android:required Set to false . In this way, Google Play Devices that do not have a camera will be allowed to download your application.

1.2 Call the camera application to take pictures and get thumbnails

    static final int REQUEST_IMAGE_CAPTURE = 1;

    // Call the camera application to take pictures 
    private void takePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    }
    

1.3 Call the camera application to take a picture and get a complete picture

// Call the camera application to take a picture and get a complete picture 
private void takePictureGetFile() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                    this.getPackageName()+".fileprovider",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQ_2);
        }
    }
}

1.4 Camera application returns thumbnail, complete picture

Android The camera application will return the Intent (Passed to onActivityResult () as a small Bitmap in extra, using the key "data").

The following code retrieves this picture and displays it in 1 ImageView

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    // Get thumbnails 
    if (requestCode == REQ_1 && resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        Bitmap imageBitmap = (Bitmap) extras.get("data");
        ivThumbnail.setImageBitmap(imageBitmap);
    }
    // Get the full picture 
    if (requestCode == REQ_2) {
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(currentPhotoPath);
            Bitmap bitmap = BitmapFactory.decodeStream(fis);
            ivComplete.setImageBitmap(bitmap);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }
    // Watch the video 
    if (requestCode == REQ_3 && resultCode == RESULT_OK) {
        Uri videoUri = data.getData();
        vvVideo.setMediaController(new MediaController(this));
        vvVideo.setVideoURI(videoUri);
        vvVideo.start();
    }
}

2. Save the configuration of the file

Having write permission implies that you can read, so you only need to request write permission

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

Note:

getUriForFile (Context, String, File) returns content://URI. For the latest applications that target Android 7.0 (API level 24) and later, passing file://URI across package boundaries results in FileUriExposedException. Therefore, a more general method to use FileProvider Save pictures.

Add a provider to the manifest file:

    <application>
       ...
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>
        ...
    </application>
    

Ensure that the authorization string is the same as the getUriForFile (Context, String, File). New File res/xml/file_paths.xml

    <?xml version="1.0" encoding="utf-8"?>
    <paths xmlns:android="http://schemas.android.com/apk/res/android">
        <external-files-path name="my_images" path="Android/data/com.example.package.name/files/Pictures" />
    </paths>
    

The path component corresponds to getExternalFilesDir() The path returned (when Environment. DIRECTORY_PICTURES is called). Be sure to put false0 Replace with the actual package name of the application.

3. Record video

3.1 Call the camera application to record video

// Call the camera application to record video 
private void takeVideo() {
    Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
    if (takeVideoIntent.resolveActivity(getPackageManager()) != null) {// If it is null, The application will crash 
        File videoFile = null;
        try {
            videoFile = createVideoFile();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        if (videoFile != null) {
            Uri videoURI = FileProvider.getUriForFile(this,
                    this.getPackageName()+".fileprovider",
                    videoFile);
            takeVideoIntent.putExtra(MediaStore.EXTRA_OUTPUT, videoURI);
            startActivityForResult(takeVideoIntent, REQ_3);
        }
    }
}

3.2 Camera application returns video

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    // Watch the video 
    if (requestCode == REQ_3 && resultCode == RESULT_OK) {
        Uri videoUri = data.getData();
        vvVideo.setMediaController(new MediaController(this));
        vvVideo.setVideoURI(videoUri);
        vvVideo.start();
    }
 }