I'm attempting to analyze the latest image attained with Android's CameraX. At this stage, I'm using the androidx.camera:camera-camera2 1.0.0-alpha05 release. In my MainActivity.java I don't know how to get the latest image into the analysis (ImageProxy image, int rotationDegrees) method.
How and where do I attain the latest image and then pass it to the analysis method?
My code is like below
public class MainActivity extends AppCompatActivity {
private static final String TAG = "Christo";
private int REQUEST_CODE_PERMISSIONS = 101;
private final String[] REQUIRED_PERMISSIONS = new String[]{"android.permission.CAMERA", "android.permission.WRITE_EXTERNAL_STORAGE"};
TextureView textureView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textureView = findViewById(R.id.view_finder);
if(allPermissionsGranted()){
startCamera(); //start camera if permission has been granted by user
} else{
ActivityCompat.requestPermissions(this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS);
}
}
private void startCamera() {
Log.v(TAG, "startCamera()");
CameraX.unbindAll();
Rational aspectRatio = new Rational (textureView.getWidth(), textureView.getHeight());
Size screen = new Size(textureView.getWidth(), textureView.getHeight()); //size of the screen
PreviewConfig pConfig = new PreviewConfig.Builder()
.setTargetAspectRatio(aspectRatio) //AspectRatio.RATIO_4_3
.setTargetResolution(screen)
//.setLensFacing(CameraX.LensFacing.FRONT)
.build();
Preview preview = new Preview(pConfig);
preview.setOnPreviewOutputUpdateListener(
new Preview.OnPreviewOutputUpdateListener() {
@Override
public void onUpdated(Preview.PreviewOutput output){
ViewGroup parent = (ViewGroup) textureView.getParent();
parent.removeView(textureView);
parent.addView(textureView, 0);
textureView.setSurfaceTexture(output.getSurfaceTexture());
updateTransform();
}
});
ImageCaptureConfig imageCaptureConfig = new ImageCaptureConfig.Builder().setCaptureMode(ImageCapture.CaptureMode.MIN_LATENCY)
.setTargetRotation(getWindowManager().getDefaultDisplay().getRotation()).build();
final ImageCapture imgCap = new ImageCapture(imageCaptureConfig);
findViewById(R.id.imgCapture).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final String timeStamp = new SimpleDateFormat("MM_dd_HH_mm_ss").format(new Date());
File file = new File(Environment.getExternalStorageDirectory() + "/Christo/pic" + timeStamp + ".png");
imgCap.takePicture(file, new ImageCapture.OnImageSavedListener() {
@Override
public void onImageSaved(@NonNull File file) {
String msg = "Pic captured at " + file.getAbsolutePath();
Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
}
@Override
public void onError(@NonNull ImageCapture.ImageCaptureError useCaseError, @NonNull String message, @Nullable Throwable cause) {
String msg = "Pic capture failed : " + message;
Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
if(cause != null){
cause.printStackTrace();
}
}
});
}
});
ImageAnalysisConfig imageConfig = new ImageAnalysisConfig.Builder().setImageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE).build();
ImageAnalysis analysis = new ImageAnalysis(imageConfig);
analysis.setAnalyzer(
new ImageAnalysis.Analyzer(){
@Override
public void analyze(ImageProxy image, int rotationDegrees){
Log.v(TAG, "analyze");
// My code to analyze image - yet to be developed
}
});
//bind to lifecycle:
CameraX.bindToLifecycle((LifecycleOwner)this, preview, imgCap);
}
private void updateTransform(){
Log.v(TAG, "updateTransform()");
Matrix mx = new Matrix();
float w = textureView.getMeasuredWidth();
float h = textureView.getMeasuredHeight();
float cX = w / 2f;
float cY = h / 2f;
int rotationDgr;
int rotation = (int)textureView.getRotation();
switch(rotation){
case Surface.ROTATION_0:
rotationDgr = 0;
break;
case Surface.ROTATION_90:
rotationDgr = 90;
break;
case Surface.ROTATION_180:
rotationDgr = 180;
break;
case Surface.ROTATION_270:
rotationDgr = 270;
break;
default:
return;
}
mx.postRotate((float)rotationDgr, cX, cY);
textureView.setTransform(mx);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if(requestCode == REQUEST_CODE_PERMISSIONS){
if(allPermissionsGranted()){
startCamera();
} else{
Toast.makeText(this, "Permissions not granted by the user.", Toast.LENGTH_SHORT).show();
finish();
}
}
}
private boolean allPermissionsGranted(){
for(String permission : REQUIRED_PERMISSIONS){
if(ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED){
return false;
}
}
return true;
}
}
...
