Ich versuche, eine Text-Scanner-Anwendung mit der Kamera, die Text und zeigt in Bildschirm zu erkennen. Aber statt der Kamera zeigt es einen schwarzen Bildschirm. Wie kann ich das lösen? Mein Code ist hiermachen Text-Scanner, aber zeigt schwarzen Bildschirm anstelle der Kamera
package com.myapp.game.easynepalirecharge;
import android.Manifest;
import android.app.ActionBar;
import android.content.pm.PackageManager;
import android.graphics.Camera;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseArray;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup;
import android.widget.TextView;
import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.text.TextBlock;
import com.google.android.gms.vision.text.TextRecognizer;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
SurfaceView cameraView;
TextView textView;
CameraSource cameraSource;
final int REQUESTCAMERAPERMISSION = 105;
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull final int[] grantResults) {
switch (requestCode) {
case REQUESTCAMERAPERMISSION:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.checkSelfPermission(getApplication(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
return;
}
try {
cameraSource.start(cameraView.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cameraView = (SurfaceView) findViewById(R.id.surfaceView);
textView = (TextView) findViewById(R.id.textView);
TextRecognizer textRecognizer = new TextRecognizer.Builder(getApplicationContext()).build();
if (!textRecognizer.isOperational()) {
Log.v("haha", "error not operational");
} else {
cameraSource = new CameraSource.Builder(getApplicationContext(), textRecognizer).
setFacing(CameraSource.CAMERA_FACING_BACK)
.setRequestedPreviewSize(3840, 2160)
.setRequestedFps(2.0f)
.setAutoFocusEnabled(true)
.build();
cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, REQUESTCAMERAPERMISSION);
cameraSource.start(cameraView.getHolder());
return;
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
cameraSource.stop();
}
});
textRecognizer.setProcessor(new Detector.Processor<TextBlock>() {
@Override
public void release() {
}
@Override
public void receiveDetections(Detector.Detections<TextBlock> detections) {
final SparseArray<TextBlock> items = detections.getDetectedItems();
if (items.size() != 0) {
textView.post(new Runnable() {
@Override
public void run() {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i <= items.size(); i++) {
TextBlock item = items.valueAt(i);
stringBuilder.append(item.getValue());
stringBuilder.append("\n");
}
textView.setText(stringBuilder.toString());
}
});
}
}
}
);
}
}
}
und eine andere Sache, die ich fragen will. Welches ist besser. Dies oder die tess zwei Bibliothek?
oh ja die Erlaubnis wurde für über 23 API-Ebene benötigen. Danke hat meinen Tag gerettet! –