所以我有这个按钮来拍照包含文本：
takePic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent,100);
}
});
然后我从onActivityResult获取图像：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 100) {
Bitmap bitmap = (Bitmap) data.getExtras().get("data");
}
}
现在的问题是，当我将此位图传递给textRecognizer检测器时，没有任何结果：
Bitmap bitmap = (Bitmap) data.getExtras().get("data");
Frame frame = new Frame.Builder().setBitmap(bitmap).build();
textRecognizer = new TextRecognizer.Builder(this).build();
SparseArray<TextBlock> item = textRecognizer.detect(frame);
如果图像存储在可绘制的文件夹中，我可以轻松地做到这一点：
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.myImage);
而且我很好选择TextRecognizer ..
但我不知道如何处理相机拍摄的图像。
编辑：
完整的例子：
public class MainActivity extends AppCompatActivity {
private TextRecognizer textRecognizer;
private ImageView imageView;
private TextView Result;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = findViewById(R.id.imageView);
Result = findViewById(R.id.tvResult);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.image);
Frame frame = new Frame.Builder().setBitmap(bitmap).build();
textRecognizer = new TextRecognizer.Builder(this).build();
SparseArray<TextBlock> item = textRecognizer.detect(frame);
StringBuilder stringBuilder = new StringBuilder();
for (int i=0; i<item.size(); i++){
stringBuilder.append(item.valueAt(i).getValue());
}
Result.setText(stringBuilder.toString());
}
}
activity_main.xml：
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/image" />
<TextView
android:id="@+id/tvResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="96dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="result"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
最佳答案
最好将文件提供给相机意图，以便为您保存文件。
根据This Answer：
private static final int CAMERA_PHOTO = 111;
private Uri imageToUploadUri;
private void captureCameraImage() {
Intent chooserIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(Environment.getExternalStorageDirectory(), "POST_IMAGE.jpg");
chooserIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
imageToUploadUri = Uri.fromFile(f);
startActivityForResult(chooserIntent, CAMERA_PHOTO);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CAMERA_PHOTO && resultCode == Activity.RESULT_OK) {
if(imageToUploadUri != null){
Uri selectedImage = imageToUploadUri;
getContentResolver().notifyChange(selectedImage, null);
Bitmap reducedSizeBitmap = getBitmap(imageToUploadUri.getPath());
if(reducedSizeBitmap != null){
ImgPhoto.setImageBitmap(reducedSizeBitmap);
Button uploadImageButton = (Button) findViewById(R.id.uploadUserImageButton);
uploadImageButton.setVisibility(View.VISIBLE);
}else{
Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
}
}else{
Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
}
}
}
private Bitmap getBitmap(String path) {
Uri uri = Uri.fromFile(new File(path));
InputStream in = null;
try {
final int IMAGE_MAX_SIZE = 1200000; // 1.2MP
in = getContentResolver().openInputStream(uri);
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, o);
in.close();
int scale = 1;
while ((o.outWidth * o.outHeight) * (1 / Math.pow(scale, 2)) >
IMAGE_MAX_SIZE) {
scale++;
}
Log.d("", "scale = " + scale + ", orig-width: " + o.outWidth + ", orig-height: " + o.outHeight);
Bitmap b = null;
in = getContentResolver().openInputStream(uri);
if (scale > 1) {
scale--;
// scale to max possible inSampleSize that still yields an image
// larger than target
o = new BitmapFactory.Options();
o.inSampleSize = scale;
b = BitmapFactory.decodeStream(in, null, o);
// resize to desired dimensions
int height = b.getHeight();
int width = b.getWidth();
Log.d("", "1th scale operation dimenions - width: " + width + ", height: " + height);
double y = Math.sqrt(IMAGE_MAX_SIZE
/ (((double) width) / height));
double x = (y / height) * width;
Bitmap scaledBitmap = Bitmap.createScaledBitmap(b, (int) x,
(int) y, true);
b.recycle();
b = scaledBitmap;
System.gc();
} else {
b = BitmapFactory.decodeStream(in);
}
in.close();
Log.d("", "bitmap size - width: " + b.getWidth() + ", height: " +
b.getHeight());
return b;
} catch (IOException e) {
Log.e("", e.getMessage(), e);
return null;
}
}
关于android - 如何拍摄图片，然后使用TextRecognizer阅读其文本，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/49314353/