Question

我正在学习如何在我的应用中实现图像到文本，我一直在关注多个教程。但问题总是与textRecognizer无法运行相同。

我已在我的gradle中添加了Google Play服务：compile 'com.google.android.gms:play-services-vision:10.2.1'

我已经读到：第一次使用条形码和/或面部API的应用程序安装在设备上时，GMS会将库下载到设备以进行条形码和面部检测。通常这是由安装程序在第一次运行应用程序之前完成的。但不知怎的，它不起作用

这是我的清单：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.gin.scantext">
<uses-permission android:name="android.permission.CAMERA"/>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <meta-data android:name="com.google.android.gms.vision.DEPENDENCIES"
        android:value="ocr"/>
</application>

这是我的活动：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    cameraView = (SurfaceView) findViewById(R.id.surface_view);
    textView = (TextView) findViewById(R.id.text_view);


    TextRecognizer textRecognizer = new TextRecognizer.Builder(getApplicationContext()).build();
    if (!textRecognizer.isOperational()) {
        Log.w("MainActivity", "Detector dependencies are not yet available");
    } else {

        cameraSource = new CameraSource.Builder(getApplicationContext(), textRecognizer)
                .setFacing(CameraSource.CAMERA_FACING_BACK)
                .setRequestedPreviewSize(1280, 1024)
                .setRequestedFps(2.0f)
                .setAutoFocusEnabled(true)
                .build();
        cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder surfaceHolder) {

                try {
                    if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {

                        ActivityCompat.requestPermissions(MainActivity.this,
                                new String[]{Manifest.permission.CAMERA},
                                RequestCameraPermissionID);
                        return;
                    }
                    cameraSource.start(cameraView.getHolder());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
                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());
                        }
                    });
                }
            }
        });
    }
}

Answer 1

将此添加到您的AndroidManifest.xml

    <application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">


    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.gms.vision.DEPENDENCIES"
        android:value="ocr"/>

图像到文本无法正常工作 - 文本识别器无法运行

1 个答案: