我正在尝试将Google Mobile Vision TextRecogniser API实施到我的应用中，以便从给定的图片中读取文字。当我尝试使用该功能时，我收到此错误：
W/DynamiteModule: Local module descriptor class for com.google.android.gms.vision.dynamite not found.
I/DynamiteModule: Considering local module com.google.android.gms.vision.dynamite:0 and remote module com.google.android.gms.vision.dynamite:801
I/DynamiteModule: Selected remote version of com.google.android.gms.vision.dynamite, version >= 801
W/System: ClassLoader referenced unknown path: /data/user_de/0/com.google.android.gms/app_chimera/m/00000005/n/arm64-v8a
D/ApplicationLoaders: ignored Vulkan layer search path /data/app/com.google.android.gms-1/lib/arm64:/system/fake-libs64:/data/app/com.google.android.gms-1/base.apk!/lib/arm64-v8a for namespace 0x7a2e8c60f0
I/Vision: Loading libocr library
I/Vision: libocr load status: false
I/TextRecognizerCreatorImpl: Requesting download for native text recognizer
W/TextNativeHandle: Native handle not yet available. Reverting to no-op handle.
我相信这意味着图书馆没有下载到手机上。
我已针对常见错误来源进行了问题排查，包括缺少互联网连接，内存不足，缺少依赖关系，重新启动手机，更新Google Play服务，等待一段时间等等.Google存储库和Play服务也会在Android工作室中更新。< / p>
然而，即使在不同的设备上试用我的应用程序，我仍然会遇到同样的错误。
答案 0 :(得分：5)
我认为下载是由Google Play服务应用程序执行的。库将作为zip文件下载到文件夹
中/data/data/com.google.android.gms/cache/downloadservice
并被提取到
/data/data/com.google.android.gms/files/com.google.android.gms.vision
我们的应用程序始终检查路径中的库
06-02 22:43:53.379 30258-30419/pzy64.searchbot I/Vision: Loading library libocr.so
如果文件不存在则显示错误
06-02 22:43:53.475 30258-30419/pzy64.searchbot I/Vision: libocr.so library load status: false
，否则
06-03 09:42:33.372 23451-24679/pzy64.searchbot I/Vision: libocr.so library load status: true
下载后， 在我的情况下（ARM）文件夹大小
/data/data/com.google.android.gms/files/com.google.android.gms.vision
大约是5MB。（因此下载的文件小于此大小，不同架构的大小可能会有所不同。我的华硕手机（x86）需要更多时间下载。）
请参阅我的Logcat - （过滤器使用＆＃39; Vision＆＃39;）。
06-02 22:45:45.489 14970-31705/? I/Vision: Registration status ocr_armeabi_v7a.zip: The download is in progress.
06-02 22:45:45.542 14970-31705/? I/Vision: Download status ocr_armeabi_v7a.zip: The download is in progress.
06-02 22:43:53.379 30258-30419/pzy64.searchbot I/Vision: Loading library libocr.so
06-02 22:43:53.387 30258-30419/pzy64.searchbot I/Vision: libocr.so library load status: false
06-02 22:43:53.410 30258-30419/pzy64.searchbot I/Vision: Loading library libocr.so
06-02 22:43:53.411 30258-30419/pzy64.searchbot I/Vision: libocr.so library load status: false
06-02 22:43:53.475 30258-30419/pzy64.searchbot I/Vision: Loading library libocr.so
06-02 22:43:53.475 30258-30419/pzy64.searchbot I/Vision: libocr.so library load status: false
................... ..............
................... ..............
06-02 22:51:08.364 14970-3424/? I/Vision: Finished download ocr_armeabi_v7a.zip
06-02 22:51:08.421 14970-3424/? I/Vision: Unzipping /data/data/com.google.android.gms/cache/downloadservice/ocr_armeabi_v7a.zip to /data/data/com.google.android.gms/files/com.google.android.gms.vision/ocr
06-02 22:51:08.645 14970-3424/? I/Vision: Time to download ocr: 436558
06-02 22:51:09.142 3303-3489/pzy64.searchbot I/Vision: Loading library libocr.so
06-02 22:51:09.149 3303-3489/pzy64.searchbot I/Vision: libocr.so library load status: true
06-02 22:51:09.149 3303-3489/pzy64.searchbot I/Vision: Reading ocr models from /data/data/com.google.android.gms/files/com.google.android.gms.vision/ocr/data/models
答案 1 :(得分：5)
我执行Google Play服务应用的“清除数据”并且有效！
答案 2 :(得分：2)
我认为你错过了添加＆＃34;元数据＆＃34;在应用程序的清单文件中标记。此元数据标记告诉您的应用程序将库下载并集成到您的应用程序中。尝试在＆＃34;应用程序＆＃34;中添加元数据标记。以上标记＆＃34;活动＆＃34;清单文件中的标记。见下文：
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
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="barcode"/>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
这可能会解决您的问题。
答案 3 :(得分：2)
compile 'com.android.support:support-v4:24+'
compile 'com.android.support:design:24+'
除此之外
编译'com.google.android.gms:play-services-vision:10.2.1'
其他两行也很重要。
答案 4 :(得分：1)
您是否已加入<uses-permission android:name="android.permission.INTERNET" />？
答案 5 :(得分：1)
如果以后我不知道 但是伙计们，在经历了数小时的挑战之后，问题解决了，购买了将Google Play服务更新到版本（12.6.85），然后我重新启动了设备，您猜怎么着？该应用程序运行良好。 要更新此Google Play服务，我点击了此链接
答案 6 :(得分：0)
我有完全相同的问题。我登录Google Play服务后便下载了该软件，条形码检测器在相机中正常工作。
答案 7 :(得分：-1)
试试这个，它为我工作。
<强>的build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25"
defaultConfig {
applicationId "com.truiton.mobile.vision.ocr"
minSdkVersion 15
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.0.0'
testCompile 'junit:junit:4.12'
compile 'com.google.android.gms:play-services-vision:9.8.0'
compile 'com.android.support.constraint:constraint-layout:1.0.0-beta3'
}
<强> activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
android:id="@+id/activity_main"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.truiton.mobile.vision.ocr.MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_marginTop="16dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@mipmap/truiton"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1"/>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:text="Scan Text"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1"
/>
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:text="Scan Results:"
android:textAllCaps="false"
android:textStyle="normal|bold"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1"/>
<ScrollView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="8dp"
android:paddingLeft="5dp"
android:paddingRight="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
tools:layout_constraintLeft_creator="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/results"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintTop_creator="1"/>
</LinearLayout>
</ScrollView>
</android.support.constraint.ConstraintLayout>
<强>的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.truiton.mobile.vision.ocr"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-feature
android:name="android.hardware.camera"
android:required="true"/>
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<meta-data
android:name="com.google.android.gms.vision.DEPENDENCIES"
android:value="ocr"/>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
<强> MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final String LOG_TAG = "Text API";
private static final int PHOTO_REQUEST = 10;
private TextView scanResults;
private Uri imageUri;
private TextRecognizer detector;
private static final int REQUEST_WRITE_PERMISSION = 20;
private static final String SAVED_INSTANCE_URI = "uri";
private static final String SAVED_INSTANCE_RESULT = "result";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.button);
scanResults = (TextView) findViewById(R.id.results);
if (savedInstanceState != null) {
imageUri = Uri.parse(savedInstanceState.getString(SAVED_INSTANCE_URI));
scanResults.setText(savedInstanceState.getString(SAVED_INSTANCE_RESULT));
}
detector = new TextRecognizer.Builder(getApplicationContext()).build();
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ActivityCompat.requestPermissions(MainActivity.this, new
String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_WRITE_PERMISSION);
}
});
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_WRITE_PERMISSION:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
takePicture();
} else {
Toast.makeText(MainActivity.this, "Permission Denied!", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PHOTO_REQUEST && resultCode == RESULT_OK) {
launchMediaScanIntent();
try {
Bitmap bitmap = decodeBitmapUri(this, imageUri);
if (detector.isOperational() && bitmap != null) {
Frame frame = new Frame.Builder().setBitmap(bitmap).build();
SparseArray<TextBlock> textBlocks = detector.detect(frame);
String blocks = "";
String lines = "";
String words = "";
for (int index = 0; index < textBlocks.size(); index++) {
//extract scanned text blocks here
TextBlock tBlock = textBlocks.valueAt(index);
blocks = blocks + tBlock.getValue() + "\n" + "\n";
for (Text line : tBlock.getComponents()) {
//extract scanned text lines here
lines = lines + line.getValue() + "\n";
for (Text element : line.getComponents()) {
//extract scanned text words here
words = words + element.getValue() + ", ";
}
}
}
if (textBlocks.size() == 0) {
scanResults.setText("Scan Failed: Found nothing to scan");
} else {
scanResults.setText(scanResults.getText() + "Blocks: " + "\n");
scanResults.setText(scanResults.getText() + blocks + "\n");
scanResults.setText(scanResults.getText() + "---------" + "\n");
scanResults.setText(scanResults.getText() + "Lines: " + "\n");
scanResults.setText(scanResults.getText() + lines + "\n");
scanResults.setText(scanResults.getText() + "---------" + "\n");
scanResults.setText(scanResults.getText() + "Words: " + "\n");
scanResults.setText(scanResults.getText() + words + "\n");
scanResults.setText(scanResults.getText() + "---------" + "\n");
}
} else {
scanResults.setText("Could not set up the detector!");
}
} catch (Exception e) {
Toast.makeText(this, "Failed to load Image", Toast.LENGTH_SHORT)
.show();
Log.e(LOG_TAG, e.toString());
}
}
}
private void takePicture() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File photo = new File(Environment.getExternalStorageDirectory(), "picture.jpg");
imageUri = Uri.fromFile(photo);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, PHOTO_REQUEST);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
if (imageUri != null) {
outState.putString(SAVED_INSTANCE_URI, imageUri.toString());
outState.putString(SAVED_INSTANCE_RESULT, scanResults.getText().toString());
}
super.onSaveInstanceState(outState);
}
private void launchMediaScanIntent() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
mediaScanIntent.setData(imageUri);
this.sendBroadcast(mediaScanIntent);
}
private Bitmap decodeBitmapUri(Context ctx, Uri uri) throws FileNotFoundException {
int targetW = 600;
int targetH = 600;
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(ctx.getContentResolver().openInputStream(uri), null, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
int scaleFactor = Math.min(photoW / targetW, photoH / targetH);
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
return BitmapFactory.decodeStream(ctx.getContentResolver()
.openInputStream(uri), null, bmOptions);
}
}