Java 使用摄像头扫描二维码导致应用程序崩溃|可能修复？
我正在尝试使用设备摄像头和移动视觉API扫描二维码。为此，我创建了一个Java 使用摄像头扫描二维码导致应用程序崩溃|可能修复？,java,android,camera,Java,Android,Camera,我正在尝试使用设备摄像头和移动视觉API扫描二维码。为此，我创建了一个SurfaceView，将图像流提取到SurfaceView，并启用了条码检测器，然后使用所需的方法读取检测到的二维码。以下是活动的代码： QrScanActivity.class public class QrScanActivity extends AppCompatActivity { private SurfaceView cameraView; private TextView barcodeInfo
SurfaceViewSurfaceView条码检测器public class QrScanActivity extends AppCompatActivity
{
private SurfaceView cameraView;
private TextView barcodeInfo;
private BarcodeDetector barcodeDetector;
private CameraSource cameraSource;
private static final String TAG = "QR_ACTIVITY";
private static final int REQUEST_CAMERA = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qr_scan);
cameraView = (SurfaceView) findViewById(R.id.camera_view);
barcodeInfo = (TextView) findViewById(R.id.code_info);
barcodeDetector =
new BarcodeDetector.Builder(this)
.setBarcodeFormats(Barcode.QR_CODE)
.build();
cameraSource = new CameraSource
.Builder(this, barcodeDetector)
.setRequestedPreviewSize(640, 480)
.build();
cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (ActivityCompat.checkSelfPermission(QrScanActivity.this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
requestCameraPermission();
}
try {
cameraSource.start(cameraView.getHolder());
} catch (IOException ie) {
Log.e("CAMERA SOURCE", ie.getMessage());
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> barcodes = detections.getDetectedItems();
if (barcodes.size() != 0) {
barcodeInfo.post(new Runnable() { // Use the post method of the TextView
public void run() {
barcodeInfo.setText( // Update the TextView
barcodes.valueAt(0).displayValue
);
}
});
}
}
});
}
private void requestCameraPermission() {
Log.i("CAM","CAMERA permission has NOT been granted. Requesting permission.");
// BEGIN_INCLUDE(camera_permission_request)
if (ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.CAMERA))
{
Snackbar.make(findViewById(android.R.id.content), R.string.permission_camera_rationale,
Snackbar.LENGTH_INDEFINITE)
.setAction(R.string.ok, new View.OnClickListener() {
@Override
public void onClick(View view) {
ActivityCompat.requestPermissions(QrScanActivity.this,
new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA);
}
})
.show();
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA);
}
// END_INCLUDE(camera_permission_request)
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
if (requestCode == REQUEST_CAMERA)
{
Log.i(TAG, "Received response for Camera permission request.");
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Log.i(TAG, "CAMERA permission has now been granted. Showing preview.");
Snackbar.make(findViewById(android.R.id.content), R.string.permision_available_camera,
Snackbar.LENGTH_SHORT).show();
} else {
Log.i(TAG, "CAMERA permission was NOT granted.");
Snackbar.make(findViewById(android.R.id.content), R.string.permissions_not_granted,
Snackbar.LENGTH_SHORT).show();
}
}
else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
公共类QrScanActivity扩展了AppCompatActivity
{
私人水面观景摄像师；
私有文本视图条码信息；
专用条码检测器条码检测器；
私人摄像源摄像源；
私有静态最终字符串TAG=“QR\U活动”；
专用静态最终int请求\u摄像机=0；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u qr\u scan）；
cameraView=（SurfaceView）findViewById（R.id.camera\U视图）；
barcodeInfo=（TextView）findViewById（R.id.code\u信息）；
条形码检测器=
新条形码检测器.Builder（此）
.setBarcodeFormats（条形码.QR\U码）
.build（）；
cameraSource=新的cameraSource
.Builder（这是条形码检测器）
.setRequestedPreviewSize（640480）
.build（）；
cameraView.getHolder（）.addCallback（新的SurfaceHolder.Callback（））{
@凌驾
已创建的公共空白表面（表面持有人）{
if（ActivityCompat.checkSelfPermission（QrScanActivity.this、Manifest.permission.CAMERA）
！=PackageManager.权限（已授予）{
requestCameraPermission（）；
}
试一试{
cameraSource.start（cameraView.getHolder（））；
}捕获（IOIE）{
Log.e（“摄像机源”，即getMessage（））；
}
}
@凌驾
公共空白表面更改（表面文件夹持有者、整型格式、整型宽度、整型高度）{
}
@凌驾
公共空间表面覆盖（表面覆盖物持有人）{
cameraSource.stop（）；
}
});
条形码检测器.setProcessor（新检测器.Processor（）{
@凌驾
公开无效释放（）{
}
@凌驾
公共空隙接收检测（检测器。检测）{
最终SparseArray条形码=检测。getDetectedItems（）；
如果（条形码大小（）！=0）{
post（new Runnable（）{//使用TextView的post方法
公开募捐{
barcodeInfo.setText（//更新TextView
条形码.valueAt（0）.显示值
);
}
});
}
}
});
}
私有void requestCameraPermission（）{
Log.i（“CAM”，“尚未授予摄像头权限。正在请求权限”）；
//开始包括（摄像机许可请求）
if（ActivityCompat.shouldshowRequestPermissionRegulation（这是Manifest.permission.CAMERA））
{
Snackbar.make（findviewbyd（android.R.id.content）、R.string.permission\u camera\u原理、，
蛇形杆。长度（不确定）
.setAction（R.string.ok，new View.OnClickListener（）{
@凌驾
公共void onClick（视图）{
ActivityCompat.requestPermissions（QrScanActivity.this，
新字符串[]{Manifest.permission.CAMERA}，
请求（摄像头）；
}
})
.show（）；
}否则{
ActivityCompat.requestPermissions（这个新字符串[]{Manifest.permission.CAMERA}，
请求（摄像头）；
}
//结束包括（摄像机许可请求）
}
@凌驾
public void onRequestPermissionsResult（int-requestCode，@NonNull字符串[]权限，
@非空int[]grantResults）{
if（requestCode==请求\摄像机）
{
Log.i（标记“已收到照相机许可请求的响应”）；
if（grantResults.length==1&&grantResults[0]==PackageManager.PERMISSION\u已授予）{
Log.i（标记“相机权限已授予。显示预览”）；
Snackbar.make（findviewbyd（android.R.id.content）、R.string.permission\u available\u camera、，
Snackbar.LENGTH_SHORT）.show（）；
}否则{
Log.i（标记“未授予相机许可”）；
Snackbar.make（findviewbyd（android.R.id.content）、R.string.permissions\u not\u provided、，
Snackbar.LENGTH_SHORT）.show（）；
}
}
否则{
super.onRequestPermissionsResult（请求代码、权限、授权结果）；
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_qr_scan"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:layout_width="400dp"
android:layout_height="280dp"
android:layout_marginTop="30dp"
android:id="@+id/camera_view"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/code_info"
android:layout_below="@+id/camera_view"
android:textSize="20sp"
android:layout_marginTop="30dp"
android:layout_centerHorizontal="true"
android:text="Nothing to read."
/>
</RelativeLayout>
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, REQUEST_READ_CAMERA);
}
else {
// Already grant Camera permission. Now call your QR scan Activity
}
}else {
// call your QR scan Activity
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case REQUEST_READ_CAMERA: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission has granted . Call the QR scan Activity
} else {
// permission denied
}
return;
}
}
}
public class QrScanActivity extends AppCompatActivity
{
private SurfaceView cameraView;
private TextView barcodeInfo;
private BarcodeDetector barcodeDetector;
private CameraSource cameraSource;
private static final String TAG = "QR_ACTIVITY";
private static final int REQUEST_CAMERA = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qr_scan);
int permissionCheck = ContextCompat.checkSelfPermission(this,
Manifest.permission.CAMERA);
if(permissionCheck == PackageManager.PERMISSION_GRANTED)
initCameraSource
else
requestCameraPermission();
}
private void requestCameraPermission() {
Log.i("CAM","CAMERA permission has NOT been granted. Requesting permission.");
// BEGIN_INCLUDE(camera_permission_request)
if (ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.CAMERA))
{
Snackbar.make(findViewById(android.R.id.content), R.string.permission_camera_rationale,
Snackbar.LENGTH_INDEFINITE)
.setAction(R.string.ok, new View.OnClickListener() {
@Override
public void onClick(View view) {
ActivityCompat.requestPermissions(QrScanActivity.this,
new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA);
}
})
.show();
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA);
}
// END_INCLUDE(camera_permission_request)
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
if (requestCode == REQUEST_CAMERA)
{
Log.i(TAG, "Received response for Camera permission request.");
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Log.i(TAG, "CAMERA permission has now been granted. Showing preview.");
initCameraSource();
} else {
Log.i(TAG, "CAMERA permission was NOT granted.");
Snackbar.make(findViewById(android.R.id.content), R.string.permissions_not_granted,
Snackbar.LENGTH_SHORT).show();
}
}
else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private void initCameraSource(){
cameraView = (SurfaceView) findViewById(R.id.camera_view);
barcodeInfo = (TextView) findViewById(R.id.code_info);
barcodeDetector =
new BarcodeDetector.Builder(this)
.setBarcodeFormats(Barcode.QR_CODE)
.build();
cameraSource = new CameraSource
.Builder(this, barcodeDetector)
.setRequestedPreviewSize(640, 480)
.build();
cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (ActivityCompat.checkSelfPermission(QrScanActivity.this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
requestCameraPermission();
}
try {
cameraSource.start(cameraView.getHolder());
} catch (IOException ie) {
Log.e("CAMERA SOURCE", ie.getMessage());
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> barcodes = detections.getDetectedItems();
if (barcodes.size() != 0) {
barcodeInfo.post(new Runnable() { // Use the post method of the TextView
public void run() {
barcodeInfo.setText( // Update the TextView
barcodes.valueAt(0).displayValue
);
}
});
}
}
});
}
}