Android 打开相机权限被拒绝

Question

我想在单击对话框上的项目时打开相机，但出现如下错误。我一直在为manifest.xml 添加摄像头权限。

java.lang.SecurityException: Permission Denial: 从 ProcessRecord{b42fcde 29884:ukmutilizer.project.com.ukm_utilizer 开始 Intent { act=android.media.action.IMAGE_CAPTURE cmp=com.sonyericsson.android.camera/.MultiWindowActivity } /u0a273} (pid=29884, uid=10273) 已撤销权限 android.permission.CAMERA

这是我的功能

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.personal_data_step, container, false);
    ButterKnife.bind(this, view);

    imageEktp.setClickable(true);

    imageEktp.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //Log.d("test : ", "testing");
            CharSequence menu[] = new CharSequence[]{"Take From Galery", "Open Camera"};
            AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
            builder.setTitle("Pick a Picture");
            builder.setItems(menu, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    if(i == 0){
                        Toast.makeText(getActivity(), "galery", Toast.LENGTH_SHORT).show();
                    }else{
                        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                        startActivity(intent);
                    }
                }
            });
            builder.show();
        }
    });

    return view;
}

Answer 1

您必须获得运行时权限，然后才能访问您的相机

喜欢

在清单中

<uses-permission android:name="android.permission.CAMERA" />

在 Java 中

private static final int MY_CAMERA_REQUEST_CODE = 100;

     private void processPickImage() {
                if(hasCameraPermission()) {
                    pickImage();
                }
                else
                {
                    requestCameraPermission();
                }            
        }

        private boolean hasCameraPermission() {
            return ContextCompat.checkSelfPermission(context,
                    Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
        }

        @TargetApi(Build.VERSION_CODES.M)
        private void requestCameraPermission() {
            requestPermissions(new String[]{Manifest.permission.CAMERA},
                    MY_CAMERA_REQUEST_CODE );
        }

        @Override
        public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                               @NonNull int[] grantResults) {
            switch (requestCode) {
                case MY_CAMERA_REQUEST_CODE :

                    processPickImage();
                    break;
                default:
                    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            }
        }

Answer 2

用户必须确认权限请求。
试试

public class ActivityMain extends AppCompatActivity
{

    public static final int MY_PERMISSIONS_REQUEST = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        if (ContextCompat.checkSelfPermission(ActivityMain.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
        {   ActivityCompat.requestPermissions(ActivityMain.this, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST);
        }

[...]

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
    {   switch (requestCode)
        {   case MY_PERMISSIONS_REQUEST:

[...]
        }
    }
}

Answer 3

确保您向用户请求运行时Camera Permission。

private static final int CAMERA_REQUEST_CODE = 100;

如果未获得许可，请请求许可。

if (checkSelfPermission(Manifest.permission.CAMERA)
                        != PackageManager.PERMISSION_GRANTED) {
       requestPermissions(new String[]{Manifest.permission.CAMERA},
                            CAMERA_REQUEST_CODE);
}

在onRequestPermissionsResult里面做点什么。

@Override

    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == CAMERA_REQUEST_CODE) {

            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                Toast.makeText(this, "Camera permission granted.", Toast.LENGTH_LONG).show();

               // Do stuff here for Action Image Capture.

            } else {

                Toast.makeText(this, "Camera permission denied.", Toast.LENGTH_LONG).show();

            }

        }
    }

这也应该在Manifest 中声明。

Answer 4

当您像棉花糖设备一样在 6.0 以上运行您的应用程序时，则需要许可，否则不需要许可。 那个时候你的代码工作..

如果运行 marshmallow 设备时需要权限，则制作以下代码 ..

private void alertDialog(){
    CharSequence menu[] = new CharSequence[]{"Take From Galery", "Open Camera"};
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Pick a Picture");
    builder.setItems(menu, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            if(i == 0){
                Toast.makeText(getApplicationContext(), "galery", Toast.LENGTH_SHORT).show();
            }else{
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                startActivity(intent);
            }
        }
    });
    builder.show();

}

然后上面的方法放入权限代码如下..

if (ContextCompat.checkSelfPermission(webView.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                if (ActivityCompat.shouldShowRequestPermissionRationale(webView.this, Manifest.permission.CAMERA)) {

                    alertDialog();
                }
                else{
                    ActivityCompat.requestPermissions(webView.this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
                }
            }

在清单文件中添加两个权限..

    <uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

如果您在下面添加此行，则您的错误主要问题是权限。

if (ContextCompat.checkSelfPermission(webView.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                if (ActivityCompat.shouldShowRequestPermissionRationale(webView.this, Manifest.permission.CAMERA)) {

                    alertDialog();
                }
                else{
                    ActivityCompat.requestPermissions(webView.this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
                }
            }