将相机与 android 一起使用

Question

我正在尝试将相机与我的应用程序一起使用，但是当我按下按钮时应用程序崩溃并且在 Android 监视器中出现以下消息：

java.lang.SecurityException: Permission Denial: starting Intent { 
act=android.media.action.IMAGE_CAPTURE 
cmp=com.android.camera2/com.android.camera.CaptureActivity } from 
ProcessRecord{bd3e6b7 4753:com.demonsystem.trackingticket/u0a94} (pid=4753, 
uid=10094) with revoked permission android.permission.CAMERA

这是我主要的代码 activity:

btnCamara.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(i,0); <-- here shows the error
                ocultar();
            }
        });

这些是权限：

private void checkCameraPermission() {
        int permissionCheck = ContextCompat.checkSelfPermission(
                this, Manifest.permission.CAMERA);
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            Log.i("Mensaje", "No se tiene permiso para la camara!.");
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 225);
        } else {
            Log.i("Mensaje", "Tienes permiso para usar la camara.");
        }
    }

这些是我在清单中写的用途：

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

Answer 1

btnCamara.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick (View view){
    if (hasPermissionUseCamera()) {
        Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(i, 0); 
        ocultar();
    }
  }
}

public boolean hasPermissionUseCamera() {
    if (Build.VERSION.SDK_INT >= 23) {
        if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
            return true;
        } else {
            requestPermissions(new String[]{Manifest.permission.CAMERA}, 0);
            return false;
        }
    } else { //permission is automatically granted on sdk<23 upon installation
        return true;
    }
}

@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

    switch (requestCode) {
        case 0: {
            if (getActivity().checkSelfPermission(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
                Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(i, 0); 
                ocultar();
            } else {
                Toast.makeText(getActivity(), "Access Denied", Toast.LENGTH_SHORT).show();
            }
            break;
        }
    }
}

Answer 2

在触发 Image_Capture 操作之前，只需检查您的应用是否具有权限。

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