意图相机

Question

我制作了一个可以将图像更新到服务器的应用程序。有2个选项：从相机拍照并从图库中选择。该代码适用于“从库中选择”选项，当我单击“拍照”时，这些报告将导致应用程序崩溃。 如何处理呢？ 我的捕获图像意图代码：

capture.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            captureImage();
        }
    });


private void captureImage() {
    Intent intentCap = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    intentCap.setType("image/*");
    startActivityForResult(intentCap, 0);
}

error

Answer 1

似乎Android无法找到合适的Intent。

尝试此意图：

try{
   Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
   startActivityForResult(cameraIntent, CAMERA_REQUEST);
} catch (ActivityNotFoundException e) {
// show message to user 
}

Answer 2

在调用第三方此类意图时，应始终检查 resolveActivity 。

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

引用this

Answer 3

首先要检查您是否已在清单文件中添加了必需的权限，然后测试您的应用程序。即使该应用程序之后没有运行，也可能由于以下原因而发生： 1）您的设备上可能没有相机 2）手机中没有SD卡

在这种情况下，您可以参考以下链接，这些链接描述了类似问题link 1和link 2

的解决方案

Answer 4

很有可能您必须忘记添加运行时权限以访问Camera API ，从而在尝试打开相机时导致应用崩溃。下面是代码片段，您可以用来执行相同的操作：

public void showCamera(View view) {

        // BEGIN_INCLUDE(camera_permission)
        // Check if the Camera permission is already available.
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
            // Camera permission has not been granted.

            requestCameraPermission();

        } else {

            // Camera permissions is already available, show the camera preview.
            Log.i(TAG,
                    "CAMERA permission has already been granted. Displaying camera preview.");
            showCameraPreview();
        }
        // END_INCLUDE(camera_permission)

    }

private void requestCameraPermission() {

        // BEGIN_INCLUDE(camera_permission_request)
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission.CAMERA)) {
            // Provide an additional rationale to the user if the permission was not granted
            // and the user would benefit from additional context for the use of the permission.
            // For example if the user has previously denied the permission.

        } else {

            // Camera permission has not been granted yet. Request it directly.
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
                    REQUEST_CAMERA);
        }
        // END_INCLUDE(camera_permission_request)
}

Here is Google Runtime Permission Model Video有一个更好的理解。

Also check official documentation了解更多详情。

希望这会有所帮助。