Question

我正在尝试制作一个简单的应用：我做了一个按钮，它的onClick应该调用相机意图，将图片保存在内部存储中，然后我想将图片放在自定义列表视图库...现在我还没有制作列表视图，因为我有意图的问题。相机无法打开，我不知道为什么即使权限在清单文件中

任何帮助表示赞赏，我已经尝试了很多教程，但我找不到问题。

public class MainActivity extends Activity implements View.OnClickListener {

public static final String LOG_TAG = "LOG_TAG" ;
public static final int CAMERA_REQUEST = 1; /* ci serve la richiesta per la camera*/
private Button btCamera;
private Button btSavePicture;
private ImageView imageViewShowPicture;
private File imageFile;

/*attributi per salvare foto*/

private String savePicturePath;

/*_____________________________________________________________________________________________oncreate*/
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    /*Collego oggetti alla grafica*/
    btCamera = (Button)this.findViewById(R.id.btCamera);
    btSavePicture = (Button) this.findViewById(R.id.btSalvaFoto);
    this.imageViewShowPicture = (ImageView) this.findViewById(R.id.ivMostraFoto);

    /*listener*/
    btCamera.setOnClickListener(this);
    btSavePicture.setOnClickListener(this);
}

/*___________________________________________________________________________________________metodo TAKE A PHOTO*/

private void startTakeAPictureIntent(){
    Intent takeAPictureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File

        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                    Uri.fromFile(photoFile));
            startActivityForResult(takePictureIntent, CAMERA_REQUEST);
        }
    }}

/*___________________________________________________________________________________________metodo crea image file*/

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    savePicturePath = "file:" + image.getAbsolutePath();
    return image;
}

/*______________________________________________________________________________________metodo aggiungi alla gallery*/
private void addPicToGallery() {
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    File f = new File(savePicturePath);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    this.sendBroadcast(mediaScanIntent);
}

/*______________________________________________________________________________________metodo decodificare un'immagine scalata*/
private void setPic() {
    // Get the dimensions of the View
    int targetW = imageViewShowPicture.getWidth();
    int targetH = imageViewShowPicture.getHeight();

    // Get the dimensions of the bitmap
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(savePicturePath, bmOptions);
    int photoW = bmOptions.outWidth;
    int photoH = bmOptions.outHeight;

    // Determine how much to scale down the image
    int scaleFactor = Math.min(photoW/targetW, photoH/targetH);

    // Decode the image file into a Bitmap sized to fill the View
    bmOptions.inJustDecodeBounds = false;
    bmOptions.inSampleSize = scaleFactor;
    bmOptions.inPurgeable = true;

    Bitmap bitmap = BitmapFactory.decodeFile(savePicturePath, bmOptions);
    imageViewShowPicture.setImageBitmap(bitmap);
}

/*_____________________________________________________________________________________________onclick*/
@Override
public void onClick(View v) {
    switch (v.getId()){
       case R.id.btCamera: {
            Log.d(LOG_TAG, "Ho premuto btcamera");
            Toast.makeText(MainActivity.this, "Camera clicked", Toast.LENGTH_SHORT).show();

           startTakeAPictureIntent();

            /*Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(cameraIntent, RICHIESTA_FOTOCAMERA);*/

        } break;
        case R.id.btSalvaFoto:{
            Log.d(LOG_TAG, "Ho premuto btsalvafoto");
            Toast.makeText(MainActivity.this, "salvafoto clicked", Toast.LENGTH_SHORT).show();
        }
    }
}

/*_____________________________________________________________________________________________onActivity result*/

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) { /* se la richiesta mi da risultati*/
        Bundle extras = data.getExtras();
        Bitmap immagineBitmap = (Bitmap)extras.get("data"); /* prendi gli extra */
        imageViewShowPicture.setImageBitmap(immagineBitmap); /*setto la imageview per mostrarla*/
    }

}

} // chiude活动

Answer 1

请尝试添加以下权限并查看。

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

请参阅https://developer.android.com/guide/topics/media/camera.html#manifest以查看您需要声明的其他内容。

Android - 拍照无效

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