我正在创建一个简单的应用程序来拍照。这是我的代码
Button b1;
ImageView iv;
String TAG = "MAIN ACTIVITY";
File photo;
private Uri mImageUri;
private File createTemporaryFile(String part, String ext) throws Exception {
File externalStorageDirectory = Environment.getExternalStorageDirectory();
File tempDir = new File(externalStorageDirectory + "/cameratest/");
if (!tempDir.exists()) {
tempDir.mkdir();
}
return File.createTempFile(part, ext, tempDir);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button);
iv = (ImageView) findViewById(R.id.imageView);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
try {
// place where to store camera taken picture
photo = createTemporaryFile("picture", ".jpg");
photo.delete();
} catch (Exception e) {
Log.v(TAG, "Can't create file to take picture!");
Toast.makeText(getApplicationContext(), "Please check SD card! Image shot is impossible!",
Toast.LENGTH_SHORT).show();
}
mImageUri = Uri.fromFile(photo);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
startActivityForResult(intent, 0);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0 && resultCode == RESULT_OK) {
Log.d(TAG, mImageUri.toString());
Bitmap bitmap = BitmapFactory.decodeFile(mImageUri.toString());
iv.setImageBitmap(bitmap);
}
}
如你所见,我添加了eLog.d(TAG, mImageUri.toString());
在最后和 logcat 中(以及FileNotFoundException
)我看到这个目录:
03-27 00:43:30.498 30526-30526/myapplication.example.falcoleo.cameratest1 D/MAIN ACTIVITY: file:///storage/emulated/0/cameratest/picture459838058.jpg
03-27 00:43:30.499 30526-30526/myapplication.example.falcoleo.cameratest1 E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: file:/storage/emulated/0/cameratest/picture459838058.jpg: open failed: ENOENT (No such file or directory)
猜猜这个目录是否存在?剧透警报, it does。而且图像并不是在之后创建的BitmapFactory.decodeFile
。我真的不明白我做错了什么。一切工作正常,除了当它实际上必须显示照片时,它只是不显示它。只是空白。就像 WTF m8 一样,我只是想做好我的工作,没必要发疯,你知道。