基本上我想要做的是创建一个简单的应用程序,它使用默认的摄像头应用程序拍照,然后我想在ImageView中的新活动中显示该图像,但是我什么都试过导致无法在ImageView中显示摄像机活动的结果
java.io.FileNotFoundException: /storage/emulated/0/imageToProcess.jpg: open failed: ENOENT (No such file or directory)
我已经包含了正确的权限(甚至太多)在清单:
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
,我也请求手动权限,如果需要在t中他的主要活动:
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.CAMERA}, 1);
}
if(checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
if(checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
}
}
所以我不认为这个问题是与读/写权限。
在我的主要活动的XML文件,我创建了一个按钮,一个onClick监听器调用下面的方法:
public void openCamera(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(Environment.getExternalStorageDirectory() + File.separator + "imageToProcess.jpg");
imgUri = Uri.fromFile(f);
intent.putExtra("imgUri", imgUri.toString());
startActivityForResult(intent, TAKE_PICTURE);
}
这是我定义为创建一个新的意图和传递的onActivityResult()方法URI到新的活动:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if(requestCode == TAKE_PICTURE && resultCode == Activity.RESULT_OK) {
Intent camResult = new Intent(this, ShowCameraResult.class);
camResult.putExtra("imgUri", imgUri.toString());
startActivity(camResult);
}
}
注:imgUri和TAKE_PICTURE在类的顶部定义为protected static final int TAKE_PICTURE = 1;
和private Uri imgUri;
最后,这里是我的ShowCameraResult活动
public class ShowCameraResult extends AppCompatActivity {
private Bitmap mImageBitmap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_camera_result);
ImageView imageView = (ImageView)findViewById(R.id.imageView);
String filePath = getIntent().getStringExtra("imgUri");
Log.d("ShowCameraResult", "directory: " + filePath);
try {
mImageBitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(filePath));
imageView.setImageBitmap(mImageBitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
的Log.d方法调用上述返回
ShowCameraResult: directory: file:///storage/emulated/0/imageToProcess.jpg
这使我相信,从摄像头的图像结果是不实际被保存到我的imageToProcess.jpg文件,但我可能是非常错误的,因为这是我工作的第一个真正的Android项目。
所以我的问题是:我哪里错了?
任何帮助非常感谢,谢谢!
测试设备上不是模拟器 –
@Dhara我在银河S5 – Austin
它对其他三星测试中的错误检测设备 –