如何捕捉图像,并将其与原生的Android相机店
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27-09-2019 - |
题
我有一个问题捕获图像,并从本地相机应用存储它。下面是一些我的代码示例。
_path = Environment.getExternalStorageDirectory() + "make_machine_example.jpg";
File file = new File( _path );
Uri outputFileUri = Uri.fromFile( file );
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );
startActivityForResult( intent, 0 );
图片已采取,我返回到我原来的活动,当我浏览到使用Android DDMS文件浏览器我的SD卡后的图片是不存在的。任何人都知道这是为什么不被保存?
解决方案
你检查什么Environment.getExternalStorageDirectory()的输出,因为如果它不包含尾随文件分隔符(/),那么你的形象就会在不驻留在SD卡,如目录中结束:
/mnt/sdcardmake_machine_example.jpg
当你真正想要的是:
/mnt/sdcard/make_machine_example.jpg
试试这个代码,而不是:
_path = Environment.getExternalStorageDirectory() + File.separator + "make_machine_example.jpg";
其他提示
下面是在任何情况下最终的产品仍访问该螺纹:
public class CameraCapture extends Activity {
protected boolean _taken = true;
File sdImageMainDirectory;
protected static final String PHOTO_TAKEN = "photo_taken";
@Override
public void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
File root = new File(Environment
.getExternalStorageDirectory()
+ File.separator + "myDir" + File.separator);
root.mkdirs();
sdImageMainDirectory = new File(root, "myPicName");
startCameraActivity();
}
} catch (Exception e) {
finish();
Toast.makeText(this, "Error occured. Please try again later.",
Toast.LENGTH_SHORT).show();
}
}
protected void startCameraActivity() {
Uri outputFileUri = Uri.fromFile(sdImageMainDirectory);
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(intent, 0);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (resultCode) {
case 0:
finish();
break;
case -1:
try {
StoreImage(this, Uri.parse(data.toURI()),
sdImageMainDirectory);
} catch (Exception e) {
e.printStackTrace();
}
finish();
startActivity(new Intent(CameraCapture.this, Home.class));
}
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
if (savedInstanceState.getBoolean(CameraCapture.PHOTO_TAKEN)) {
_taken = true;
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putBoolean(CameraCapture.PHOTO_TAKEN, _taken);
}
public static void StoreImage(Context mContext, Uri imageLoc, File imageDir) {
Bitmap bm = null;
try {
bm = Media.getBitmap(mContext.getContentResolver(), imageLoc);
FileOutputStream out = new FileOutputStream(imageDir);
bm.compress(Bitmap.CompressFormat.JPEG, 100, out);
bm.recycle();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
1。只是使用
new File(Environment.getExternalStorageDirectory(), "make_machine_example.jpg");
和不打扰约分隔符。
2。之前遇到了同样的问题。 SenseUI手机有不创建文件的自定义相机应用。什么设备是您使用?它可能已经被固定在最新的设备,但它也可能仍然是一个问题。所以这里有一个完整的样本如何克服它保存照片问题一个文件。
您应该保存图像之后执行媒体扫描
sendBroadcast(new Intent(
Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" + Environment.getExternalStorageDirectory())));
添加此行进AndroidManifest.xml文件和移除的额外make_machine_example:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
它将开始捕捉照片和存储到SD卡的
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