我在为我的Android程序创建新目录时遇到困难,但它没有处理我的stream
方法。
这是我在MainActivity中的OnClick方法:
public void savnshare(View v){
if (mBitmap == null){
return;
}
File path = new File(Environment.getExternalStorageDirectory() + "/Bill");
path.mkdirs(); //Result of 'File.mkdirs()' is ignored
Random rand = new Random();
int n = rand.nextInt(20);
String filename = "bill_"+n+".jpeg";
File file = new File(path, filename);
FileOutputStream stream;
try{
stream = new FileOutputStream(file);
mback.compress(Bitmap.CompressFormat.JPEG, 100, stream);
stream.close();
}catch (Exception e){
Toast.makeText(getApplicationContext(),"errr try again...",Toast.LENGTH_SHORT).show();
}
Uri uri = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.setType("image/*");
intent.putExtra(Intent.ACTION_SENDTO, uri);
Intent.createChooser(intent, "Share via...");
startActivity(intent);
}
我使用的权限:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission-sdk-23 android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
谢谢。
答案 0 :(得分:4)
您正在使用M设备进行构建。所以你需要事先获得写入SD卡的许可。
这里的代码 -
private static final int REQUEST_WRITE_STORAGE = 112;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash_board);
boolean hasPermission = (ContextCompat.checkSelfPermission(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
if (!hasPermission) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
REQUEST_WRITE_STORAGE);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode)
{
case REQUEST_WRITE_STORAGE: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
//reload my activity with permission granted or use the features what required the permission
} else
{
Toast.makeText(this, "The app was not allowed to write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
}
}
}
}