我试图在Android中创建一个文件,甚至在遵循所有其他答案之后,我仍然无法获得许可. saveImage()方法中发生错误.
// STATICS
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE
};
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState)
verifyStoragePermissions(this);
}
//HERE IS THE METHOD THAT ASKS FOR PERMISSIONS
public static void verifyStoragePermissions(Activity activity) {
// Check if we have write permission
int permission = ActivityCompat.checkSelfPermission(activity,Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permission != PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(
activity,PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE
);
}
}
@Override //ON REQUEST PERMISSION RESULT,//I ACCEPTED THE PERMISSION,THE CODE HERE WAS EXECUTED AS IT SHOULD
public void onRequestPermissionsResult(int requestCode,String permissions[],int[] grantResults) {
switch (requestCode) {
case 1: {
Log.d(TAG,"THIS IS FOR THE WRITE/READ PERMISSIONS");
Log.d(TAG,grantResults.toString());
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Log.d(TAG,"[Persmission accepted for writing/reading]");
// permission was granted,yay! Do the
// camera related task you need to do.
} else {
Log.d(TAG,"[Permission denied]");
// permission denied,boo! disable the
// functionality that depends on this permission.
}
}
// other 'case' lines to check for other
// permissions this app might request.
}
}
//THE METHOD WHERE THE ERROR HAPPENS
public String saveImage(Bitmap myBitmap) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
myBitmap.compress(Bitmap.CompressFormat.JPEG,90,bytes);
File wallpaperDirectory = new File(
Environment.getExternalStorageDirectory() + "TEST_APP_PHOTO_FOLDER");
// have the object build the directory structure,if needed.
if (!wallpaperDirectory.exists()) {
wallpaperDirectory.mkdirs();
}
try {
File f = new File(wallpaperDirectory + "testfile.jpg");
f.mkdirs();
f.createNewFile(); // <--- STACK TRACE POINTS HERE
FileOutputStream fo = new FileOutputStream(f);
..
..
..
该错误发生在saveImage()方法中.我有评论解释发生的地方.我已经尝试过使用f.mkdirs()的方法,但是如果没有它,则将无法正常工作.权限两次均被拒绝.
堆栈跟踪
java.io.IOException: Permission denied
at java.io.UnixFileSystem.createFileExclusively0(Native Method)
at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:281)
at java.io.File.createNewFile(File.java:1000)
at car.andrej.Tradingapp.ProfileActivity.ProfileActivity.saveImage(ProfileActivity.java:263)
at car.andrej.Tradingapp.ProfileActivity.ProfileActivity.onActivityResult(ProfileActivity.java:220)
at android.app.Activity.dispatchActivityResult(Activity.java:7556)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4487)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4534)
at android.app.ActivityThread.-wrap20(UnkNown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1752)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
在清单中：
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
我想念什么？…
最佳答案
这不是Android权限问题.相反,该异常是由于Linux权限造成的,尽管是无意间造成的.
实例化saveImage()中使用的文件时,您要将新文件/目录的名称连接到Environment.getExternalStorageDirectory();.例如,对于wallpaperDirectory：
new File(Environment.getExternalStorageDirectory() + "TEST_APP_PHOTO_FOLDER")
这是在Environment.getExternalStorageDirectory()上隐式调用toString()并直接在其后附加名称,而无需使用必需的路径分隔符,因此最终得到的全名类似于/ storage / emulated / 0TEST_APP_PHOTO_FOLDER.这是指外部存储目录的父目录中的文件,并且您在那里没有写访问权,因此是Exception.
只需更改您的File实例以使用带有单独File和String参数的构造函数；第一个用于父目录,第二个用于名称.基本上,将加号更改为逗号.例如：
new File(Environment.getExternalStorageDirectory(),"TEST_APP_PHOTO_FOLDER")
