I am developing an android app in which it is required to provide permission for Read and write external storage. My requirement is to select a picture from gallery and use it in my app. Everything is working fine except Marshmallow devices. I want to provide permission for Marshmallow. Can anyone help me with this?
6 Answers
For writing a file in storage, First,need to add write permission in manifest.xml,
Then, In Android 6, it contains a permission system for certain tasks. Each application can request the required permission on runtime. So let’s open Activity class add below code for requesting runtime permission.
check your application has a runtime write permission using,
override fun onRequestPermissionsResult(requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray) {
when(requestCode) {
100 -> {
if (grantResults.size > 0 && permissions[0] == Manifest.permission.WRITE_EXTERNAL_STORAGE) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
}
}
}
}
}
Check AndroidManifest.xml!!
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.yoganetwork">
<!-- Internet Permission -->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission
android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.YogaNetwork">
<activity android:name=".LoginActivity"></activity>
<activity android:name=".DashboardActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"
/>
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".RegisterActivity" />
<activity android:name=".MainActivity" />
</application>
</manifest>
In addition, if you want to ask for multiple permissions. You can do this.
private ArrayList<String> permisos;
private void someMethod()
{
..
verificarPermisos(Manifest.permission.READ_EXTERNAL_STORAGE );
verificarPermisos(Manifest.permission.ACCESS_FINE_LOCATION );
verificarPermisos(Manifest.permission.ACCESS_COARSE_LOCATION );
if (permisos.size()!=0)
{
solicitarPermisos(permisos.toArray(new String[permisos.size()]));
}
..
}
@TargetApi(23)
void verificarPermisos(String permiso){
if (ContextCompat.checkSelfPermission(this,permiso)
!= PackageManager.PERMISSION_GRANTED) {
permisos.add(permiso);
// Should we show an explanation?
if (shouldShowRequestPermissionRationale(permiso)) {
}
}
}
@TargetApi(23)
void solicitarPermisos(String[] permiso){
requestPermissions(permiso, 1);
}
First, I check if the permission is already granted or not with "verificarPermisos()" method. If they are not granted, I add them to "permisos" arraylist. Finally, the ungranted permissions are resquested passing them in a String[] array format.
Note that you can only request permissions since MashMellow(API 23) or higher. So, if your app is also targetting android versions before MashMellow you could use the "@TargetApi()" annotation and the permission methods only be called when the target is API 23 or higher.
Hope to help, greetings.
Checking every situation
if denied - showing Alert dialog to user why we need permission
public static final int STORAGE_PERMISSION_REQUEST_CODE= 1;
private void askPermissions() {
int permissionCheckStorage = ContextCompat.checkSelfPermission(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE);
// we already asked for permisson & Permission granted, call camera intent
if (permissionCheckStorage == PackageManager.PERMISSION_GRANTED) {
//do what you want
} else {
// if storage request is denied
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("You need to give permission to access storage in order to work this feature.");
builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
builder.setPositiveButton("GIVE PERMISSION", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
// Show permission request popup
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
STORAGE_PERMISSION_REQUEST_CODE);
}
});
builder.show();
} //asking permission for first time
else {
// Show permission request popup for the first time
ActivityCompat.requestPermissions(AddWorkImageActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
STORAGE_PERMISSION_REQUEST_CODE);
}
}
}
Checking Permission Results
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case STORAGE_PERMISSION_REQUEST_CODE:
if (grantResults.length > 0 && permissions[0].equals(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
// check whether storage permission granted or not.
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//do what you want;
}
}
break;
default:
break;
}
}
you can just copy and paste this code, it works fine. change context(this) & permissions according to you.
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