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package com.mapbox.mapboxsdk.utils;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import java.io.File;
import java.lang.ref.WeakReference;
public class FileUtils {
/**
* Task checking whether app's process can read a file.
*/
public static class CheckFileReadPermissionTask extends AsyncTask<File, Void, Boolean> {
@NonNull
private final WeakReference<OnCheckFileReadPermissionListener> listenerWeakReference;
public CheckFileReadPermissionTask(OnCheckFileReadPermissionListener listener) {
this.listenerWeakReference = new WeakReference<>(listener);
}
@Override
protected Boolean doInBackground(File... files) {
try {
return files[0].canRead();
} catch (Exception ex) {
return false;
}
}
@Override
protected void onCancelled() {
OnCheckFileReadPermissionListener listener = listenerWeakReference.get();
if (listener != null) {
listener.onError();
}
}
@Override
protected void onPostExecute(Boolean result) {
OnCheckFileReadPermissionListener listener = listenerWeakReference.get();
if (listener != null) {
if (result) {
listener.onReadPermissionGranted();
} else {
listener.onError();
}
}
}
}
/**
* Interface definition for a callback invoked when checking file's read permissions.
*/
public interface OnCheckFileReadPermissionListener {
/**
* Invoked when app's process has a permission to read a file.
*/
void onReadPermissionGranted();
/**
* Invoked when app's process doesn't have a permission to read a file or an error occurs.
*/
void onError();
}
/**
* Task checking whether app's process can write to a file.
*/
public static class CheckFileWritePermissionTask extends AsyncTask<File, Void, Boolean> {
@NonNull
private final WeakReference<OnCheckFileWritePermissionListener> listenerWeakReference;
public CheckFileWritePermissionTask(OnCheckFileWritePermissionListener listener) {
this.listenerWeakReference = new WeakReference<>(listener);
}
@Override
protected Boolean doInBackground(File... files) {
try {
return files[0].canWrite();
} catch (Exception ex) {
return false;
}
}
@Override
protected void onCancelled() {
OnCheckFileWritePermissionListener listener = listenerWeakReference.get();
if (listener != null) {
listener.onError();
}
}
@Override
protected void onPostExecute(Boolean result) {
OnCheckFileWritePermissionListener listener = listenerWeakReference.get();
if (listener != null) {
if (result) {
listener.onWritePermissionGranted();
} else {
listener.onError();
}
}
}
}
/**
* Interface definition for a callback invoked when checking file's write permissions.
*/
public interface OnCheckFileWritePermissionListener {
/**
* Invoked when app's process has a permission to write to a file.
*/
void onWritePermissionGranted();
/**
* Invoked when app's process doesn't have a permission to write to a file or an error occurs.
*/
void onError();
}
}
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