Implemented write perms requesting for each file session

android/src/io/anuke/mindustry/AndroidLauncher.java

@@ -76,6 +76,15 @@ public class AndroidLauncher extends AndroidApplication{
 			public void openDonations() {
 				showDonations();
 			}
+
+			@Override
+			public void requestWritePerms() {
+				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+					if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
+						requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, WRITE_REQUEST_CODE);
+					}
+				}
+			}
 		};
 
 		if(doubleScaleTablets && isTablet(this.getContext())){

core/src/io/anuke/mindustry/Mindustry.java

@@ -30,6 +30,7 @@ public class Mindustry extends ModuleCore {
 		@Override public void onSceneChange(String state, String details, String icon) {}
 		@Override public void onGameExit() {}
 		@Override public void openDonations() {}
+		@Override public void requestWritePerms() {}
 	};
 	public static OrderedMap<String, Integer> idMap = new OrderedMap<>();
 

core/src/io/anuke/mindustry/io/PlatformFunction.java

@@ -12,4 +12,5 @@ public interface PlatformFunction{
 	public void onSceneChange(String state, String details, String icon);
 	public void onGameExit();
 	public void openDonations();
+	public void requestWritePerms();
 }

core/src/io/anuke/mindustry/ui/FileChooser.java

@@ -6,25 +6,17 @@ import com.badlogic.gdx.graphics.g2d.GlyphLayout;
 import com.badlogic.gdx.utils.Align;
 import com.badlogic.gdx.utils.Array;
 import com.badlogic.gdx.utils.Pools;
-
-import java.util.Arrays;
-
 import io.anuke.mindustry.Mindustry;
 import io.anuke.ucore.core.Core;
 import io.anuke.ucore.function.Consumer;
 import io.anuke.ucore.function.Predicate;
 import io.anuke.ucore.scene.event.Touchable;
-import io.anuke.ucore.scene.ui.ButtonGroup;
+import io.anuke.ucore.scene.ui.*;
-import io.anuke.ucore.scene.ui.Dialog;
-import io.anuke.ucore.scene.ui.Image;
-import io.anuke.ucore.scene.ui.ImageButton;
-import io.anuke.ucore.scene.ui.Label;
-import io.anuke.ucore.scene.ui.ScrollPane;
-import io.anuke.ucore.scene.ui.TextButton;
-import io.anuke.ucore.scene.ui.TextField;
 import io.anuke.ucore.scene.ui.layout.Table;
 import io.anuke.ucore.scene.ui.layout.Unit;
 
+import java.util.Arrays;
+
 public class FileChooser extends FloatingDialog{
 	private Table files;
 	private FileHandle homeDirectory = Gdx.files.absolute(Gdx.files.getExternalStoragePath());
@@ -47,6 +39,10 @@ public class FileChooser extends FloatingDialog{
 		this.filter = filter;
 		this.selectListener = result;
 		setupWidgets();
+
+		if(!open){
+			Mindustry.platforms.requestWritePerms();
+		}
 	}
 
 	private void setupWidgets(){

desktop/src/io/anuke/mindustry/desktop/DesktopLauncher.java

@@ -60,11 +60,9 @@ public class DesktopLauncher {
 				}
 			}
 
-			@Override
+			@Override public void addDialog(TextField field){}
-			public void addDialog(TextField field){}
+			@Override public void openDonations(){}
-
+			@Override public void requestWritePerms() {}
-			@Override
-			public void openDonations(){}
 
 			@Override
 			public void onSceneChange(String state, String details, String icon) {

html/src/io/anuke/mindustry/client/HtmlLauncher.java

@@ -110,17 +110,11 @@ public class HtmlLauncher extends GwtApplication {
 				Window.open(link, "_blank", "");
 			}
 
-			@Override
+            @Override public void onSceneChange(String state, String details, String icon) {}
-			public void addDialog(TextField field){}
+            @Override public void onGameExit() {}
-
+            @Override public void addDialog(TextField field){}
-            @Override
+            @Override public void openDonations(){}
-            public void onSceneChange(String state, String details, String icon) {}
+            @Override public void requestWritePerms() {}
-
-            @Override
-            public void onGameExit() {}
-
-            @Override
-            public void openDonations() {}
         };
         
         return new Mindustry();