set gravity for layout

app/build.gradle

@@ -6,7 +6,7 @@ android {
     defaultConfig {
         applicationId "com.hamedtaherpour.floatinglayout"
         minSdkVersion 19
-        targetSdkVersion 28
+        targetSdkVersion 21
         versionCode 1
         versionName "1.0"
     }

app/src/main/java/com/hamedtaherpour/floatinglayout/MainActivity.java

@@ -1,7 +1,12 @@
 package com.hamedtaherpour.floatinglayout;
 
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Build;
+import android.provider.Settings;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.view.Gravity;
 import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;
@@ -16,8 +21,15 @@ protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        floatingLayout = new FloatingLayout(this, R.layout.floating_layout, this);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            if (!Settings.canDrawOverlays(this)) {
+                // ask for setting
+                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName()));
+                startActivityForResult(intent, 25);
+            }
+        }
 
+        floatingLayout = new FloatingLayout(this, R.layout.floating_layout, new FLGravity(Gravity.LEFT | Gravity.CENTER, 50, 0), this);
         button = findViewById(R.id.btn_run);
         button.setOnClickListener(new View.OnClickListener() {
             @Override

app/src/main/res/layout/activity_main.xml

@@ -8,13 +8,13 @@
 
     <Button
         android:id="@+id/btn_run"
-        android:layout_width="wrap_content"
+        android:layout_width="150dp"
         android:layout_height="wrap_content"
         android:layout_gravity="center_horizontal"
         android:layout_marginTop="25dp"
         android:background="@color/colorAccent"
         android:padding="10dp"
-        android:text="@string/app_name"
+        android:text="Show"
         android:textColor="@android:color/white"
         android:textSize="25sp" />
 

floatinglayout/src/main/java/com/hamedtaherpour/floatinglayout/FLGravity.java

@@ -0,0 +1,40 @@
+package com.hamedtaherpour.floatinglayout;
+
+import java.io.Serializable;
+
+public class FLGravity implements Serializable {
+
+    private int gravity;
+    private int x;
+    private int y;
+
+    public FLGravity(int gravity, int x, int y) {
+        this.gravity = gravity;
+        this.x = x;
+        this.y = y;
+    }
+
+    public void setGravity(int gravity) {
+        this.gravity = gravity;
+    }
+
+    public void setX(int x) {
+        this.x = x;
+    }
+
+    public void setY(int y) {
+        this.y = y;
+    }
+
+    public int getGravity() {
+        return gravity;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+}

floatinglayout/src/main/java/com/hamedtaherpour/floatinglayout/FloatingLayout.java

@@ -4,12 +4,10 @@
 import android.support.annotation.LayoutRes;
 import android.view.View;
 
-import java.io.Serializable;
-
 
 public class FloatingLayout implements FloatingLayoutPresenter.IView {
 
-    public interface CallBack extends Serializable {
+    public interface CallBack {
         void onClickListener(int resourceId);
 
         void onCreateListener(View view);
@@ -23,8 +21,12 @@ public interface CallBack extends Serializable {
 
     public FloatingLayout(Context mContext, @LayoutRes int resource, CallBack callBack) {
         this.callBack = callBack;
+        presenter = new FloatingLayoutPresenter(mContext, callBack, resource, this, null);
+    }
 
-        presenter = new FloatingLayoutPresenter(mContext, callBack, resource, this);
+    public FloatingLayout(Context mContext, @LayoutRes int resource, FLGravity flGravity, CallBack callBack) {
+        this.callBack = callBack;
+        presenter = new FloatingLayoutPresenter(mContext, callBack, resource, this, flGravity);
     }
 
     public void create() {

floatinglayout/src/main/java/com/hamedtaherpour/floatinglayout/FloatingLayoutPresenter.java

@@ -16,19 +16,24 @@ public class FloatingLayoutPresenter {
     public @LayoutRes
     int resource;
     private IView mView;
+    private FLGravity flGravity;
 
-    public FloatingLayoutPresenter(Context mContext, FloatingLayout.CallBack callBack, int resource, IView mView) {
+    public FloatingLayoutPresenter(Context mContext, FloatingLayout.CallBack callBack, int resource, IView mView,FLGravity flGravity) {
         this.mContext = checkNull("Context can not be null", mContext);
         this.callBack = callBack;
         this.resource = resource;
         this.mView = mView;
+        this.flGravity = flGravity;
     }
 
     public void onCreate() {
         Intent intent = new Intent(mContext, FloatingLayoutService.class);
         intent.putExtra(FloatingLayoutService.LAYOUT_RESOURCE, resource);
         if (callBack != null)
             intent.putExtra(FloatingLayoutService.RECEIVER, new DownloadReceiver(new Handler()));
+        if (flGravity != null)
+            intent.putExtra(FloatingLayoutService.FL_GRAVITY, flGravity);
+
         mContext.startService(intent);
     }
 

floatinglayout/src/main/java/com/hamedtaherpour/floatinglayout/FloatingLayoutService.java

@@ -22,6 +22,7 @@ public class FloatingLayoutService extends Service implements View.OnClickListen
 
     public static final String LAYOUT_RESOURCE = "layout-resource";
     public static final String RECEIVER = "receiver";
+    public static final String FL_GRAVITY = "flgravity";
     public static final int ACTION_ON_CLICK = 3265;
     public static final int ACTION_ON_CREATE = 5874;
     public static final int ACTION_ON_CLOSE = 3625;
@@ -40,6 +41,7 @@ public class FloatingLayoutService extends Service implements View.OnClickListen
     int resource;
     private @IdRes
     int ROOT_CONTAINER_ID;
+    private FLGravity flGravity;
 
     @Override
     public IBinder onBind(Intent intent) {
@@ -60,6 +62,7 @@ public void onStart(Intent intent, int startId) {
         super.onStart(intent, startId);
         resource = intent.getIntExtra(LAYOUT_RESOURCE, 0);
         receiver = (ResultReceiver) intent.getParcelableExtra(RECEIVER);
+        flGravity = (FLGravity) intent.getSerializableExtra(FL_GRAVITY);
 
         onDestroyView();
         createView();
@@ -98,17 +101,11 @@ private void createView() {
                 WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                 PixelFormat.TRANSLUCENT);
 
-        params.gravity = Gravity.TOP | Gravity.LEFT;
-        params.x = 0;
-        params.y = 100;
-
         mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
         LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         mFloatingView = layoutInflater.inflate(resource, null);
-
-        params.gravity = Gravity.CENTER | Gravity.CENTER;
-        params.x = 0;
-        params.y = 0;
+        if (flGravity != null)
+            setGravity(params);
         mWindowManager.addView(mFloatingView, params);
 
         rootContainer = mFloatingView.findViewById(ROOT_CONTAINER_ID);
@@ -150,6 +147,12 @@ public boolean onTouch(View v, MotionEvent event) {
         receiver.send(ACTION_ON_CREATE, null);
     }
 
+    private void setGravity(WindowManager.LayoutParams params) {
+        params.gravity = flGravity.getGravity();
+        params.x = flGravity.getX();
+        params.y = flGravity.getY();
+    }
+
     private void setOnClickToView(View view) {
         if (view instanceof ViewGroup) {
             ViewGroup group = (ViewGroup) view;