Add Grid auto-column example

moonlsd · Nov 19, 2015 · 57eea45f0b39676ba40d1a06e1e5d8c15c372983 · 57eea45 · engr-erum · Sep 28, 2017
1 parent e1da326
commit 57eea45f0b39676ba40d1a06e1e5d8c15c372983
Unified Split

Showing with 57 additions and 3 deletions.

+2 −2 app/build.gradle

+55 −1 app/src/main/java/com/codentrick/recyclerviewcollection/ui/GridActivity.java
diff --git a/app/build.gradle b/app/build.gradle
@@ -21,6 +21,6 @@ android {
 dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
-  
-    compile 'com.android.support:design:23.0.1'
-  
-    compile 'com.android.support:recyclerview-v7:23.0.1'
+  
+    compile 'com.android.support:design:23.1.1'
+  
+    compile 'com.android.support:recyclerview-v7:23.1.1'
 }
diff --git a/app/src/main/java/com/codentrick/recyclerviewcollection/ui/GridActivity.java b/app/src/main/java/com/codentrick/recyclerviewcollection/ui/GridActivity.java
@@ -1,8 +1,10 @@
 package com.codentrick.recyclerviewcollection.ui;
+  
+import android.content.Context;
 import android.os.Bundle;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
+  
+import android.util.TypedValue;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
@@ -21,8 +23,9 @@
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple);
+  
+        GridAutofitLayoutManager layoutManager = new GridAutofitLayoutManager(this, 160);
        RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
-  
-        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
+  
+        mRecyclerView.setLayoutManager(layoutManager);
        mRecyclerView.setAdapter(new SimpleAdapter());
    }
@@ -54,4 +57,55 @@ public void onBindViewHolder(SimpleHolder simpleHolder, int i) {
            simpleHolder.mTextView.setText(DataProvider.JAVA_BOOKS[i]);
        }
    }
+  
+
+  
+    public static class GridAutofitLayoutManager extends GridLayoutManager {
+  
+
+  
+        private int mColumnWidth;
+  
+        private boolean mColumnWidthChanged = true;
+  
+
+  
+        public GridAutofitLayoutManager(Context context, int columnWidth) {
+  
+            super(context, 1);
+  
+            setColumnWidth(checkedColumnWidth(context, columnWidth));
+  
+        }
+  
+
+  
+        public GridAutofitLayoutManager(Context context, int columnWidth, int orientation, boolean reverseLayout) {
+  
+        /* Initially set spanCount to 1, will be changed automatically later. */
+  
+            super(context, 1, orientation, reverseLayout);
+  
+            setColumnWidth(checkedColumnWidth(context, columnWidth));
+  
+        }
+  
+
+  
+        private int checkedColumnWidth(Context context, int columnWidth) {
+  
+            if (columnWidth <= 0) {
+  
+            /* Set default columnWidth value (48dp here). It is better to move this constant
+  
+            to static constant on top, but we need context to convert it to dp, so can't really
+  
+            do so. */
+  
+                columnWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 48,
+  
+                        context.getResources().getDisplayMetrics());
+  
+            }
+  
+            return columnWidth;
+  
+        }
+  
+
+  
+        public void setColumnWidth(int newColumnWidth) {
+  
+            if (newColumnWidth > 0 && newColumnWidth != mColumnWidth) {
+  
+                mColumnWidth = newColumnWidth;
+  
+                mColumnWidthChanged = true;
+  
+            }
+  
+        }
+  
+
+  
+        @Override
+  
+        public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
+  
+            if (mColumnWidthChanged && mColumnWidth > 0) {
+  
+                int totalSpace;
+  
+                if (getOrientation() == VERTICAL) {
+  
+                    totalSpace = getWidth() - getPaddingRight() - getPaddingLeft();
+  
+                } else {
+  
+                    totalSpace = getHeight() - getPaddingTop() - getPaddingBottom();
+  
+                }
+  
+                int spanCount = Math.max(1, totalSpace / mColumnWidth);
+  
+                setSpanCount(spanCount);
+  
+                mColumnWidthChanged = false;
+  
+            }
+  
+            super.onLayoutChildren(recycler, state);
+  
+        }
+  
+    }
 }