wszdwp · July 11, 2018 18:11 · Dec 24, 2014 · Oct 31, 2014 · Oct 31, 2014
diff --git a/CursorRecyclerViewAdapter.java b/CursorRecyclerViewAdapter.java
@@ -1,19 +1,3 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
 /*
  * Copyright (C) 2014 [email protected]
  *

diff --git a/CursorRecyclerViewAdapter.java b/CursorRecyclerViewAdapter.java
@@ -1,3 +1,36 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Copyright (C) 2014 [email protected]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
 import android.content.Context;
 import android.database.Cursor;
 import android.database.DataSetObserver;

diff --git a/CursorRecyclerViewAdapter.java b/CursorRecyclerViewAdapter.java
@@ -0,0 +1,128 @@
+import android.content.Context;
+import android.database.Cursor;
+import android.database.DataSetObserver;
+import android.support.v7.widget.RecyclerView;
+
+/**
+ * Created by skyfishjy on 10/31/14.
+ */
+
+public abstract class CursorRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {
+
+    private Context mContext;
+
+    private Cursor mCursor;
+
+    private boolean mDataValid;
+
+    private int mRowIdColumn;
+
+    private DataSetObserver mDataSetObserver;
+
+    public CursorRecyclerViewAdapter(Context context, Cursor cursor) {
+        mContext = context;
+        mCursor = cursor;
+        mDataValid = cursor != null;
+        mRowIdColumn = mDataValid ? mCursor.getColumnIndex("_id") : -1;
+        mDataSetObserver = new NotifyingDataSetObserver();
+        if (mCursor != null) {
+            mCursor.registerDataSetObserver(mDataSetObserver);
+        }
+    }
+
+    public Cursor getCursor() {
+        return mCursor;
+    }
+
+    @Override
+    public int getItemCount() {
+        if (mDataValid && mCursor != null) {
+            return mCursor.getCount();
+        }
+        return 0;
+    }
+
+    @Override
+    public long getItemId(int position) {
+        if (mDataValid && mCursor != null && mCursor.moveToPosition(position)) {
+            return mCursor.getLong(mRowIdColumn);
+        }
+        return 0;
+    }
+
+    @Override
+    public void setHasStableIds(boolean hasStableIds) {
+        super.setHasStableIds(true);
+    }
+
+    public abstract void onBindViewHolder(VH viewHolder, Cursor cursor);
+
+    @Override
+    public void onBindViewHolder(VH viewHolder, int position) {
+        if (!mDataValid) {
+            throw new IllegalStateException("this should only be called when the cursor is valid");
+        }
+        if (!mCursor.moveToPosition(position)) {
+            throw new IllegalStateException("couldn't move cursor to position " + position);
+        }
+        onBindViewHolder(viewHolder, mCursor);
+    }
+
+    /**
+     * Change the underlying cursor to a new cursor. If there is an existing cursor it will be
+     * closed.
+     */
+    public void changeCursor(Cursor cursor) {
+        Cursor old = swapCursor(cursor);
+        if (old != null) {
+            old.close();
+        }
+    }
+
+    /**
+     * Swap in a new Cursor, returning the old Cursor.  Unlike
+     * {@link #changeCursor(Cursor)}, the returned old Cursor is <em>not</em>
+     * closed.
+     */
+    public Cursor swapCursor(Cursor newCursor) {
+        if (newCursor == mCursor) {
+            return null;
+        }
+        final Cursor oldCursor = mCursor;
+        if (oldCursor != null && mDataSetObserver != null) {
+            oldCursor.unregisterDataSetObserver(mDataSetObserver);
+        }
+        mCursor = newCursor;
+        if (mCursor != null) {
+            if (mDataSetObserver != null) {
+                mCursor.registerDataSetObserver(mDataSetObserver);
+            }
+            mRowIdColumn = newCursor.getColumnIndexOrThrow("_id");
+            mDataValid = true;
+            notifyDataSetChanged();
+        } else {
+            mRowIdColumn = -1;
+            mDataValid = false;
+            notifyDataSetChanged();
+            //There is no notifyDataSetInvalidated() method in RecyclerView.Adapter
+        }
+        return oldCursor;
+    }
+
+    private class NotifyingDataSetObserver extends DataSetObserver {
+        @Override
+        public void onChanged() {
+            super.onChanged();
+            mDataValid = true;
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public void onInvalidated() {
+            super.onInvalidated();
+            mDataValid = false;
+            notifyDataSetChanged();
+            //There is no notifyDataSetInvalidated() method in RecyclerView.Adapter
+        }
+    }
+}
diff --git a/MyListCursorAdapter.java b/MyListCursorAdapter.java
@@ -0,0 +1,41 @@
+import android.content.Context;
+import android.database.Cursor;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+import java.util.List;
+
+/**
+ * Created by skyfishjy on 10/31/14.
+ */
+public class MyListCursorAdapter extends CursorRecyclerViewAdapter<MyListCursorAdapter.ViewHolder>{
+
+    public MyListCursorAdapter(Context context,Cursor cursor){
+       super(context,cursor);
+    }
+
+    public static class ViewHolder extends RecyclerView.ViewHolder {
+        public TextView mTextView;
+        public ViewHolder(View view) {
+            super(view);
+            mTextView = view.findViewById(R.id.text);
+        }
+    }
+
+    @Override
+    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View itemView = LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.my_view, parent, false);
+        ViewHolder vh = new ViewHolder(itemView);
+        return vh;
+    }
+
+    @Override
+    public void onBindViewHolder(ViewHolder viewHolder, Cursor cursor) {
+        MyListItem myListItem = MyListItem.fromCursor(cursor);
+        viewHolder.mTextView.setText(myListItem.getName());
+    }
+}
diff --git a/MyListItem.java b/MyListItem.java
@@ -0,0 +1,14 @@
+public class MyListItem{
+  private String name;
+
+  public void setName(String name){
+    this.name=name;
+  }
+  public String getName(){
+    return name;
+  }
+
+  public static MyListItem fromCursor(Cursor cursor) {
+    //TODO return your MyListItem from cursor.
+  }
+}