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Commit 46d1b57

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author
fengjian
committed
add DividerItemDecoration as RecylerView default ItemDecoration
1 parent b148932 commit 46d1b57

3 files changed

Lines changed: 152 additions & 3 deletions

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‎app/src/main/java/com/jayfeng/lesscode/app/activity/adapterless/RecyclerAdapterActivity.java‎

Lines changed: 12 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,9 @@
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package com.jayfeng.lesscode.app.activity.adapterless;
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import android.app.Activity;
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import android.graphics.Color;
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import android.graphics.drawable.ColorDrawable;
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import android.graphics.drawable.GradientDrawable;
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import android.os.Bundle;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
@@ -9,7 +12,9 @@
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import com.jayfeng.lesscode.app.R;
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import com.jayfeng.lesscode.app.model.Person;
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import com.jayfeng.lesscode.core.AdapterLess;
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import com.jayfeng.lesscode.core.DisplayLess;
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import com.jayfeng.lesscode.core.ViewLess;
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import com.jayfeng.lesscode.core.other.DividerItemDecoration;
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import java.util.ArrayList;
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import java.util.List;
@@ -18,17 +23,20 @@ public class RecyclerAdapterActivity extends Activity {
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List<Person> list;
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RecyclerView recyclerView;
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private RecyclerView.LayoutManager layoutManager;
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RecyclerView.LayoutManager layoutManager;
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RecyclerView.Adapter<AdapterLess.RecyclerViewHolder> adapter;
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DividerItemDecoration dividerItemDecoration;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_adapter_recycler);
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recyclerView = ViewLess.$(this, R.id.recycler);
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layoutManager = new LinearLayoutManager(this);
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layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
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recyclerView.setLayoutManager(layoutManager);
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dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST, getResources().getDrawable(R.drawable.list_divider));
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dividerItemDecoration.setWidth(DisplayLess.$dp2px(16) + 1);
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initData();
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@@ -44,6 +52,8 @@ public void onBindViewHolder(int position, AdapterLess.RecyclerViewHolder recycl
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});
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recyclerView.setAdapter(adapter);
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recyclerView.addItemDecoration(dividerItemDecoration);
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}
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private void initData() {

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

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content">
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<TextView

‎lesscode-core/src/main/java/com/jayfeng/lesscode/core/other/DividerItemDecoration.java‎

Lines changed: 139 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,139 @@
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package com.jayfeng.lesscode.core.other;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.support.v4.view.ViewCompat;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import android.view.View;
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/**
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* RecyclerView的ItemDecoration的默认实现
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* 1. 默认使用系统的分割线
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* 2. 支持自定义Drawable类型
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* 3. 支持水平和垂直方向
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* 4. 修复了官方垂直Divider显示的bug
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* 扩展自官方android sdk下的Support7Demos下的DividerItemDecoration
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*/
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public class DividerItemDecoration extends RecyclerView.ItemDecoration {
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private static final int[] ATTRS = new int[]{
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android.R.attr.listDivider
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};
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public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
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public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
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private Drawable mDivider;
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private int mWidth;
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private int mHeight;
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private int mOrientation;
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public DividerItemDecoration(Context context, int orientation) {
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final TypedArray a = context.obtainStyledAttributes(ATTRS);
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mDivider = a.getDrawable(0);
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a.recycle();
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setOrientation(orientation);
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}
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/**
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* 新增：支持自定义dividerDrawable
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*
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* @param context
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* @param orientation
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* @param dividerDrawable
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*/
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public DividerItemDecoration(Context context, int orientation, Drawable dividerDrawable) {
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mDivider = dividerDrawable;
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setOrientation(orientation);
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}
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public void setOrientation(int orientation) {
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if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
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throw new IllegalArgumentException("invalid orientation");
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}
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mOrientation = orientation;
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}
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/**
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* 新增：支持手动为无高宽的drawable制定宽度
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* @param width
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*/
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public void setWidth(int width) {
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this.mWidth = width;
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}
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/**
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* 新增：支持手动为无高宽的drawable制定高度
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* @param height
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*/
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public void setHeight(int height) {
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this.mHeight = height;
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}
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@Override
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public void onDraw(Canvas c, RecyclerView parent) {
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if (mOrientation == VERTICAL_LIST) {
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drawVertical(c, parent);
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} else {
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drawHorizontal(c, parent);
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}
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}
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public void drawVertical(Canvas c, RecyclerView parent) {
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final int left = parent.getPaddingLeft();
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final int right = parent.getWidth() - parent.getPaddingRight();
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final int childCount = parent.getChildCount();
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for (int i = 0; i < childCount; i++) {
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final View child = parent.getChildAt(i);
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final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
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.getLayoutParams();
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final int top = child.getBottom() + params.bottomMargin +
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Math.round(ViewCompat.getTranslationY(child));
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final int bottom = top + getDividerHeight();
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mDivider.setBounds(left, top, right, bottom);
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mDivider.draw(c);
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}
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}
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public void drawHorizontal(Canvas c, RecyclerView parent) {
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final int top = parent.getPaddingTop();
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final int bottom = parent.getHeight() - parent.getPaddingBottom();
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final int childCount = parent.getChildCount();
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for (int i = 0; i < childCount; i++) {
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final View child = parent.getChildAt(i);
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final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
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.getLayoutParams();
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final int left = child.getRight() + params.rightMargin +
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Math.round(ViewCompat.getTranslationX(child));
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final int right = left + getDividerWidth();
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mDivider.setBounds(left, top, right, bottom);
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mDivider.draw(c);
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}
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}
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@Override
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public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
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if (mOrientation == VERTICAL_LIST) {
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outRect.set(0, 0, 0, getDividerHeight());
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} else {
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outRect.set(0, 0, getDividerWidth(), 0);
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}
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}
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private int getDividerWidth() {
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return mWidth > 0 ? mWidth : mDivider.getIntrinsicWidth();
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}
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private int getDividerHeight() {
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return mHeight > 0 ? mHeight : mDivider.getIntrinsicHeight();
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}
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}

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