首先上实例:
项目工程文件：
界面布局：
activity_tab.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/fastlane_background"
android:orientation="vertical"
tools:context=".activity.TabActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_tan"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:descendantFocusability="afterDescendants"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintLeft_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4"
android:orientation="horizontal">
<ImageView
android:id="@+id/main_img"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2"
android:background="@drawable/bg_recyclerview_item"
android:focusable="true"
android:focusableInTouchMode="true"
android:padding="15dp"
android:src="@drawable/pro2"
/>
<!-- <androidx.recyclerview.widget.RecyclerView
android:id="@+id/main_tab_rv"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2"/>-->
<com.example.focusdome.view.FocusRecyclerView
android:id="@+id/main_tab_rv"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/button_tab_rv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
</LinearLayout>
layout_found_h_recycler_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:focusable="true"
android:background="@drawable/bg_recyclerview_item"
android:padding="20dp"
>
<com.example.focusdome.view.CircleImageView
android:id="@+id/f_h_c_img"
android:layout_width="109dp"
android:layout_height="0dp"
android:layout_gravity="center"
android:layout_weight="3"
android:src="@drawable/pro5"
/>
<TextView
android:id="@+id/f_h_c_txt"
android:layout_width="120dp"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:text="1111"
android:textSize="10dp"
/>
</LinearLayout>
layout_main_recycler_txtrecycler.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="true"
android:background="@drawable/bg_recyclerview_item"
>
<TextView
android:id="@+id/main_rv_rv_txt"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center"
/>
</LinearLayout>
layout_recycler_text_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="horizontal"
android:gravity="center"
android:background="@drawable/bg_recyclerview_item"
android:focusable="true">
<TextView
android:id="@+id/tv"
android:layout_width="120dp"
android:layout_height="60dp"
android:textColor="#ffffff"
android:textSize="16sp"
android:text=""
android:padding="10dp"
android:gravity="center"
/>
</LinearLayout>
资源文件：
bg_recyclerview_item.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/bg_recyclerview_focus" android:state_selected="true" />
<item android:drawable="@drawable/bg_recyclerview_focus" android:state_focused="true" />
<item android:drawable="@drawable/bg_recyclerview_focus" android:state_pressed="true" />
<item android:drawable="@color/transparent"/>
</selector>
bg_recyclerview_focus.xml:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#80B469FF" />
<corners android:radius="10dp" />
</shape>
</item>
<item android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp">
<shape android:shape="rectangle">
<solid android:color="#60B469FF" />
<corners android:radius="8dp" />
</shape>
</item>
<item
android:bottom="5dp"
android:left="5dp"
android:right="5dp"
android:top="5dp">
<shape
android:layout_width="wrap_content"
android:shape="rectangle">
<stroke
android:width="1dp"
android:color="#6672f8" />
</shape>
</item>
<item
android:bottom="6dp"
android:left="6dp"
android:right="6dp"
android:top="6dp">
<shape android:shape="rectangle">
<stroke
android:width="1dp"
android:color="#6672f8" />
</shape>
</item>
<item
android:bottom="7dp"
android:left="7dp"
android:right="7dp"
android:top="7dp">
<color android:color="@color/color_141843"/>
</item>
</layer-list>
activity代码：
package com.example.focusdome.activity;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.ViewCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.focusdome.R;
import com.example.focusdome.adapter.BtnRecyclerViewAdapter;
import com.example.focusdome.adapter.MainRecyclerViewAdapter;
import com.example.focusdome.adapter.MyRecyclerViewAdapter;
import com.example.focusdome.model.RecyclerMainModel;
import com.example.focusdome.view.FocusLinearLayoutManager;
import com.example.focusdome.view.SpaceDecoration;
import java.util.ArrayList;
public class TabActivity extends Activity implements MyRecyclerViewAdapter.OnItemClickListener,MyRecyclerViewAdapter.OnItemFocusChangeListener{
private MyRecyclerViewAdapter adapter;
private RecyclerView recyclerView;
private String[] titles = {"首页", "游戏","教育","生活","娱乐","新闻","直播","我的"};
private ImageView imageView;
//主体部分
private MainRecyclerViewAdapter mAdapter;
private RecyclerView mainRecyclerView;
private ArrayList<RecyclerMainModel> list = new ArrayList<>();
//底部部分
private BtnRecyclerViewAdapter btnRecyclerViewAdapter;
private RecyclerView btnRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab);
initView();
initAdapter();
//初始化主体部分recycle
mainRecyclerView = findViewById(R.id.main_tab_rv);
list.add(new RecyclerMainModel("第一张",R.drawable.pre));
list.add(new RecyclerMainModel("第二张",R.drawable.pro));
list.add(new RecyclerMainModel("第三张",R.drawable.pro2));
list.add(new RecyclerMainModel("第四张",R.drawable.pro3));
list.add(new RecyclerMainModel("第五张",R.drawable.pro4));
list.add(new RecyclerMainModel("第六张",R.drawable.hp_one));
list.add(new RecyclerMainModel("第七张",R.drawable.hp_four));
list.add(new RecyclerMainModel("第八张",R.drawable.hp_five));
mAdapter = new MainRecyclerViewAdapter(this, list, new MainRecyclerViewAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Log.v("点击:", "" + position + view.getId());
imageView.setImageResource(list.get(position).getM_imgId());
//imageView.setScaleType(ImageView.ScaleType.CENTER);
}
}/*, new MainRecyclerViewAdapter.OnItemFocusChangeListener() {
@Override
public void onItemFocusChange(View view, int position, boolean hasFocus) {
// Toast.makeText(TabActivity.this,"focus"+position,Toast.LENGTH_LONG).show();
imageView.setImageResource(list.get(position).getM_imgId());
}
}*/) {
//获得焦点时处理
@Override
protected void onItemFocus(View itemView,int positon) {
imageView.setImageResource(list.get(positon).getM_imgId());
System.out.println("获取焦点成功！"+positon);
Log.i("view:",itemView.getId()+"23333");
itemView.setSelected(true);
View view = itemView.findViewById(R.id.main_rv_rv_txt);
view.setSelected(true);
}
//失去焦点时
@Override
protected void onItemGetNormal(View itemView) {
System.out.println("失去焦点成功！");
Log.i("view:",itemView.getId()+"32222");
itemView.setSelected(false);
View view = itemView.findViewById(R.id.main_rv_rv_txt);
view.setSelected(true);
}
};
FocusLinearLayoutManager linearLayoutManager = new FocusLinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
mainRecyclerView.setLayoutManager(linearLayoutManager);
mainRecyclerView.addItemDecoration(new SpaceDecoration(30));
mainRecyclerView.setAdapter(mAdapter);
//初始化底部部分
btnRecyclerView = (RecyclerView)findViewById(R.id.button_tab_rv);
btnRecyclerViewAdapter = new BtnRecyclerViewAdapter(this, list) {
@Override
protected void onItemFocus(View itemView, int position) {
itemView.setSelected(true);
//View view = itemView.
}
@Override
protected void onItemGetNormal(View itemView) {
itemView.setSelected(false);
}
};
FocusLinearLayoutManager linearLayoutManager1 = new FocusLinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
btnRecyclerView.setLayoutManager(linearLayoutManager1);
btnRecyclerView.setAdapter(btnRecyclerViewAdapter);
}
private void initView() {
recyclerView = findViewById(R.id.rv_tan);
imageView= findViewById(R.id.main_img);
imageView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View view, boolean b) {
Log.v("img_focus",""+view.getId());
}
});
}
private void initAdapter() {
adapter = new MyRecyclerViewAdapter(this, titles);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(adapter);
recyclerView.requestFocus();
adapter.setmOnItemClickListener(this);
adapter.setmOnItemClickListener(this);
}
@Override
public void onItemClick(View view, int position) {
Log.i("Activity:onItemClick","mOnItemFocusChangeListener.onItemFocusChange(v, position, hasFocus);");
}
@Override
public void onItemFocusChange(View view, int position, boolean hasFocus) {
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
return super.onKeyDown(keyCode, event);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
//View v = getCurrentFocus();
return super.dispatchKeyEvent(event);
}
}
adapter代码：
其余的adapter基本和这个差不多
package com.example.focusdome.adapter;
import android.content.Context;
import android.os.Build;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.view.ViewCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.focusdome.R;
import com.example.focusdome.activity.TabActivity;
import com.example.focusdome.model.RecyclerMainModel;
import java.util.ArrayList;
public abstract class BtnRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private ArrayList<RecyclerMainModel> data;
private MyRecyclerViewAdapter.OnItemFocusChangeListener mOnItemFocusChangeListener;
private MyRecyclerViewAdapter.OnItemClickListener mOnItemClickListener;
private final LayoutInflater layoutInflater;
private int defaultFocus = 0;
private boolean needFocus = true;
public BtnRecyclerViewAdapter(Context context, ArrayList<RecyclerMainModel> list) {
this.context = context;
this.data = list;
layoutInflater = LayoutInflater.from(context);
}
public interface OnItemClickListener{
void onItemClick(View view, int position);
}
public interface OnItemFocusChangeListener{
void onItemFocusChange(View view, int position, boolean hasFocus);
}
public final void setmOnItemClickListener(@Nullable MyRecyclerViewAdapter.OnItemClickListener listener){
mOnItemClickListener = listener;
}
private void setmOnItemFocusChangeListener(@Nullable MyRecyclerViewAdapter.OnItemFocusChangeListener focusChangeListener){
this.mOnItemFocusChangeListener = focusChangeListener;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = layoutInflater.inflate(R.layout.layout_found_h_recycler_item,parent,false);
return new RecyclerViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder,final int position) {
RecyclerViewHolder viewHolder = (RecyclerViewHolder)holder;
viewHolder.imageView.setImageResource(data.get(position).getM_imgId());
viewHolder.textView.setText(data.get(position).getM_txt());
if (mOnItemClickListener != null) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mOnItemClickListener.onItemClick(v, position);
Log.e("click事件：","你点击了"+v.getId());
}
});
}
holder.itemView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus){
focusStatus(v,position);
}else {
normalStatus(v);
}
Log.i("adapter:","onFocusChange");
}
});
if (needFocus) {
Log.i("进行移动:","：");
if (defaultFocus < 0) {
defaultFocus = 0;
}
if (defaultFocus >= getItemCount()) {
defaultFocus = getItemCount() - 1;
}
if (defaultFocus == position) {
if (!holder.itemView.isFocusable()) {
defaultFocus++;
} else {
holder.itemView.requestFocus();
}
}
} else {
//setNeedFocus(position == (getItemCount() - 1));
}
}
@Override
public int getItemCount() {
return data.size();
}
private class RecyclerViewHolder extends RecyclerView.ViewHolder {
public TextView textView;
public ImageView imageView;
public RecyclerViewHolder(@NonNull View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.f_h_c_txt);
imageView = (ImageView)itemView.findViewById(R.id.f_h_c_img);
}
}
/**
* item获得焦点时调用
*
* @param itemView view
*/
private void focusStatus(View itemView,int position) {
if (itemView == null) {
return;
}
float scalX,scalY;
scalX = 1.1f;
scalY = 1.1f;
if (Build.VERSION.SDK_INT >= 21) {
//抬高Z轴
ViewCompat.animate(itemView).scaleX(scalX).scaleY(scalY).translationZ(1.3f).start();
} else {
ViewCompat.animate(itemView).scaleX(scalX).scaleY(scalY).start();
ViewGroup parent = (ViewGroup) itemView.getParent();
parent.requestLayout();
parent.invalidate();
}
onItemFocus(itemView,position);
}
/**
* 当item获得焦点时处理
*
* @param itemView itemView
*/
protected abstract void onItemFocus(View itemView,int position);
/**
* item失去焦点时
*
* @param itemView item对应的View
*/
private void normalStatus(View itemView) {
if (itemView == null) {
return;
}
if (Build.VERSION.SDK_INT >= 21) {
ViewCompat.animate(itemView).scaleX(1.0f).scaleY(1.0f).translationZ(0).start();
} else {
ViewCompat.animate(itemView).scaleX(1.0f).scaleY(1.0f).start();
ViewGroup parent = (ViewGroup) itemView.getParent();
parent.requestLayout();
parent.invalidate();
}
onItemGetNormal(itemView);
}
/**
* 当条目失去焦点时调用
*
* @param itemView 条目对应的View
*/
protected abstract void onItemGetNormal(View itemView);
}
model代码：
package com.example.focusdome.model;
public class RecyclerMainModel {
private String m_txt;
private int m_imgId;
public RecyclerMainModel(String m_txt, int m_imgId) {
this.m_txt = m_txt;
this.m_imgId = m_imgId;
}
public String getM_txt() {
return m_txt;
}
public void setM_txt(String m_txt) {
this.m_txt = m_txt;
}
public int getM_imgId() {
return m_imgId;
}
public void setM_imgId(int m_imgId) {
this.m_imgId = m_imgId;
}
}
view代码：
CircleImageView.java:
自定义圆形ImageView
package com.example.focusdome.view;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
@SuppressLint("AppCompatCustomView")
public class CircleImageView extends ImageView { //画笔
private Paint mPaint;
//圆形图片的半径
private int mRadius;
//图片的宿放比例
private float mScale;
public CircleImageView(Context context) {
super(context);
}
public CircleImageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public CircleImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//由于是圆形，宽高应保持一致
int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
mRadius = size / 2;
setMeasuredDimension(size, size);
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
Drawable drawable = getDrawable();
if (null != drawable) {
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
//初始化BitmapShader，传入bitmap对象
BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
//计算缩放比例
mScale = (mRadius * 2.0f) / Math.min(bitmap.getHeight(), bitmap.getWidth());
Matrix matrix = new Matrix();
matrix.setScale(mScale, mScale);
bitmapShader.setLocalMatrix(matrix);
mPaint.setShader(bitmapShader);
//画圆形，指定好坐标，半径，画笔
canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
} else {
super.onDraw(canvas);
}
}
}
自定义RecyclerView，重写dispatchKeyEvent()方法,进行焦点控制：
FocusRecyclerView：
package com.example.focusdome.view;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.FocusFinder;
import android.view.KeyEvent;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.RecyclerView;
public class FocusRecyclerView extends RecyclerView {
public FocusRecyclerView(@NonNull Context context) {
super(context);
}
public FocusRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public FocusRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
int keyCode = event.getKeyCode();
//水平垂直的时候:按下左键或者右键
if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT || keyCode == KeyEvent.KEYCODE_DPAD_RIGHT /*|| keyCode == KeyEvent.KEYCODE_DPAD_DOWN || keyCode == KeyEvent.KEYCODE_DPAD_UP*/) {
//获取当前焦点的视图
View focusedView = getFocusedChild();
View nextFocusView;
try {
/* switch (keyCode){
case KeyEvent.KEYCODE_DPAD_LEFT:
Log.v("left","往左");
//通过findNextFocus获取下一个需要的焦点的vie
nextFocusView = FocusFinder.getInstance().findNextFocus(this,focusedView,View.FOCUS_LEFT);
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
Log.v("right","往右");
nextFocusView = FocusFinder.getInstance().findNextFocus(this,focusedView,View.FOCUS_RIGHT);
break;
case KeyEvent.KEYCODE_DPAD_UP:
Log.v("up","往上");
nextFocusView = FocusFinder.getInstance().findNextFocus(this,focusedView,View.FOCUS_UP);
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
nextFocusView = FocusFinder.getInstance().findNextFocus(this,focusedView,View.FOCUS_DOWN);
Log.v("down","往下");
break;
default:
nextFocusView = null;
break;
}*/
if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
Log.v("left", "焦点往左跑");
//通过findNextFocus获取下一个需要得到的焦点的view
nextFocusView = FocusFinder.getInstance().findNextFocus(this, focusedView, View.FOCUS_LEFT);
if(nextFocusView == null){
Log.v("同级","View查找");
// nextFocusView = FocusFinder.getInstance().findNextFocus(this,focusedView.getRootView().,View.FOCUS_LEFT);
nextFocusView = focusedView.getParent().focusSearch(focusedView,View.FOCUS_LEFT);
}
} else {
Log.v("right", "右边跑");
//通过findNextFocus获取下一个需要得到的焦点的View
nextFocusView = FocusFinder.getInstance().findNextFocus(this, focusedView, View.FOCUS_RIGHT);
}
} catch (Exception e) {
nextFocusView = null;
}
//如果获取失败，消耗掉事件，不让系统处理，并让原先的view获取焦点
if (nextFocusView == null) {
focusedView.requestFocus();
return true;
}
}
}
return super.dispatchKeyEvent(event);
}
@Override
public View focusSearch(int direction) {
return super.focusSearch(direction);
}
}
SpaceDecoration.java
package com.example.focusdome.view;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.view.View;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.OrientationHelper;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;
import com.chad.library.adapter.base.BaseQuickAdapter;
import static android.widget.LinearLayout.VERTICAL;
public class SpaceDecoration extends RecyclerView.ItemDecoration {
private int space;
private int headerCount = -1;
private int footerCount = Integer.MAX_VALUE;
private boolean mPaddingEdgeSide = true;
private boolean mPaddingStart = true;
private boolean mPaddingHeaderFooter = false;
private ColorDrawable mColorDrawable;
private boolean mDrawLastItem = true;
private boolean mDrawHeaderFooter = false;
public SpaceDecoration(int space) {
this.mColorDrawable = new ColorDrawable(Color.parseColor("#e7e7e7"));
this.space = space;
}
public SpaceDecoration(int space, int color) {
this.mColorDrawable = new ColorDrawable(color);
this.space = space;
}
public void setPaddingEdgeSide(boolean mPaddingEdgeSide) {
this.mPaddingEdgeSide = mPaddingEdgeSide;
}
public void setPaddingStart(boolean mPaddingStart) {
this.mPaddingStart = mPaddingStart;
}
public void setPaddingHeaderFooter(boolean mPaddingHeaderFooter) {
this.mPaddingHeaderFooter = mPaddingHeaderFooter;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view);
int spanCount = 0;
int orientation = 0;
int spanIndex = 0;
int headerCount = 0, footerCount = 0;
if (parent.getAdapter() instanceof BaseQuickAdapter) {
headerCount = ((BaseQuickAdapter) parent.getAdapter()).getHeaderLayoutCount();
footerCount = ((BaseQuickAdapter) parent.getAdapter()).getFooterLayoutCount();
}
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof StaggeredGridLayoutManager) {
orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();
spanCount = ((StaggeredGridLayoutManager) layoutManager).getSpanCount();
spanIndex = ((StaggeredGridLayoutManager.LayoutParams) view.getLayoutParams()).getSpanIndex();
} else if (layoutManager instanceof GridLayoutManager) {
orientation = ((GridLayoutManager) layoutManager).getOrientation();
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
spanIndex = ((GridLayoutManager.LayoutParams) view.getLayoutParams()).getSpanIndex();
} else if (layoutManager instanceof LinearLayoutManager) {
orientation = ((LinearLayoutManager) layoutManager).getOrientation();
spanCount = 1;
spanIndex = 0;
}
/**
* 普通Item的尺寸
*/
if ((position >= headerCount && position < parent.getAdapter().getItemCount() - footerCount)) {
if (orientation == VERTICAL) {
float expectedWidth = (float) (parent.getWidth() - space * (spanCount + (mPaddingEdgeSide ? 1 : -1))) / spanCount;
float originWidth = (float) parent.getWidth() / spanCount;
float expectedX = (mPaddingEdgeSide ? space : 0) + (expectedWidth + space) * spanIndex;
float originX = originWidth * spanIndex;
outRect.left = (int) (expectedX - originX);
outRect.right = (int) (originWidth - outRect.left - expectedWidth);
if (position - headerCount < spanCount && mPaddingStart) {
outRect.top = space;
}
outRect.bottom = space;
return;
} else {
float expectedHeight = (float) (parent.getHeight() - space * (spanCount + (mPaddingEdgeSide ? 1 : -1))) / spanCount;
float originHeight = (float) parent.getHeight() / spanCount;
float expectedY = (mPaddingEdgeSide ? space : 0) + (expectedHeight + space) * spanIndex;
float originY = originHeight * spanIndex;
outRect.bottom = (int) (expectedY - originY);
outRect.top = (int) (originHeight - outRect.bottom - expectedHeight);
if (position - headerCount < spanCount && mPaddingStart) {
outRect.left = space;
}
outRect.right = space;
return;
}
} else if (mPaddingHeaderFooter) {
if (orientation == VERTICAL) {
outRect.right = outRect.left = mPaddingEdgeSide ? space : 0;
outRect.top = mPaddingStart ? space : 0;
} else {
outRect.top = outRect.bottom = mPaddingEdgeSide ? space : 0;
outRect.left = mPaddingStart ? space : 0;
}
}
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
if (parent.getAdapter() == null) {
return;
}
int orientation = 0;
int headerCount = 0, footerCount = 0, dataCount;
if (parent.getAdapter() instanceof BaseQuickAdapter) {
headerCount = ((BaseQuickAdapter) parent.getAdapter()).getHeaderLayoutCount();
footerCount = ((BaseQuickAdapter) parent.getAdapter()).getFooterLayoutCount();
dataCount = parent.getAdapter().getItemCount();
} else {
dataCount = parent.getAdapter().getItemCount();
}
int dataStartPosition = headerCount;
int dataEndPosition = headerCount + dataCount;
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof StaggeredGridLayoutManager) {
orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();
} else if (layoutManager instanceof GridLayoutManager) {
orientation = ((GridLayoutManager) layoutManager).getOrientation();
} else if (layoutManager instanceof LinearLayoutManager) {
orientation = ((LinearLayoutManager) layoutManager).getOrientation();
}
int start, end;
if (orientation == OrientationHelper.VERTICAL) {
start = parent.getPaddingLeft();
end = parent.getWidth() - parent.getPaddingRight();
} else {
start = parent.getPaddingTop();
end = parent.getHeight() - parent.getPaddingBottom();
}
int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
View child = parent.getChildAt(i);
int position = parent.getChildAdapterPosition(child);
if (position >= dataStartPosition && position < dataEndPosition - 1//数据项除了最后一项
|| (position == dataEndPosition - 1 && mDrawLastItem)//数据项最后一项
|| (!(position >= dataStartPosition && position < dataEndPosition) && mDrawHeaderFooter)//header&footer且可绘制
) {
if (orientation == OrientationHelper.VERTICAL) {
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int top = child.getBottom() + params.bottomMargin;
int bottom = top;
mColorDrawable.setBounds(start, top, end, bottom);
mColorDrawable.draw(c);
} else {
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int left = child.getRight() + params.rightMargin;
int right = left;
mColorDrawable.setBounds(left, start, right, end);
mColorDrawable.draw(c);
}
}
}
}
}
防止按键速度过快RecyclerView焦点乱飞问题：
FocusLinearLayoutManager.java
package com.example.focusdome.view;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.LinearLayoutManager;
public class FocusLinearLayoutManager extends LinearLayoutManager {
public FocusLinearLayoutManager(Context context) {
super(context);
}
public FocusLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
public FocusLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Nullable
@Override
public View onInterceptFocusSearch(@NonNull View focused, int direction) {
Log.v("manger","ssssss");
int currentPosition = getPosition(getFocusedChild());
int count = getItemCount();
int lastVisiblePosition = findLastVisibleItemPosition();
switch (direction){
case View.FOCUS_RIGHT:
currentPosition++;
break;
case View.FOCUS_LEFT:
currentPosition++;
break;
case View.FOCUS_DOWN:
currentPosition++;
break;
case View.FOCUS_UP:
currentPosition++;
break;
}
if (currentPosition<0||currentPosition>count){
return focused;
}else {
if (currentPosition>lastVisiblePosition){
scrollToPosition(currentPosition);
}
}
return super.onInterceptFocusSearch(focused, direction);
}
}
项目地址：https://download.csdn.net/download/qq_41861266/12691503