QQ5.0列表滑动删除的简单实现

自定义一个view 继承LinearLayout:

代码:

public class SwipeLayout extends LinearLayout {

private ViewDragHelper viewDragHelper;
private View contentView;
private View actionView;
private int dragDistance;
private final double AUTO_OPEN_SPEED_LIMIT = 800.0;
private int draggedX;

public SwipeLayout(Context context) {
this(context, null);
}

public SwipeLayout(Context context, AttributeSet attrs) {
this(context, attrs, -1);
}

public SwipeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
viewDragHelper = ViewDragHelper.create(this, new DragHelperCallback());
}

@Override
protected void onFinishInflate() {
contentView = getChildAt(0);
actionView = getChildAt(1);
actionView.setVisibility(GONE);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);

dragDistance = actionView.getMeasuredWidth();
}

private class DragHelperCallback extends ViewDragHelper.Callback {

@Override
public boolean tryCaptureView(View view, int i) {
return view == contentView || view == actionView;
}

@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
draggedX = left;
if (changedView == contentView) {
actionView.offsetLeftAndRight(dx);
} else {
contentView.offsetLeftAndRight(dx);
}
if (actionView.getVisibility() == View.GONE) {
actionView.setVisibility(View.VISIBLE);
}
invalidate();
}

@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
if (child == contentView) {
final int leftBound = getPaddingLeft();
final int minLeftBound = -leftBound - dragDistance;
final int newLeft = Math.min(Math.max(minLeftBound, left), 0);
return newLeft;
} else {
final int minLeftBound = getPaddingLeft() + contentView.getMeasuredWidth() - dragDistance;
final int maxLeftBound = getPaddingLeft() + contentView.getMeasuredWidth() + getPaddingRight();
final int newLeft = Math.min(Math.max(left, minLeftBound), maxLeftBound);
return newLeft;
}
}

@Override
public int getViewHorizontalDragRange(View child) {
return dragDistance;
}

@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
super.onViewReleased(releasedChild, xvel, yvel);
boolean settleToOpen = false;
if (xvel > AUTO_OPEN_SPEED_LIMIT) {
settleToOpen = false;
} else if (xvel < -AUTO_OPEN_SPEED_LIMIT) {
settleToOpen = true;
} else if (draggedX <= -dragDistance / 2) {
settleToOpen = true;
} else if (draggedX > -dragDistance / 2) {
settleToOpen = false;
}

final int settleDestX = settleToOpen ? -dragDistance : 0;
viewDragHelper.smoothSlideViewTo(contentView, settleDestX, 0);
ViewCompat.postInvalidateOnAnimation(SwipeLayout.this);
}
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if(viewDragHelper.shouldInterceptTouchEvent(ev)) {
return true;
}
return super.onInterceptTouchEvent(ev);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
viewDragHelper.processTouchEvent(event);
return true;
}

@Override
public void computeScroll() {
super.computeScroll();
if(viewDragHelper.continueSettling(true)) {
ViewCompat.postInvalidateOnAnimation(this);
}
}
}

2:Mainactivity代码:

public class MainActivity extends AppCompatActivity {

private RecyclerView rlv;
private ArrayList<String> list;
private RecyclerView.LayoutManager LayoutManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
initAdapter();

}

/**
* 控件
*/
private void initView() {
rlv = (RecyclerView) findViewById(R.id.rlv);
}

/**
* 数据
*/
private void initData() {
list = new ArrayList<>();
for (int i = 0; i < 50; i++) {
list.add("5.0新特性测试" + i);
}
}

/**
* 适配器
*/
private void initAdapter() {
ItemAdapter ItemAdapter = new ItemAdapter(this, list);
LayoutManager = new GridLayoutManager(this, 1);
rlv.setLayoutManager(LayoutManager);
rlv.setAdapter(ItemAdapter);
}

}
3:主布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<android.support.v7.widget.RecyclerView
android:id="@+id/rlv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

4:Item布局:

<com.lhz.swipelayoutexample.SwipeLayout
xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_height="200dp" android:layout_width="match_parent" > <LinearLayout android:background="#ffffff" android:layout_height="50dp" android:layout_width="match_parent"> <TextView android:id="@+id/item_tv" android:layout_gravity="center_vertical" android:layout_height="wrap_content" android:layout_width="wrap_content" android:paddingLeft="20dp" android:text="@string/hello_world" android:textSize="20sp" /> </LinearLayout> <LinearLayout android:layout_height="50dp" android:layout_width="150dp"> <RelativeLayout android:background="#ff0000" android:clickable="true" android:id="@+id/delete_button" android:layout_height="50dp" android:layout_width="50dp"> <View android:background="@drawable/trash" android:layout_centerInParent="true" android:layout_height="28dp" android:layout_width="28dp" /> </RelativeLayout> <RelativeLayout android:background="#c2c2c2" android:clickable="true" android:id="@+id/view_button" android:layout_height="50dp" android:layout_width="50dp"> <View android:background="@drawable/magnifier" android:layout_centerInParent="true" android:layout_height="28dp" android:layout_width="28dp" /> </RelativeLayout> <RelativeLayout android:background="#aaffff" android:clickable="true" android:id="@+id/star_button" android:layout_height="50dp" android:layout_width="50dp"> <View android:background="@drawable/star" android:layout_centerInParent="true" android:layout_height="28dp" android:layout_width="28dp" /> </RelativeLayout> </LinearLayout></com.lhz.swipelayoutexample.SwipeLayout>5:适配器:

package com.github.lzyzsd.swipelayoutexample;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.github.lzyzsd.viewdraghelperdemo.R;

import java.util.ArrayList;

/**
*lhz
* 2016.4.21
*/
public class ItemAdapter extends RecyclerView.Adapter implements View.OnClickListener {
private ArrayList<String> list;
private Context Context;

public ItemAdapter(Context Context, ArrayList<String> list) {
this.Context = Context;
this.list = list;

}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View inflate = View.inflate(Context, R.layout.item_list, null);
Demo Demo = new Demo(inflate);
return Demo;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
Demo Demo = (ItemAdapter.Demo) holder;
Demo.item_tv.setText(list.get(position));
Demo.delete_button.setOnClickListener(this);
Demo.view_button.setOnClickListener(this);
Demo.star_button.setOnClickListener(this);
}

@Override
public int getItemCount() {
return list.size();
}

/**
* 后面逻辑自己处理
* @param v
*/
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.delete_button:
Toast.makeText(Context, "delete_button", Toast.LENGTH_SHORT).show();

break;
case R.id.view_button:
Toast.makeText(Context, "view_button", Toast.LENGTH_SHORT).show();

break;
case R.id.star_button:
Toast.makeText(Context, "star_button", Toast.LENGTH_SHORT).show();

break;
}
}

private class Demo extends RecyclerView.ViewHolder {

private final RelativeLayout star_button;
private final RelativeLayout view_button;
private final RelativeLayout delete_button;
private final TextView item_tv;

public Demo(View itemView) {
super(itemView);
delete_button = (RelativeLayout) itemView.findViewById(R.id.delete_button);
view_button = (RelativeLayout) itemView.findViewById(R.id.view_button);
star_button = (RelativeLayout) itemView.findViewById(R.id.star_button);
item_tv = (TextView) itemView.findViewById(R.id.item_tv);
}
}
}

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