短视频软件开发，RecyclerView实现拖拽效果

RecyclerView适配器监听ItemTouchHelper的回调，自定义RecyclerView适配器代码TestAdapter如下:

<br>package com.example.myapplication;<br>import android.content.Context;<br>import android.graphics.Color;<br>import android.view.LayoutInflater;<br>import android.view.View;<br>import android.view.ViewGroup;<br>import android.widget.TextView;<br>import androidx.annotation.NonNull;<br>import androidx.recyclerview.widget.RecyclerView;<br>import java.util.Collections;<br>import java.util.List;<br>public class TestAdapter extends RecyclerView.Adapter<TestAdapter.TestViewHolder> implements ItemMoveCallback {<br>    private Context mContext;<br>    private List<String> mTestList;<br>    public TestAdapter(Context mContext, List<String> testList) {<br>        this.mContext = mContext;<br>        this.mTestList = testList;<br>    }<br>    @Override<br>    public TestViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {<br>        return new TestViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_test, null, false));<br>    }<br>    @Override<br>    public void onBindViewHolder(final TestViewHolder holder, final int position) {<br>        holder.tvTest.setText(mTestList.get(position));<br>    }<br>    @Override<br>    public int getItemCount() {<br>        return mTestList.size();<br>    }<br>    @Override<br>    public void onItemMove(int fromPosition, int toPosition) {<br>        if (fromPosition < toPosition) {<br>            for (int i = fromPosition; i < toPosition; i++) {<br>                Collections.swap(mTestList, i, i + 1);<br>            }<br>        } else {<br>            for (int i = fromPosition; i > toPosition; i--) {<br>                Collections.swap(mTestList, i, i - 1);<br>            }<br>        }<br>        notifyItemMoved(fromPosition, toPosition);<br>    }<br>    static class TestViewHolder extends RecyclerView.ViewHolder implements ItemHolderMoveCallback{<br>        private TextView tvTest;<br>        public TestViewHolder(View itemView) {<br>            super(itemView);<br>            tvTest = (TextView) itemView.findViewById(R.id.tv_test);<br>        }<br>        @Override<br>        public void onItemHolderMoveStart() {<br>            tvTest.setTextSize(40);<br>            itemView.setBackgroundColor(Color.RED);<br>        }<br>        @Override<br>        public void onItemHolderMoveEnd() {<br>            tvTest.setTextSize(32);<br>            itemView.setBackgroundResource(R.color.colorAccent);<br>        }<br>    }<br>}

TestAdapter与RecyclerView绑定：

<br>        mRvTest.setLayoutManager(gridLayoutManager);<br>        mTestList = new ArrayList<>();<br>        for (int i = 0; i < 20; i++) {<br>            mTestList.add("测试文本" + i);<br>        }<br>        mTestAdapter = new TestAdapter(this, mTestList);<br>        mRvTest.setAdapter(mTestAdapter);

布局文件中的代码：

<br>  <androidx.recyclerview.widget.RecyclerView<br>        android:id="@+id/rv_test"<br>        android:layout_width="wrap_content"<br>        android:layout_height="wrap_content" />

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