android 自动上下翻滚,自动滚动的RecyclerView（水平和垂直方向）

自动滚动的RecyclerView(水平和垂直方向)

自动滚动的RecyclerView(水平和垂直方向)

自动滚动的RecyclerView 所以需要写一个类继承 RecyclerView  代码如下：

import android.content.Context;

import android.support.annotation.Nullable;

import android.support.v7.widget.RecyclerView;

import android.util.AttributeSet;

import android.view.MotionEvent;

import java.lang.ref.WeakReference;

public class AutoPollRecyclerView extends RecyclerView {

private static final long TIME_AUTO_POLL = 16;

AutoPollTask autoPollTask;

private boolean running; //标示是否正在自动轮询

private boolean canRun;//标示是否可以自动轮询,可在不需要的是否置false

public AutoPollRecyclerView(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

autoPollTask = new AutoPollTask(this);

}

static class AutoPollTask implements Runnable {

private final WeakReference mReference;

//使用弱引用持有外部类引用->防止内存泄漏

public AutoPollTask(AutoPollRecyclerView reference) {

this.mReference = new WeakReference(reference);

}

@Override

public void run() {

AutoPollRecyclerView recyclerView = mReference.get();

if (recyclerView != null && recyclerView.running && recyclerView.canRun) {

recyclerView.scrollBy(2, 2);

recyclerView.postDelayed(recyclerView.autoPollTask, recyclerView.TIME_AUTO_POLL);

}

}

}

//开启:如果正在运行,先停止->再开启

public void start() {

if (running)

stop();

canRun = true;

running = true;

postDelayed(autoPollTask, TIME_AUTO_POLL);

}

public void stop() {

running = false;

removeCallbacks(autoPollTask);

}

@Override

public boolean onTouchEvent(MotionEvent e) {

switch (e.getAction()) {

case MotionEvent.ACTION_DOWN:

if (running)

stop();

break;

case MotionEvent.ACTION_UP:

case MotionEvent.ACTION_CANCEL:

case MotionEvent.ACTION_OUTSIDE:

if (canRun)

start();

break;

}

return super.onTouchEvent(e);//return  false，注释掉onTouchEvent()方法里面的stop和start方法，则列表自动滚动且不可触摸

}

}

适配器的写法如下代码：

import android.content.Context;

import android.support.v7.widget.RecyclerView;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import java.util.List;

public class AutoPollAdapter extends RecyclerView.Adapter {

private final Context mContext;

private final List mData;

public AutoPollAdapter(Context context, List list) {

this.mContext = context;

this.mData = list;

}

@Override

public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

View view = LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false);

BaseViewHolder holder = new BaseViewHolder(view);

return holder;

}

@Override

public void onBindViewHolder(BaseViewHolder holder, int position) {

String data = mData.get(position % mData.size());

holder.content.setText(data);

}

@Override

public int getItemCount() {

return Integer.MAX_VALUE;

}

class BaseViewHolder extends RecyclerView.ViewHolder {

TextView content;

public BaseViewHolder(View itemView) {

super(itemView);

content = (TextView) itemView.findViewById(R.id.content);

}

}

}

Activity调用的写法：

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

List   mData = new ArrayList<>();

for (int i = 0; i < 30; i++) {

mData.add("加载的第" + i + "条数据");

}

AutoPollRecyclerView  recyclerView = (AutoPollRecyclerView) findViewById(R.id.recyclerView);

recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));//设置LinearLayoutManager.HORIZONTAL  则水平滚动

AutoPollAdapter  mAdapter = new AutoPollAdapter(this, mData);

recyclerView.setAdapter(mAdapter);

recyclerView.start();//不能掉，不然不会自动滚动，根据自己的需求来

}

}

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