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思路:onScrollStateChanged 用于监听RecyclerView滑动状态
crollState =SCROLL_STATE_IDLE(0) = RecyclerView.SCROLL_STATE_IDLE :表示屏幕已停止。屏幕停止滚动时为0
效果:
核心代码
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
// OnScrollListener.SCROLL_STATE_IDLE; //停止滑动状态
// 记录当前滑动状态
if (newState == RecyclerView.SCROLL_STATE_IDLE) { //当前状态为停止滑动
Log.d(TAG, "SCROLL_STATE_IDLE=" + (newState == RecyclerView.SCROLL_STATE_IDLE));
if (!workSelectRv.canScrollVertically(1)) { // 到达底部
Log.d(TAG, "到达底部");
Toast.makeText(RecyclerViewScrollBottom.this, "我是有底线的", Toast.LENGTH_SHORT).show();
} else if (!workSelectRv.canScrollVertically(-1)) { // 到达顶部
Toast.makeText(recyclerView.getContext(), "到顶了", Toast.LENGTH_SHORT).show();
Log.d(TAG, "到顶了");
}
}
}
完整实现代码:
package com.example.mvpfour.spn;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;
import com.example.mvpfour.R;
public class RecyclerViewScrollBottom extends AppCompatActivity {
private RecyclerView workSelectRv;
private LinearLayoutManager linearLayoutManager;
private static final String TAG = "GsonUtils";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.rec_sro_bt);
initView();
initRecyclerViewMassage();
}
private void initView() {
workSelectRv = (RecyclerView) findViewById(R.id.work_select_rv);
}
private void initRecyclerViewMassage() {
linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
workSelectRv.setLayoutManager(linearLayoutManager);
workSelectRv.setAdapter(myAdapterMassage);
//onScroll 用于监听RecyclerView屏幕滚动
workSelectRv.addOnScrollListener(loadingMoreListener);
}
RecyclerView.OnScrollListener loadingMoreListener = new RecyclerView.OnScrollListener() {
//到达顶部和底部监听
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
// OnScrollListener.SCROLL_STATE_IDLE; //停止滑动状态
// 记录当前滑动状态
if (newState == RecyclerView.SCROLL_STATE_IDLE) { //当前状态为停止滑动
Log.d(TAG, "SCROLL_STATE_IDLE=" + (newState == RecyclerView.SCROLL_STATE_IDLE));
if (!workSelectRv.canScrollVertically(1)) { // 到达底部
Log.d(TAG, "到达底部");
Toast.makeText(RecyclerViewScrollBottom.this, "我是有底线的", Toast.LENGTH_SHORT).show();
} else if (!workSelectRv.canScrollVertically(-1)) { // 到达顶部
Toast.makeText(recyclerView.getContext(), "到顶了", Toast.LENGTH_SHORT).show();
Log.d(TAG, "到顶了");
}
}
}
};
RecyclerView.Adapter myAdapterMassage = new RecyclerView.Adapter() {
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
// View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.work_select_item, parent,false);
TextView textView = new TextView(parent.getContext());
textView.setText("测试数据");
textView.setHeight(60);
textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 18);
return new MyViewHolderBot(textView);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
}
@Override
public int getItemCount() {
return 39;
}
};
public static class MyViewHolderBot extends RecyclerView.ViewHolder {
private CheckBox checkBox;
private TextView work_message;
public MyViewHolderBot(View itemView) {
super(itemView);
checkBox = (CheckBox) itemView.findViewById(R.id.work_check);
work_message = (TextView) itemView.findViewById(R.id.work_message);
}
}
}
布局文件work_select_rv.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/work_select_rv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
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