Java android.widget.LinearLayout无法在RecyclerView中转换为android.widget.TextView？

我正在尝试使用新的回收器视图列出数据。我一直在关注这一点&现在在某一点上面临着这个问题

这是我的

MainActivity.java

package com.example.i.newworkspace;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {

TextView tv;
RecyclerView recyclerView;
RecyclerView.Adapter mAdapter;
String[] myDataset = {"One","Two","Three","Four","Five"};

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

    recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    recyclerView.setHasFixedSize(true);
    mAdapter = new MyAdapter(myDataset);
    recyclerView.setAdapter(mAdapter);

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}
 class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>

{
    String[] mDataset;

    public static class ViewHolder extends RecyclerView.ViewHolder {

        public TextView mTextView;
        public ViewHolder(TextView v) {
            super(v);
            mTextView = v;
        }
    }

    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.my_text_view, null, false);
        ViewHolder vh = new ViewHolder((TextView) v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {

        holder.mTextView.setText(mDataset[position]);

    }

    @Override
    public int getItemCount() {
        return mDataset.length;
    }

    MyAdapter(String[] myDataset) {
        mDataset = myDataset;
    }
}

第78行：

        ViewHolder vh = new ViewHolder((TextView) v);

---

您正在尝试将线性布局转换为TextView

更改此行：

ViewHolder vh=新的ViewHolder（（TextView）v）

致：

ViewHolder vh=新的ViewHolder（（TextView）v.findViewById（R.id.TextView））
您应该注意到您的我的文本视图.xml是一个线性布局，因此：

public static class ViewHolder extends RecyclerView.ViewHolder {

    public TextView mTextView;
    public ViewHolder(View v) {
        super(v);
        // Find the TextView in the LinearLayout
        mTextView = v.findViewById(R.id.textView));
    }
}

@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.my_text_view, parent, false);
    // Give the view as it is
    ViewHolder vh = new ViewHolder(v);
    return vh;
}

膨胀视图也包含根元素，因此您需要通过findviewbyid函数创建textview，然后将其传递给ViewHolder构造函数

祝你好运
清理你的项目，再试一次。@MurtazaHussain我试过了。但是，还是同样的错误。视图持有者在这里保留对相关视图的引用，所以我们应该始终给他一个“根”视图，让它找到它需要的东西。谢谢，我没有triy..我知道这会运行。但是，我更喜欢将root视图作为paramater发送。为帮助添加+1:）@Gorcyn你说得对！我忘记了根视图--user3289108谢谢：）嘿@Gorcyn，它显示数据，但不像旧格式那样以列表视图显示。我的意思是没有分隔符。我该怎么做？@user3289108这个问题的答案应该有帮助：；）
 java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView
                at com.example.i.newworkspace.MyAdapter.onCreateViewHolder(MainActivity.java:78)
                at com.example.i.nuewworkspace.MyAdapter.onCreateViewHolder(MainActivity.java:59)

        ViewHolder vh = new ViewHolder((TextView) v);

public static class ViewHolder extends RecyclerView.ViewHolder {

    public TextView mTextView;
    public ViewHolder(View v) {
        super(v);
        // Find the TextView in the LinearLayout
        mTextView = v.findViewById(R.id.textView));
    }
}

@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.my_text_view, parent, false);
    // Give the view as it is
    ViewHolder vh = new ViewHolder(v);
    return vh;
}

@Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.my_text_view, null, false);
        TextView tv=(TextView)v.findViewById(R.id.textView);
        ViewHolder vh = new ViewHolder(tv);
        return vh;
    }