android - 在单击列表视图项目上开始新活动

Question

我需要一些帮助才能在列表视图项中单击以打开新活动。我在这里看到了很多这样的问题，但没有人帮助我。

public class CustomListView extends ListActivity {

    private EfficientAdapter adap;
    ...

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);

        adap = new EfficientAdapter(this);
        setListAdapter(adap);


    }


    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);


        startActivity(new Intent(CustomListView.this, next.class));
    }


    public static class EfficientAdapter extends BaseAdapter implements Filterable {
        private LayoutInflater mInflater;
        private Bitmap mIcon1;
        private Context context;

        public EfficientAdapter(Context context) {
            // Cache the LayoutInflate to avoid asking for a new one each time.
            mInflater = LayoutInflater.from(context);
            this.context = context;
        }

        public View getView(final int position, View convertView, ViewGroup parent) {

            ViewHolder holder;


            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.adaptor_content, null);


                convertView.setOnClickListener(new OnClickListener() {
                    private int pos = position;
                    @Override
                    public void onClick(View v) {


                    }
                });



            convertView.setTag(holder);
            }else{
            // Get the ViewHolder back to get fast access to the TextView
            // and the ImageView.
            holder = (ViewHolder) convertView.getTag();
            }


            return convertView;
        }

        ...
    }
}

我还尝试在 CustomListView 类的 onCreate 方法中添加下一个代码，但它也不起作用

ListView lv = getListView();

// listening to single list item on click
lv.setOnItemClickListener(new OnItemClickListener() {
  public void onItemClick(AdapterView<?> parent, View view,
      int position, long id) {

        startActivity(new Intent(CustomListView.this, next.class));

  }
});

score 3 · Accepted Answer

onListItemClick()从您的CustomListView类中删除并将方法startActivity()放在convertView.setOnClickListener().

convertView.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        startActivity(new Intent(getApplicationContext(), two.class));
    }
});

score 1 · Accepted Answer

试试这个代码。我相信它会帮助你，不要将类设置为这样的 xml 文件；

setContentView(R.layout.second);

确保你确实把上面的代码放在你的课堂上，否则你会在打开新活动时遇到错误。

package com.exampled.list;

import android.os.Bundle;
import android.app.ListActivity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ListActivity {

    String [] names ={
        "Iphone",
        "Samsung",
        "Nokia",
        "Ericsson",
        "BlackBerry",
        "Benq"
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        setListAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,names));
    }

    public void onListItemClick(ListView Parent, View v, int position,long id){
        startActivity(new Intent(MainActivity.this, Second.class)); 
        //Toast.makeText(this, "Clicked on : " + names[position], Toast.LENGTH_LONG).show();
    }


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

}

score 0 · Accepted Answer

尝试将startActivity(new Intent(one.this, two.class));-code 放入

convertView.setOnClickListener(new OnClickListener() {
    private int pos = position;
    @Override
    public void onClick(View v) {...}
});

one.this 指的是什么？它应该是一个Context

score 0 · Accepted Answer

在你的代码one.this中是指Context.

由于您的活动名称是CustomListView，因此您应该写CustomListView.this而不是one.this。

你也可以使用getApplicationContext().

android - 在单击列表视图项目上开始新活动

4 回答 4

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