Question

过去2天我无法纠正以下代码问题。我不知道如何将自定义列表项添加到现有网格视图。我已经完成并编译了这段代码而没有任何错误。但遗憾的是，点击网格视图字母后，可点击不会出现此问题。我的要求就像这样：如果按下网格视图字母[“A”]，应转到另一个布局，并应显示项目列表[任何列表/图标菜单/带图标的列表]。所以请尽快让我摆脱这个问题。我使用的代码：

GridViewActivity.java

public class GridViewActivity extends Activity {

    GridView gridView;
    static final String[] numbers = new String[]{
            "A", "B", "C", "D", "E",
            "F", "G", "H", "I", "J",
            "K", "L", "M", "N", "O",
            "P", "Q", "R", "S", "T",
            "U", "V", "W", "X", "Y", "Z"};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.content_main);

        gridView = (GridView) findViewById(R.id.gridView1);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, numbers);

        gridView.setAdapter(adapter);

        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v,
                                    int position, long id) {
               Toast.makeText(getApplicationContext(),
                       ""+position, Toast.LENGTH_SHORT).show();
                Intent intent = null;
                if(position == 0){
                    intent = new Intent(v.getContext(), ListActivity.class);
                   // intent.putExtra("title", list.add(list));
                }
                if(position == 1){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 2){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 3){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position ==4){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 5){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 6){
                    intent = new Intent(v.get Context(), List Activity.class);}
                if(position == 7){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 8){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 9){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 10){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 11){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 12) {
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 13){
                intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 14){
                    intent = new Intent(v.get Context(), List Activity.class);
                }
                if(position == 15){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 16){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 17){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 18){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 19){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 20){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 21){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 22){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 23){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 23){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 24){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 25){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                if(position == 26){
                    intent = new Intent(v.getContext(), ListActivity.class);
                }
                startActivity(intent);
            }
        });

    }
}

main.xml中：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:entries="@array/list"
        android:layout_centerHorizontal="true" >
    </ListView>

</RelativeLayout>

ListActivity.java：

package com.example.brahmaiah.grid_view;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

/**
 * Created by brahmaiah on 1/29/2016.
 */
public class ListActivity extends Activity {

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_grid_view, menu);
        return true;
    }
}

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridView1"
    android:numColumns="auto_fit"
    android:gravity="center"
    android:columnWidth="50dp"
    android:stretchMode="columnWidth"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
</GridView>

我认为这些内容足以理解此应用代码的问题。 o / p就像...网格视图一直在显示但是在点击网格视图之后，像{A，B ...}这样的项目正在显示这样的消息。不幸的是，列表活动关闭了

Answer 1

首先清理你的代码，消除所有那些不必要的“if”块。然后在代码中更改以下行：

intent = new Intent(v.getContext(), ListActivity.class);

到

intent = new Intent(getApplicationContext(), ListActivity.class);

修改另外，检查ListActivity是否在您的清单中：

<activity android:name=".ListActivity"></activity>

如何解决以下代码错误执行添加自定义列表到gridView可点击？

1 个答案: