Question

我正在android中开发一个应用程序，我在其中创建了几个项目的列表视图。我想在每个列表项上点击一个类click.Here是我的代码

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import com.example.listview.abc;

public class listview extends Activity implements OnItemClickListener {
    public ListView lv1;
    public String[] names = { "Abc", "Xyz", "Pqr", "Jap", "Jay",
            "bla bla" };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        lv1 = (ListView) findViewById(R.id.list);
        lv1.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, names));
        lv1.setOnItemClickListener(this);
    }


    @Override
    public void onItemClick(AdapterView<?> a, View v, int position, long id) {
         if(position==0){
             Intent i = new Intent(this, abc.class);
             startActivity(i);
            //Toast.makeText(this, "You pressed the first item in the list",
                //  Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "You pressed all other items in the list",
                    Toast.LENGTH_SHORT).show();

        }
         // else if(position==1){
            // start another activity here...
    }

问题是，当我点击第一个项目时它会崩溃，但点击其他项目会显示该消息，但是当我点击下一个活动的项目时它会崩溃我试图遵循stackoverflow的这个问题，但它没有奏效 { How to jump from ListView to next Activity } 这是log cat的一部分

06-09 12:29:52.111: DEBUG/AndroidRuntime(903): Shutting down VM
06-09 12:29:52.181: INFO/AndroidRuntime(903): NOTE: attach of thread 'Binder Thread #3' failed
06-09 12:29:52.181: INFO/ActivityManager(60): Start proc com.example.listview for activity com.example.listview/.listview: pid=910 uid=10039 gids={}
06-09 12:29:52.310: DEBUG/dalvikvm(903): Debugger has detached; object registry had 1 entries
06-09 12:29:54.670: INFO/ActivityManager(60): Displayed activity com.example.listview/.listview: 2616 ms (total 199904 ms)
06-09 12:29:55.249: DEBUG/dalvikvm(253): GC_EXPLICIT freed 176 objects / 12384 bytes in 3461ms
06-09 12:29:59.940: DEBUG/dalvikvm(125): GC_EXPLICIT freed 878 objects / 48664 bytes in 188ms
06-09 12:30:05.270: DEBUG/dalvikvm(262): GC_EXPLICIT freed 46 objects / 2240 bytes in 183ms
06-09 12:30:50.140: DEBUG/SntpClient(60): request time failed: java.net.SocketException: Address family not supported by protocol
06-09 12:32:52.731: DEBUG/dalvikvm(120): GC_FOR_MALLOC freed 9850 objects / 473648 bytes in 1222ms
06-09 12:35:50.171: DEBUG/SntpClient(60): request time failed: java.net.SocketException: Address family not supported by protocol
06-09 12:40:50.240: DEBUG/SntpClient(60): request time failed: java.net.SocketException: Address family not supported by protocol
06-09 12:45:50.311: DEBUG/SntpClient(60): request time failed: java.net.SocketException: Address family not supported by protocol

最明显的文件是

**

**

<?xml version="1.0" encoding="utf-8"?>
>     <manifest xmlns:android="http://schemas.android.com/apk/res/android"
>       package="com.example.listview" android:versionCode="1"
>       android:versionName="1.0">
>       <application android:icon="@drawable/icon" android:label="@string/app_name">
>           <activity android:name=".listview" android:label="@s tring/app_name">
>           
>               <intent-filter>
>                   <action android:name="android.intent.action.MAIN" />
>                   <category android:name="android.intent.category.LAUNCHER" />
>               </intent-filter>
>           </activity>
>     
>           <activity android:enabled="true" android:name="abc" />
>       </application>
>       <uses-sdk android:minSdkVersion="3" />
>            <uses-permission android:name="android.permission.INTERNET" />
>     </manifest>

**

请查看代码并帮我解决

提前致谢..

Answer 1

public class ListItemIntent extends Activity implements OnItemClickListener {   
    ListView lv1;
    String[] names = { "Abc", "Xyz", "Pqr", "Jap", "Jay", "Blabla" };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        lv1 = (ListView) findViewById(R.id.list);
        lv1.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, names));
        lv1.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        Intent intent;
        switch (arg2) {
            case 0:
                intent= new Intent(this,Abc.class);
                startActivity(intent);
                break;
            case 1:
                intent=new Intent(this,Xyz.class);
                startActivity(intent);
                break;
            case 2:
                intent=new Intent(this,Pqr.class);
                startActivity(intent);  
                break;
            case 3:
                intent=new Intent(this,Jap.class);
                startActivity(intent);      
                break;
            case 4:
                intent=new Intent(this,Jay.class);
                startActivity(intent);          
                break;
            case 5:
                intent=new Intent(this,Blabla.class);
                startActivity(intent);          
                break;  
            default:
                break;
        }       
    }
}

对于每个类，您必须在Androidmanifest.xml中添加Activity。并且表现得像..

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".ListItemIntent"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name="Abc"></activity>
    <activity android:name="Blabla"></activity>
    <activity android:name="Jap"></activity>
    <activity android:name="Jay"></activity>
    <activity android:name="Pqr"></activity>
    <activity android:name="Xyz"></activity>
</application>

Answer 2

您是否在AndroidManifest.xml文件中正确注册了abc.class作为活动？这会导致崩溃。

Answer 3

请在AndroidManifest.xml中更改以下

 <activity android:name=".abc" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
 </activity>

还添加以下行

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

然后尝试一下。

如果不成功，请检查以下链接。

DEBUG/SntpClient(60): request time failed: java.net.SocketException: Address family not supported by protocol

http://developer.appcelerator.com/question/117360/javanetsocketexception-address-family-not-supported-by-protocol

Answer 4

<activity android:name="com.something.something.abc" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.ABC" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
 </activity>
<activity android:name="something.package.something.xyz" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.XYZ" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
 </activity>

只是一个例子尝试......

如何进入列表项单击特定活动？

4 个答案: