android-intent - 如何从自定义 ListView 中单击项目启动不同的 Activity ？

Question

我遵循了许多教程，例如 http://www.javacodegeeks.com/2013/09/android-listview-with-adapter-example.html还关注了此处提出的问题 How to make custom ListView to open other activities when clicking list item?然而，在尝试此处的答案(How to make custom ListView to open other activities when clicking list item?)后，每当我从 ListView 中选择一个项目时，我的应用程序就会停止。我的主要 Activity 代码:

public class MainActivity extends Activity {
	  ListView list;
	  String[] web = {
			  "Notifications",
			  "School",
			  "What's Hot",
			  "Tell a friend",
			  "Hit us up",
			  "Settings",
			  "About & Help"
	  };
@Override
	  protected void onCreate(Bundle savedInstanceState) {
	    super.onCreate(savedInstanceState);
	    setContentView(R.layout.activity_main);
	    CustomList adapter = new
	        CustomList(MainActivity.this, web, imageId);
	    list=(ListView)findViewById(R.id.list);
	        list.setAdapter(adapter);
	        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
	        	@Override
                public void onItemClick(AdapterView<?> parent, View view,
                                        int position, long id) {
	        		switch(position){
	        		case 0:  Intent newActivity = new Intent(MainActivity.this, Notifications.class);     
	                startActivity(newActivity);
	                break;
	       case 1:  Intent newActivity1 = new Intent(MainActivity.this, School.class);     
	                startActivity(newActivity1);
	                break;
	       case 2:  Intent newActivity2 = new Intent(MainActivity.this, Whats_hot.class);     
	                startActivity(newActivity2);
	                break;
	       case 3:  Intent newActivity3 = new Intent(MainActivity.this, Tellafriend.class);     
	                startActivity(newActivity3);
	                break;
	       case 4:  Intent newActivity4 = new Intent(MainActivity.this, Hitusup.class);     
	                startActivity(newActivity4);
	                break;
	       case 5:  Intent newActivity5 = new Intent(MainActivity.this, Settings.class);     
           startActivity(newActivity5);
           break;
  case 6:  Intent newActivity6 = new Intent(MainActivity.this, AboutHelp.class);     
           startActivity(newActivity6);
           break;
  
	        	 }
	        	
	        	}
	        @SuppressWarnings("unused")
	        public void onClick(View v){ 
      };
    });}
}

以下是尝试启动的其中一项 Activity (学校)的代码:

public class School extends Activity{
	public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.detail);
	
	
	Intent newActivity1=new Intent();
	setResult(RESULT_OK, newActivity1);
    finish();
	}

}

在我的 list 上我添加了以下内容:

</activity>
        <activity android:name=".Notifications"></activity>
            <activity android:name=".School"></activity>
                <activity android:name=".Whats_hot"></activity>
                    <activity android:name=".Tellafriend"></activity>
                        <activity android:name=".Hitusup"></activity>
                            <activity android:name=".Settings"></activity>
                                <activity android:name=".AboutHelp">
            

我的日志猫:11-10 14:25:58.080: W/dalvikvm(13150): 拒绝重新启动 DEX '/system/framework/hwframework.jar'11-10 14:25:59.360:I/Adreno200-EGL(13150)::EGL 1.4高通版本:AU_LINUX_ANDROID_JB_REL_2.0.3.04.01.01.21.010_msm8625_JB_REL_2.0.3_Merge_release_AU(合并)11-10 14:25:59.360:I/Adreno200-EGL(13150):构建日期:2012 年 10 月 26 日星期五11-10 14:25:59.360:I/Adreno200-EGL(13150):本地分支机构:11-10 14:25:59.360:I/Adreno200-EGL(13150):远程分支:quic/jb_rel_2.0.311-10 14:25:59.360:I/Adreno200-EGL(13150):本地补丁:无11-10 14:25:59.360:I/Adreno200-EGL(13150):重建分支:AU_LINUX_ANDROID_JB_REL_2.0.3.04.01.01.21.010 +无11-10 14:26:00.450:我/Choreographer(13150):跳过了 90 帧!应用程序可能在其主线程上做了太多工作。11-10 14:26:03.230: W/dalvikvm(13150): threadid=1: 线程因未捕获的异常而退出 (group=0x413fe438)

有一些我看不到的问题。我是 Android 开发新手，非常感谢你们的帮助。

Answer 1

您的代码运行良好。我是在没有 Customadapter 的情况下做到的。您需要的一切都在下面。

MainActivity.java

public class MainActivity extends Activity {


    String[] web = {
              "Notifications",
              "School",
              "What's Hot",
              "Tell a friend",
              "Hit us up",
              "Settings",
              "About & Help"
      };

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

      ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
      R.layout.activity_listview, web);

      ListView list = (ListView) findViewById(R.id.list);
      list.setAdapter(adapter);

      list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
          @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                switch(position){
                case 0:  Intent newActivity = new Intent(MainActivity.this, School.class);     
                startActivity(newActivity);
                break;


             }

            }
        @SuppressWarnings("unused")
        public void onClick(View v){ 
            };
        });

   }//end oncreate


}//endactivity

学校.java

public class School extends Activity{
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.school);


    Intent newActivity1=new Intent();
    setResult(RESULT_OK, newActivity1);
    //finish();
}

}

activity_mainlist.xml

<LinearLayout 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"
android:orientation="vertical"
tools:context=".ListActivity" >

   <ListView
   android:id="@+id/list"
   android:layout_width="match_parent"
   android:layout_height="wrap_content" >
   </ListView>

 </LinearLayout>

activity_listview.xml

<?xml version="1.0" encoding="utf-8"?>
<!--  Single List Item Design -->
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/label"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dip"
    android:textSize="16dip"
    android:textStyle="bold" >
</TextView>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.zzztest2"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="16"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name">
    <activity
        android:name=".MainActivity"
        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="com.example.zzztest2.School" android:label="@string/app_name"> </activity>
</application>