单击列表视图项时是否打开活动？

Question

I'm trying to built this app which simple consist of a ListView and different other activities that will be called when an item from the view is clicked. I want to when i pressed string Rumus Ekonomi it will open RumusEkonomi.class but when I click string Rumus Ekonomi , it force closes.

here the code:

public class Beranda extends ListActivity
{ String [] items = { "Rumus Ekonomi", "Rumus Manajemen", "Rumus Akutansi" };

public void onCreate(Bundle icicle) 
{
    super.onCreate(icicle);
    setContentView(R.layout.beranda_layout);
    setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items));
}

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

    if (position == 0) 
    {
        Intent intent1 = new Intent(this, RumusEkonomi.class);
        startActivity(intent1);
    }
    else if (position == 1) 
    {
        Intent intent2 = new Intent(this, RumusManajemen.class);
        startActivity(intent2);
    }
    else if (position == 2) 
    {
        Intent intent3 = new Intent(this, RumusAkutansi.class);
        startActivity(intent3);
    } 
}}

Any help would be appreciated :)

UPDATE

Here is code manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.rumus"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.rumus.Rumus"
        android:label="@string/app_name">
   </activity>
   <activity android:name=".Beranda" 
        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=".RumusEkonomi"
        android:label="@string/app_name" >    
    </activity> 
</application>
</manifest>

First i declare <intent-filter> to android:name="com.example.rumus.Rumus" but when i click, it forces closes. so i move the <intent-filter> to <activity android:name=".Beranda" but it forces closes too

Answer 1

Use this where you are using intent:

Intent intent1 = new Intent(getApplicationContext(), YourClassName.class);  //Change here use getApplicationContext()
startActivity(intent1);

Instead of this:

Intent intent1 = new Intent(this, YourClassName.class);
startActivity(intent1);

Answer 2

You will need to provide an appropriate context to your Intents. Change your onListItemClick() block to the following

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

if (position == 0) {
    Intent intent1 = new Intent(Beranda.this, RumusEkonomi.class);
    startActivity(intent1);
}
else if (position == 1) {
    Intent intent2 = new Intent(Beranda.this, RumusManajemen.class);
    startActivity(intent2);
}
else if (position == 2) {
    Intent intent3 = new Intent(Beranda.this, RumusAkutansi.class);
    startActivity(intent3);
} 
}

Edit: Change your Manifest file to this

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

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
   <activity android:name=".Beranda" 
             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=".RumusEkonomi"
        android:label="@string/app_name" >    
   </activity> 
   <activity
        android:name=".RumusManajemen"
        android:label="@string/app_name" >
   </activity>
   <activity
        android:name=".RumusAkutansi"
        android:label="@string/app_name" >
   </activity>
</application>
</manifest>

Answer 3

确保您在beranda_layout中的列表视图中使用的是android：id =“ @ android：id / list”。