ListView在Android中崩潰的應用程序

Question

我有一個主菜單，其中包含4個不同的按鈕。當你點擊一個按鈕時，應該出現一個列表視圖。最後，當你在列表中選擇一個項目時，應該開始一個顯示一些文本的新活動。當我點擊Tiffins按鈕時，應用程序關閉而不是顯示列表視圖。請幫忙。

這是我的代碼。

activity_main.xml中

<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" 
android:background="@drawable/icon" 
tools:context=".MainActivity" > 

<Button 
    android:id="@+id/curries" 
    android:layout_width="150dp" 
    android:layout_height="130dp" 
    android:layout_alignParentRight="true" 
    android:layout_alignTop="@+id/tiffins" 
    android:drawableBottom="@drawable/curries" 
    android:text="@string/Curries" 
    android:onClick="CurriesMenu"/> 

<Button 
    android:id="@+id/tiffins" 
    style="@style/AppTheme" 
    android:layout_width="150dp" 
    android:layout_height="130dp" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:layout_marginTop="40dp" 
    android:drawableBottom="@drawable/tiffins" 
    android:text="@string/Tiffins" 
    android:onClick="TiffinsMenu"/> 

<TextView 
    android:id="@+id/textView2" 
    android:layout_width="100dp" 
    android:layout_height="30dp" 
    android:layout_alignBottom="@+id/textView1" 
    android:layout_alignParentLeft="true" 
    android:layout_marginLeft="19dp" 
    android:text="@string/Tiffins" 
    android:textSize="25dp" /> 

<TextView 
    android:id="@+id/textView1" 
    android:layout_width="100dp" 
    android:layout_height="30dp" 
    android:layout_above="@+id/curries" 
    android:layout_alignLeft="@+id/curries" 
    android:layout_marginLeft="24dp" 
    android:text="@string/Curries" 
    android:textSize="25dp" /> 

<TextView 
    android:id="@+id/textView3" 
    android:layout_width="100dp" 
    android:layout_height="30dp" 
    android:layout_alignLeft="@+id/textView2" 
    android:layout_centerVertical="true" 
    android:text="@string/Snacks" 
    android:textSize="25dp" /> 

<Button 
    android:id="@+id/Snacks" 
    android:layout_width="150dp" 
    android:layout_height="130dp" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/textView3" 
    android:drawableBottom="@drawable/snacks" 
    android:text="@string/Snacks" 
    android:onClick="SnacksMenu" /> 

<TextView 
    android:id="@+id/textView4" 
    android:layout_width="100dp" 
    android:layout_height="30dp" 
    android:layout_alignBaseline="@+id/textView3" 
    android:layout_alignBottom="@+id/textView3" 
    android:layout_alignLeft="@+id/curries" 
    android:layout_alignParentRight="true" 
    android:text="@string/Pindivantalu" 
    android:textSize="25dp" /> 

<Button 
    android:id="@+id/pindivantalu" 
    android:layout_width="150dp" 
    android:layout_height="130dp" 
    android:layout_alignBottom="@+id/Snacks" 
    android:layout_alignParentRight="true" 
    android:drawableBottom="@drawable/pindivantalu" 
    android:text="@string/Pindivantalu" 
    android:onClick="PindivantaluMenu" /> 

activity_display_tiffinsmenu.xml

<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" 
tools:context=".DisplayTiffinsmenu" > 

<ListView 
    android:id="@+id/listView1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_centerVertical="true" 
    android:background="@drawable/tiffins1" 
    android:entries="@array/tiffinslist" > 

</ListView> 

MainActivity.java

package com.example.andhrarecipies; 

import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.view.Menu; 
import android.view.View; 

public class MainActivity extends Activity { 

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

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

    public void TiffinsMenu(View view){ 
     Intent intent = new Intent(this, DisplayTiffinsmenu.class); 
     startActivity(intent); 
    } 

    public void CurriesMenu(View view){ 
     Intent intent = new Intent(this, DisplayCurriesmenu.class); 
     startActivity(intent); 
    } 

    public void SnacksMenu(View view){ 
     Intent intent = new Intent(this, DisplaySnacksmenu.class); 
     startActivity(intent); 
    } 

    public void PindivantaluMenu(View view){ 
     Intent intent = new Intent(this, DisplayPindivantalumenu.class); 
     startActivity(intent); 

    } 

} 

DisplayTiffinsmenu.java

package com.example.andhrarecipies; 

import java.util.ArrayList; 

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

public class DisplayTiffinsmenu extends ListActivity { 

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

     ListView TiffinsMenu = (ListView) this.findViewById(R.id.listView1); 
     String[] menu = getResources().getStringArray(R.array.tiffinslist); 

     setListAdapter(new ArrayAdapter<String>(this, R.layout.activity_display_tiffinsmenu, menu)); 

    } 

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 
     // TODO Auto-generated method stub 
     super.onListItemClick(l, v, position, id); 
     Object o = this.getListAdapter().getItem(position); 
     String keyword = o.toString(); 
      Toast.makeText(this, "you have selected" + keyword, 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.activity_display_tiffinsmenu, menu); 
     return true; 
    } 

} 

Answer 1

使用ListActivity，您activity_display_tiffinsmenu.xml -layout必須包含一個ListView與android:id屬性設置爲@android:id/list這樣的：

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