搜索數據時無法啓動搜索活動android

Question

所以我試圖編程這個搜索活動，當我在我的模擬器中執行搜索時，我得到一個錯誤在我的日誌貓說，活動不能開始，我可以不知道是什麼原因導致了這個錯誤。

搜索活動代碼：

package com.example.myfirstapp; 

import android.os.Bundle; 
import android.app.SearchManager; 
import android.app.ListActivity; 
import android.view.Menu; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.content.Intent; 
import android.database.Cursor; 
public class SearchResultsActivity extends ListActivity { 

private ListView list; 
DatabaseTable db = new DatabaseTable(this); 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(android.R.id.list); 
    handleIntent(getIntent()); 
} 

public void onNewIntent(Intent intent) { 
    setIntent(intent); 
    handleIntent(intent); 
} 

private void handleIntent(Intent intent) { 
    if (Intent.ACTION_VIEW.equals(intent.getAction())) { 
     Intent contactIntent = new Intent(this, ContactActivity.class); 
     contactIntent.setData(intent.getData()); 
     startActivity(contactIntent); 
     finish(); 
    } else if (Intent.ACTION_SEARCH.equals(intent.getAction())) { 
     String query = intent.getStringExtra(SearchManager.QUERY); 
     showResults(query); 
    } 

} 

private void showResults(String query) { 
    int name = 0; 
    String c = ""; 
    Cursor cursor = db.getContactMatches(query, null); 
    int cursor_length = db.cursorLength(cursor); 
    String[] display = new String[cursor_length]; 
    list = (ListView)findViewById(android.R.id.list); 
    int x = 0; 

    //Loading data through Cursor into String array 
    for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) 
    { 
     name = cursor.getColumnIndex(DatabaseTable.COL_NAME); 
     c = (cursor.getString(name)); 
     display[x] = c; 
     c = ""; 
     x = x + 1; 
     name = 0; 
    } 

    ArrayAdapter<String> contactAdapter = new ArrayAdapter<String>(this, 
       R.layout.activity_search_results, android.R.id.list, display); 
    list.setAdapter(contactAdapter); 
    list.setOnItemClickListener(new OnItemClickListener() { 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      Intent contactIntent = new Intent(getApplicationContext(),ContactActivity.class); 
      contactIntent.setData(getIntent().getData()); 
      startActivity(contactIntent); 
     } 
    }); 
} 

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

}

Android清單

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.myfirstapp" 
android:versionCode="1" 
android:versionName="1.0" > 

<uses-sdk 
    android:minSdkVersion="14" 
    android:targetSdkVersion="15" /> 

<application 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name=".MainActivity" 
     android:label="@string/title_activity_main" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 

     <meta-data 
      android:name="android.app.default_searchable" 
      android:value=".SearchResultsActivity" /> 
    </activity> 
    <activity 
     android:name=".SearchResultsActivity" 
     android:label="@string/title_activity_search_results" 
     android:launchMode="singleTop" > 
     <intent-filter> 
      <action android:name="android.intent.action.SEARCH" /> 
     </intent-filter> 
     <intent-filter> 
      <action android:name="android.intent.action.VIEW" /> 
     </intent-filter> 

     <meta-data 
      android:name="android.app.searchable" 
      android:resource="@xml/searchable" /> 
    </activity> 
    <activity 
     android:name=".AddContacts" 
     android:label="@string/title_activity_add_contacts" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity 
     android:name=".ContactActivity" 
     android:label="@string/title_activity_contact" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application> 

Answer 1

這裏

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(android.R.id.list); //<<<< 

您正在將ListView ID添加爲ListActivity的contentview。剛剛從ListActivity的的onCreate刪除setContentView(android.R.id.list);並添加自己的佈局Activty

和移動數據庫實例initulization onCreate方法內爲

DatabaseTable db; 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
       setContentView(R.layout.main); // <<< add activity layout here 
     db = new DatabaseTable(this); 

請參見本教程與ListView控件創建佈局：

http://www.java2s.com/Code/Android/UI/UsingImageViewwithinListActivity.htm