Android：使用光标适配器显示来自sqlite的数据

-1

我正在制作一个应用程序，将数据保存在数据库中。当我尝试运行代码时，它工作正常，但是当我单击打开按钮“我的应用程序崩溃”时。我张贴下面的代码，请有VivzHelper.java看看它Android：使用光标适配器显示来自sqlite的数据

MainActivity.java

import android.content.Intent; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.ListView; 

public class MainActivity extends AppCompatActivity { 


    VivzHelper vivzHelper; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     vivzHelper= new VivzHelper(this); 

     // vivzHelper.insertEntry(); 


     // vivzHelper.deleteAll(); 
     SQLiteDatabase data = vivzHelper.getWritableDatabase(); 




     // Cursor todoCursor = data.rawQuery("Select * from books", null); 
     // ListView lvItems = (ListView) findViewById(R.id.list); 
     // TodoCursorAdapter todoAdapter = new TodoCursorAdapter(this, todoCursor); 
     // lvItems.setAdapter(todoAdapter); 


    } 
    public void openinfo() 
    { 
     Intent intent = new Intent(this, ShowData.class); 
     startActivity(intent); 
    } 




}

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.os.Message; 

import java.util.HashMap; 


/** 
* Created by Akash on 3/13/2016. 
*/ 



public class VivzHelper extends SQLiteOpenHelper { 


    private static final String DATABASE_NAME = "hit_lib1"; 
    private static final String TABLE_NAME = "books"; 
    private static final int DATABASE_VERSION = 7; 
    private static final String UID = "_id"; 
    private static final String Name = "Name"; 
    private static final String ADDRESS = "Address"; 
    private static final String CREATE_TABLE = "CREATE TABLE "+TABLE_NAME+" ("+UID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+Name+" VARCHAR(25), "+ADDRESS+" VARCHAR(255));"; 
    private static final String DROP_TABLE = "DROP TABLE IF EXISTS "+TABLE_NAME; 
    private Context context; 



    public VivzHelper(Context context) 
    { 
     super(context,DATABASE_NAME,null,DATABASE_VERSION); 
     this.context=context; 
     appscreator.com.mydatabase.Message.message(context, "Constructor Called"); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 


     try { 

      db.execSQL(CREATE_TABLE); 


      appscreator.com.mydatabase.Message.message(context, "onCreate Called"); 
     } 
     catch (SQLException e) { 

      appscreator.com.mydatabase.Message.message(context, "" + e); 
     } 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int i, int i1) { 

     try { 

      db.execSQL(DROP_TABLE); 
      appscreator.com.mydatabase.Message.message(context, "onUpgrade Called"); 
      onCreate(db); 
     } catch (SQLException e) { 
      appscreator.com.mydatabase.Message.message(context, "" + e); 


     } 

    } 


    public void insertEntry() 
    { 

     try 
     { 
      SQLiteDatabase db = this.getWritableDatabase(); 

      ContentValues values = new ContentValues(); 
      ContentValues values1 = new ContentValues(); 

      // values.put("Messsage", msg); 
      values1.put("Name", "Aka"); 
      values1.put("Address", "Pu"); 
      values.put("Name", "Pra"); 
      values.put("Address", "Nid"); 

      db.insert("books ", null, values1); 
      db.insert("books ", null, values); 
      appscreator.com.mydatabase.Message.message(context, "Inserted Successfully"); 

     } 
     catch (Exception e) 
     { 
      appscreator.com.mydatabase.Message.message(context,""+e); 
     } 

    } 

    public int deleteAll(){ 
     SQLiteDatabase db = this.getWritableDatabase(); 
     return db.delete(TABLE_NAME, null, null); 
    } 

    public Cursor getDetails() 
    { 
     SQLiteDatabase db = getReadableDatabase(); 
     return db.rawQuery("select * from books", null); 
    } 
}

TodoCursorAdapter.java

import android.content.Context; 
import android.database.Cursor; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.CursorAdapter; 
import android.widget.TextView; 

/** 
* Created by Akash on 3/13/2016. 
*/ 
public class TodoCursorAdapter extends CursorAdapter { 
    public TodoCursorAdapter(Context context, Cursor cursor, int flags) { 
     super(context, cursor, 0); 
    } 

    // The newView method is used to inflate a new view and return it, 
    // you don't bind any data to the view at this point. 
    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup parent) { 
     return LayoutInflater.from(context).inflate(R.layout.list_view, parent, false); 
    } 

    // The bindView method is used to bind all data to a given view 
    // such as setting the text on a TextView. 
    @Override 
    public void bindView(View view, Context context, Cursor cursor) { 
     // Find fields to populate in inflated template 
     TextView tvBody = (TextView) view.findViewById(R.id.id); 
     TextView tvPriority = (TextView) view.findViewById(R.id.name); 
     TextView address = (TextView) view.findViewById(R.id.add); 
     // Extract properties from cursor 
     int body = cursor.getInt(cursor.getColumnIndexOrThrow("body")); 
     String priority = cursor.getString(cursor.getColumnIndexOrThrow("priority")); 
     String add = cursor.getString(cursor.getColumnIndexOrThrow("address")); 
     // Populate fields with extracted properties 

     tvPriority.setText(String.valueOf(body)); 
     tvBody.setText(priority); 
     address.setText(add); 
    } 
}

ShowData.java

import android.app.ListActivity; 
import android.database.Cursor; 
import android.os.Bundle; 

/** 
* Created by Akash on 3/13/2016. 
*/ 
public class ShowData extends ListActivity { 
    private VivzHelper helper; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     VivzHelper empClick = new VivzHelper(getApplicationContext()); 
     Cursor cursor = empClick.getDetails(); 
     if (cursor != null) 
      getListView().setAdapter(
        new android.support.v4.widget.SimpleCursorAdapter(this, R.layout.display, cursor, new String[]{ 
          "uid", "Name", "Address" 
        }, new int[]{R.id.id, R.id.name, R.id.add}, 0)); 
    } 
}

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:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> 

    <TextView android:text="@string/hello_world" android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Open" 
     android:onClick="openinfo" 
     android:id="@+id/button" 
     android:layout_below="@+id/textView" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="52dp" /> 

</RelativeLayout>

display.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="horizontal" > 
    <TextView 
     android:id="@+id/id" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Study cursors" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 
    <TextView 
     android:id="@+id/name" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginLeft="10dp" 
     android:text="3" 
     android:textAppearance="?android:attr/textAppearanceMedium" /> 

    <TextView 
     android:id="@+id/add" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginLeft="10dp" 
     android:text="3" 
     android:textAppearance="?android:attr/textAppearanceMedium" /> 
</LinearLayout>

list_view.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

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

</LinearLayout>

的logcat的细节

03-13 14:37:29.896 2419-2419/? E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: appscreator.com.mydatabase, PID: 2419 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{appscreator.com.mydatabase/appscreator.com.mydatabase.ShowData}: java.lang.IllegalArgumentException: column 'uid' does not exist 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
      at android.app.ActivityThread.access$800(ActivityThread.java:151) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:135) 
      at android.app.ActivityThread.main(ActivityThread.java:5254) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:372) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
    Caused by: java.lang.IllegalArgumentException: column 'uid' does not exist 
      at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:303) 
      at android.support.v4.widget.SimpleCursorAdapter.findColumns(SimpleCursorAdapter.java:317) 
      at android.support.v4.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:92) 
      at appscreator.com.mydatabase.ShowData.onCreate(ShowData.java:19) 
      at android.app.Activity.performCreate(Activity.java:5990) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
            at android.app.ActivityThread.access$800(ActivityThread.java:151) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:135) 
            at android.app.ActivityThread.main(ActivityThread.java:5254) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:372) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
03-13 14:37:29.904  763-1044/? W/ActivityManager﹕ Force finishing activity 1 appscreator.com.mydatabase/.ShowData 
03-13 14:37:29.916  763-1044/? W/ActivityManager﹕ Force finishing activity 2 appscreator.com.mydatabase/.MainActivity 
03-13 14:37:29.963  763-784/? W/ViewRootImpl﹕ Dropping event due to no window focus: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=48208, eventTime=3114859, downTime=610179, deviceId=1, source=0x301 } 
03-13 14:37:29.974  763-784/? W/ViewRootImpl﹕ Dropping event due to no window focus: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=48209, eventTime=3115057, downTime=610179, deviceId=1, source=0x301 } 
03-13 14:37:30.058  763-1931/? I/OpenGLRenderer﹕ Initialized EGL, version 1.4 
03-13 14:37:30.165  763-1931/? W/EGL_emulation﹕ eglSurfaceAttrib not implemented 
03-13 14:37:30.165  763-1931/? W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0x9e824820, error=EGL_SUCCESS 
03-13 14:37:30.230  763-784/? W/ViewRootImpl﹕ Dropping event due to no window focus: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=48210, eventTime=3115112, downTime=610179, deviceId=1, source=0x301 } 
03-13 14:37:30.760  763-784/? W/ActivityManager﹕ Activity pause timeout for ActivityRecord{14c9567f u0 appscreator.com.mydatabase/.ShowData t334 f} 
03-13 14:37:31.172 1031-1311/? W/EGL_emulation﹕ eglSurfaceAttrib not implemented 
03-13 14:37:31.172 1031-1311/? W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa083cf40, error=EGL_SUCCESS 
03-13 14:37:32.023  862-862/? W/ResourceType﹕ No package identifier when getting value for resource number 0x00000000 
03-13 14:37:32.024  862-862/? W/PackageManager﹕ Failure retrieving resources for appscreator.com.mydatabase: Resource ID #0x0 
03-13 14:37:32.025 1031-1311/? W/OpenGLRenderer﹕ Incorrectly called buildLayer on View: ShortcutAndWidgetContainer, destroying layer... 
03-13 14:37:32.551  763-821/? W/AudioTrack﹕ AUDIO_OUTPUT_FLAG_FAST denied by client 
03-13 14:37:32.598 2419-2419/? I/Process﹕ Sending signal. PID: 2419 SIG: 9 
03-13 14:37:32.632  763-803/? W/InputDispatcher﹕ channel '1b803d87 appscreator.com.mydatabase/appscreator.com.mydatabase.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x9 
03-13 14:37:32.632  763-803/? E/InputDispatcher﹕ channel '1b803d87 appscreator.com.mydatabase/appscreator.com.mydatabase.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed! 
03-13 14:37:32.632  763-803/? W/InputDispatcher﹕ channel '3de688dd Toast (server)' ~ Consumer closed input channel or an error occurred. events=0x9 
03-13 14:37:32.632  763-803/? E/InputDispatcher﹕ channel '3de688dd Toast (server)' ~ Channel is unrecoverably broken and will be disposed! 
03-13 14:37:32.634  763-779/? I/ActivityManager﹕ Process appscreator.com.mydatabase (pid 2419) has died 
03-13 14:37:32.635  763-780/? I/WindowState﹕ WIN DEATH: Window{1b803d87 u0 appscreator.com.mydatabase/appscreator.com.mydatabase.MainActivity} 
03-13 14:37:32.635  763-780/? W/InputDispatcher﹕ Attempted to unregister already unregistered input channel '1b803d87 appscreator.com.mydatabase/appscreator.com.mydatabase.MainActivity (server)' 
03-13 14:37:32.644  763-1089/? I/WindowState﹕ WIN DEATH: Window{3de688dd u0 Toast} 
03-13 14:37:32.644  763-1089/? W/InputDispatcher﹕ Attempted to unregister already unregistered input channel '3de688dd Toast (server)' 
03-13 14:37:32.693  763-1931/? D/OpenGLRenderer﹕ endAllStagingAnimators on 0xa1b9e300 (RippleDrawable) with handle 0x9fa1a9f0 
03-13 14:37:32.737 1031-1031/? W/ViewRootImpl﹕ Dropping event due to no window focus: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=48247, eventTime=3117775, downTime=610179, deviceId=1, source=0x301 } 
03-13 14:37:32.738 1031-1031/? W/ViewRootImpl﹕ Dropping event due to no window focus: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=48248, eventTime=3117834, downTime=610179, deviceId=1, source=0x301 } 
03-13 14:37:32.789 1031-1031/? W/ViewRootImpl﹕ Dropping event due to no window focus: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=48249, eventTime=3117886, downTime=610179, deviceId=1, source=0x301 } 
03-13 14:37:32.924  763-780/? W/InputMethodManagerService﹕ Got RemoteException sending setActive(false) notification to pid 2419 uid 10064 
03-13 14:37:33.891  763-763/? W/NotificationService﹕ Object died trying to hide notification android.app.ITra[email protected] in package appscreator.com.mydatabase

来源

2016-03-13 Akashdeep Singh

必须在清单文件添加活动：android.content.ActivityNotFoundException：由造成无法找到明确的活动类{appscreator.com.mydatabase/appscreator.com.mydatabase.ShowData};你有没有在你的AndroidManifest.xml中声明这个活动？ –

是的，我会更新logcat –

@SofienRahmouniVirtuel我已经更新了logcat –

您需要传递View对象作为参数。写这样的方法：

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

来源

2016-03-13 18:00:39

，但是应用程序崩溃 –

@AkashdeepSingh你有没有像上面提到的那样用'View'参数更新方法？如果仍然崩溃，请更新logcat。 –

是的如何发布logcat它太大，要发表评论部分 –

-1

问题已解决。在解码字段时，我在ShowData.java中犯了一个错误。我声明了UID而不是_id。

感谢的人

来源

2016-03-13 18:58:01

Android：使用光标适配器显示来自sqlite的数据

回答

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