2012-10-18 91 views
5

我希望在我的ListView中處理選定行的背景顏色,從閱讀中我需要使用CustomAdapter進行擴展。我的主適配器是SimpleCursorAdapter類型的,所以我修改了一個將ArrayAdapter擴展到SimpleCursorAdapter的CustomAdapter。ListView和CustomAdapter擴展SimpleCursorAdapter

我的問題是,當使用CustomAdapter時,listview是空白的,但如果不擴展並使用SimpleCursorAdapter,那麼listview就有行/項目。 Logcat在我的CustomAdapter中顯示了一個問題,如下所示。

這是我的主要活動代碼:

phrasesdb helper = new phrasesdb(this); 
database = helper.getWritableDatabase(); 
data = database.query("phrases", fields, null, null, null, null, fields[0] + " COLLATE NOCASE ASC"); 
//WORKING SimpleCursorAdapter 
//dataSource = new SimpleCursorAdapter(this, R.layout.phrases, data, fields, new int[] { R.id.phrase }); 

//NOT WORKING 
dataSource = new CustomAdapter(this, R.layout.phrases, data, fields, new int[] { R.id.phrase }); 

view = getListView(); 
setListAdapter(dataSource); 

這是自定義適配器類,我已標記的位置,其中logcat的錯誤:

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

public class CustomAdapter extends SimpleCursorAdapter { 

protected static final int NO_SELECTED_COLOR = 0xFF191919; 
protected static final int SELECTED_COLOR = 0xFF3366CC; 

Cursor items; 
private LayoutInflater mInflater; 
private int viewResourceId; 
private int selectedPosition; 


public CustomAdapter(Context context, int resourceId, Cursor data, String[] fields, int[] is) { 
    super(context, resourceId, data, fields, is); 
    mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    viewResourceId = resourceId; 
    items = data; 
} 


@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    TextView tv = (TextView)convertView; 
    if (tv == null) { 
    //WHEN DEBUGGING THIS IS WHERE LOGCAT ERROR MESSAGES STARTS 
     tv = (TextView)mInflater.inflate(viewResourceId, null); 
    } 
    tv.setText(items.getString(position)); 



    // Change the background color 
    if (position==selectedPosition) tv.setBackgroundColor(SELECTED_COLOR); 
    else tv.setBackgroundColor(NO_SELECTED_COLOR); 

    return tv; 
} 

public void setSelected(int position) { 
    selectedPosition = position; 
} 
} 

這是logcat的:

10-18 13:33:17.869:E/ListView(28378):android.widget.LinearLayout 10-18 13:33:17.869:E/List查看(28378):java.lang.ClassCastException:android.widget.LinearLayout 10-18 13:33:17.869:E/ListView(28378):at com.xxx.xxx.CustomAdapter.getView(CustomAdapter.java:49) E:/ ListView(28378):at android.widget.AbsListView.obtainView(AbsListView.java:1449) 10-18 13:33:17.869:E/ListView(28378):at android.widget.ListView.makeAndAddView(ListView.java:1801) 10-18 13:33:17.869:E/ListView(28378):at android.widget.ListView.fillSpecific(ListView.java:1339) 10-18 13/33:17.869:E/ListView(28378):在android.widget.ListView.layoutChildren(ListView.java:1637) 10-18 13:33:17.869:E/ListView(28378):在android.widget。 AbsListView.onLayout(AbsListView.java:1279) 10-18 13:33:17.869:E/ListView(28378):at android.view.View.layout(View.java:7321) 10-18 13:33:17.869:E/ListView(28378):在android.widget.FrameLayout.onLayout(FrameLayout.java:338) 10-18 13:33:17.869:E/ListView(28378):at android.view.View.layout(View.java:7321) 10-18 13:33:17.869:E/ListView(28378):android.widget.FrameLayout.onLayout(FrameLayout.java:338) 10-18 13:33:17.869:E/ListView(28378):在android.view.View.layout(View.java:7321) 10-18 13:33:17.869:E/ListView(28378):在android.view。 ViewRoot.performTraversals(ViewRoot.java:1217) 10-18 13:33:17.869:E/ListView(28378):at android.view.ViewRoot.handleMessage(ViewRoot.java:1991) 10-18 13:33: 17.869:E/ListView(28378):at android.os.Handler.dispatchMessage(Handler.java:99) 10-18 13:33:17.869:E/ListView(28378):at android.os.Looper.loop( Looper.java:150) 10-18 13:33:17.869:E/ListView(28378):at android.app.ActivityThread.main(ActivityThread.java:4385) 10-18 13:33:17.869:E/ListView(28378):at java.lang.reflect.Method.invokeNative(Native Method) 10-18 13:33:17.869:E/ListView(28378):at java.lang.reflect.Method.invoke(Method.java:507) 10- 18 13:33:17.869:E/ListView(28378):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:849) 10-18 13:33:17.869:E/ListView(28378) ):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 10-18 13:33:17.869:E/ListView(28378):at dalvik.system.NativeStart。主(本地方法)

這是logcat的是表明一些與LinearLayout中進行佈局

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout android:id="@+id/rowLayout" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal"> 
<TextView 
android:id="@+id/phrase" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_marginLeft="2dp" 
android:layout_marginRight="2dp" 
android:focusable="false" 
android:focusableInTouchMode="false" 
android:text="@string/wordforphrases" 
android:textAppearance="?android:attr/textAppearanceMedium" 
android:visibility="visible"/> 

</LinearLayout> 

,但我想不出哪裏出了問題。

請任何人都能夠在正確的方向嗎?

感謝 馬克

更新:改變以匹配膨脹按照薩爾多的想法(三江源)後:

tv = (TextView)mInflater.inflate(viewResourceId, parent); 

現在我得到這個錯誤

10-18 15:23:22.083: E/ListView(28931): addView(View, LayoutParams) is not supported in AdapterView 
10-18 15:23:22.083: E/ListView(28931): java.lang.UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView 
10-18 15:23:22.083: E/ListView(28931): at android.widget.AdapterView.addView(AdapterView.java:461) 
10-18 15:23:22.083: E/ListView(28931): at android.view.LayoutInflater.inflate(LayoutInflater.java:416) 
10-18 15:23:22.083: E/ListView(28931): at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 
10-18 15:23:22.083: E/ListView(28931): at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 
10-18 15:23:22.083: E/ListView(28931): at com.xxx.xxx.CustomAdapter.getView(CustomAdapter.java:36) 
10-18 15:23:22.083: E/ListView(28931): at android.widget.AbsListView.obtainView(AbsListView.java:1449) 
10-18 15:23:22.083: E/ListView(28931): at android.widget.ListView.makeAndAddView(ListView.java:1801) 
10-18 15:23:22.083: E/ListView(28931): at android.widget.ListView.fillSpecific(ListView.java:1339) 
10-18 15:23:22.083: E/ListView(28931): at android.widget.ListView.layoutChildren(ListView.java:1637) 
10-18 15:23:22.083: E/ListView(28931): at android.widget.AbsListView.onLayout(AbsListView.java:1279) 
10-18 15:23:22.083: E/ListView(28931): at android.view.View.layout(View.java:7321) 
10-18 15:23:22.083: E/ListView(28931): at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 
10-18 15:23:22.083: E/ListView(28931): at android.view.View.layout(View.java:7321) 
10-18 15:23:22.083: E/ListView(28931): at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 
10-18 15:23:22.083: E/ListView(28931): at android.view.View.layout(View.java:7321) 
10-18 15:23:22.083: E/ListView(28931): at android.view.ViewRoot.performTraversals(ViewRoot.java:1217) 
10-18 15:23:22.083: E/ListView(28931): at android.view.ViewRoot.handleMessage(ViewRoot.java:1991) 
10-18 15:23:22.083: E/ListView(28931): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-18 15:23:22.083: E/ListView(28931): at android.os.Looper.loop(Looper.java:150) 
10-18 15:23:22.083: E/ListView(28931): at android.app.ActivityThread.main(ActivityThread.java:4385) 
10-18 15:23:22.083: E/ListView(28931): at java.lang.reflect.Method.invokeNative(Native Method) 
10-18 15:23:22.083: E/ListView(28931): at java.lang.reflect.Method.invoke(Method.java:507) 
10-18 15:23:22.083: E/ListView(28931): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 
10-18 15:23:22.083: E/ListView(28931): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 
10-18 15:23:22.083: E/ListView(28931): at dalvik.system.NativeStart.main(Native Method) 
10-18 15:23:22.093: D/View(28931): onTouchEvent: viewFlags: 0x18244001 

當檢查父它看到TextView。

還有其他想法嗎?

回答

10

好吧,我終於得到它的工作...

這裏的問題是,如果您的自定義適配器的數據是從遊標則必須使用bindView和NewView的中擴展的SimpleCursorAdapter類而不是getView。

我會後爲別人誰可能會遇到這個問題我工作的代碼...

public class CustomAdapter extends SimpleCursorAdapter { 

private int mSelectedPosition; 
Cursor items; 
private Context context; 
private int layout; 

@Override 
public View newView(Context context, Cursor cursor, ViewGroup parent) { 

    Cursor c = getCursor(); 

    final LayoutInflater inflater = LayoutInflater.from(context); 
    View v = inflater.inflate(layout, parent, false); 

    int nameCol = c.getColumnIndex("phrase"); 
    String name = c.getString(nameCol); 

    TextView name_text = (TextView) v.findViewById(R.id.phrase); 
    if (name_text != null) { 
     name_text.setText(name); 
    } 
    return v; 
} 


public CustomAdapter(Context context, int layout, Cursor c, String[] from, int[] to) { 
    super(context, layout, c, from, to); 
    this.context = context; 
    this.layout = layout; 
} 


@Override 
public void bindView(View v, Context context, Cursor c) { 

    int nameCol = c.getColumnIndex("phrase"); 
    String name = c.getString(nameCol); 


    TextView name_text = (TextView) v.findViewById(R.id.phrase); 
    if (name_text != null) { 
     name_text.setText(name); 
    } 

    //name_text.setTextColor(Color.GREEN); 

    int position = c.getPosition(); 
    if (mSelectedPosition == position) { 
     v.setBackgroundResource(R.drawable.listviewbackground); 
     v.getBackground().setDither(true); 
    } else { 
     v.setBackgroundColor(Color.BLACK); 
    } 

} 


public void setSelectedPosition(int position) { 
    mSelectedPosition = position; 
    notifyDataSetChanged(); 

} 

而且

Cursor data; 
    static final String fields[] = { "phrase", BaseColumns._ID }; 

    dataSource = new CustomAdapter(this, R.layout.phrases, data, fields, new int[] { R.id.phrase }); 
    view = getListView(); 
    setListAdapter(dataSource); 
2

tv = (TextView)mInflater.inflate(viewResourceId,null);

+0

謝謝,更改後匹配充氣: 'code' tv =(TextView)mInflater.inflate(viewResourceId,parent); – Mark