Question

我有一个gridView，如下所示：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rl_drag_and_drop_app"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<SlidingDrawer
    android:id="@+id/bottom"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerVertical="true"
    android:orientation="horizontal"
    android:layout_marginTop="200dp"
    android:content="@+id/content"
    android:handle="@+id/handle" >

    <Button
        android:id="@+id/handle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/arrow" />

    <LinearLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent" 
        android:orientation="vertical"
        android:background="#00FF00">

            <!-- Editext for Search -->
<EditText android:id="@+id/inputSearch"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/Search_applications"
    android:inputType="textVisiblePassword"/>

<ListView
    android:id="@+id/lvApps"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"       
/>
    </LinearLayout>
</SlidingDrawer>

        <Button
        android:id="@+id/btnLinkToPersonalize"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip"
        android:background="@null"
        android:text="@string/Personalize"
        android:textColor="#21dbd4"
        android:textStyle="bold" />

<GridView 
android:id="@+id/GRIDVIEW1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dip"
android:numColumns="auto_fit"
android:columnWidth="60dp"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:gravity="center"
android:stretchMode="columnWidth"
 >  

</GridView>

 <ImageView
    android:id="@+id/trash_can"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:contentDescription="@string/trashcanDescription_Delete"
    android:padding="40dip"
    android:src="@drawable/trashcan"
    android:visibility="gone" >
</ImageView>

</RelativeLayout>

然后在我的GridView.java中设置编码：

public class GridView extends Activity {    
private int draggedIndex = -1;
private BaseAdapter adapter;
ArrayList<Integer> drawables = new ArrayList<Integer>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.drag_and_drop_app);
    Log.d("GridView", "onCreate called");
    drawables.add(R.drawable.pattern1);
    drawables.add(R.drawable.pattern2);

 android.widget.GridView gridView = (android.widget.GridView) findViewById(R.id.GRIDVIEW1);

    // Instance of Adapter Class
    gridView.setAdapter(new GridViewAdapter(this));

}

然后将适配器放在另一个类中：

package com.example.awesomefilebuilderwidget;
IMPORTS

public class GridViewAdapter extends BaseAdapter {
private Context mContextGV;

// Keep all Images in array list
public ArrayList<Integer> drawables = new ArrayList<Integer>();

// Constructor
public GridViewAdapter(Context c){
    mContextGV = c;
}

@Override
// How many items are in the data set represented by this Adapter
public int getCount() {
    return drawables.size();
}

@Override
// Get the data item associated with the specified position in the
// data set
public Object getItem(int position) {
    return drawables.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // Try to reuse the views
    ImageView view = (ImageView) convertView;
    // if convert view is null then create a new instance else reuse it
    if (view == null) {
        view = new ImageView(mContextGV);
    }

    view.setImageResource(drawables.get(position));
    view.setScaleType(ImageView.ScaleType.CENTER_CROP);
    view.setLayoutParams(new android.widget.GridView.LayoutParams(70, 70));
    view.setTag(String.valueOf(position));
    return view;
}

}

而我的Maniest就是如此：

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

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >

<receiver android:name="com.example.awesomefilebuilderwidget.AFBWidget" android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
</intent-filter>

<meta-data android:name="android.appwidget.provider"
android:resource="@xml/widget_stuff"/>

</receiver>

<activity android:name="com.example.awesomefilebuilderwidget.WidgetConfig" android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>

</intent-filter> 

</activity>   

<activity android:name="com.example.awesomefilebuilderwidget.Drag_and_Drop_App" android:label="@string/app_name" android:windowSoftInputMode="stateHidden" android:screenOrientation="portrait"></activity>
<activity android:name="com.example.awesomefilebuilderwidget.AppInfoAdapter" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Feedback" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.GridView" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.SendMessageActivity" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Utilities" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Personalize" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.SwipeDetector" android:label="@string/app_name"></activity>

</application>

</manifest>

然而，当我运行我的程序并进入Drag_and_Drop_App布局（上面显示的布局）时，gridView的onCreate永远不会被调用，因此图像永远不会出现。我已经仔细检查了一切，但却无法弄清楚它为什么没有出现。

请帮忙！

Answer 1

您必须指定一种方法来启动GridView活动。没有迹象表明你是如何开始GridView活动的。

Answer 2

如果GridView是您应用的第一个活动，则必须在清单声明中添加一个intent过滤器：

 <activity android:name="com.example.awesomefilebuilderwidget.GridView"             android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
 </activity>

不调用onCreate（）方法

2 个答案: