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我這裏有一個GridView：圖像沒有出現在GridView的
<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>
，然後有這個編碼：
package com.example.awesomefilebuilderwidget;
IMPORTS
public class Drag_and_Drop_App extends Activity {
//For GridView
private int draggedIndex = -1;
private BaseAdapter adapterGV;
ArrayList<Integer> drawables = new ArrayList<Integer>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set layout for the main screen
setContentView(R.layout.drag_and_drop_app);
// GridView
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));
// gridView.setOnItemLongClickListener(this);
與此適配器：
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;
}
}
但可繪製模式1和pattern2從來沒有出現在我的GridView中。
我確信gridView onCreate（）方法正在被調用（它是）。
我能做些什麼來解決這個問題？
新的編碼： Drag_and_Drop_App：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set layout for the main screen
setContentView(R.layout.drag_and_drop_app);
// GridView
Log.d("D&D", "onCreate called");
android.widget.GridView gridView = (android.widget.GridView) findViewById(R.id.GRIDVIEW1);
// Instance of Adapter Class
gridView.setAdapter(new GridViewAdapter(this));
// gridView.setOnItemLongClickListener(this);
我gridViewAdapter：
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;
Log.d("GridViewAdapter", "Constructor is set");
}
@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);
Log.d("GridViewAdapter", "new imageView added");
}
drawables.add(R.drawable.pattern1);
Log.d("GridViewAdapter", "pattern1 added");
drawables.add(R.drawable.pattern2);
Log.d("GridViewAdapter", "pattern2 added");
drawables.add(R.drawable.trashcan);
Log.d("GridViewAdapter", "trashcan added");
drawables.add(R.drawable.ic_launcher);
Log.d("GridViewAdapter", "ic_launcher added");
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;
}
}
你通過不會將你的drawables列表從'Drag_and_Drop_App'傳遞到你的適配器 – grexter89
好吧，那麼我應該怎樣去增加drawables呢（或者哪裏可能是更好的問題）？在適配器中？或者我應該改變我的名單？ – user2909006
如果您不需要重新使用您的適配器，我建議您在適配器中初始化您的列表。 – grexter89