Comment puis-je ajouter dynamiquement des images à un GridView?

J'ai un GridView qui est créé sur la base d'un tableau d'éléments. J'ai besoin d'ajouter plus d'images que vous faites défiler la grille vers le bas, mais je ne suis pas sûr de la façon de le faire.

Maintenant, je ne comprends ce qui suit:

1. J'ai un adaptateur qui parcourt le tableau et fournit ImageIds de la classe qui sera de retour le ImageViews
2. De toute façon je dois modifier ce tableau et de laisser l'adaptateur de savoir à ce sujet, donc ma question est, comment puis-je obtenir une référence à cet adaptateur?

C'est mon code:

package com.wm.grid;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.Toast;
public class GridActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Integer[] mThumbIds12 = {
R.drawable.sample_2, R.drawable.sample_3,R.drawable.s1,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7,
R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7,
R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7
};
final Integer[] mThumbIds1 = { 
R.drawable.sample_2, R.drawable.sample_3,R.drawable.s1,
R.drawable.sample_2, R.drawable.sample_3,R.drawable.s1,
R.drawable.sample_2, R.drawable.sample_3,R.drawable.s1,
R.drawable.sample_2, R.drawable.sample_3,R.drawable.s1,
};
final GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this,mThumbIds12));
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Toast.makeText(GridActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
gridview.setOnScrollListener(new OnScrollListener() {
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case OnScrollListener.SCROLL_STATE_IDLE:
//List is idle
break;
case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
//Toast.makeText(GridActivity.this, "X", Toast.LENGTH_SHORT).show();
break;
case OnScrollListener.SCROLL_STATE_FLING:
//Toast.makeText(GridActivity.this, "Z", Toast.LENGTH_SHORT).show();
break;
}   
}
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if(firstVisibleItem + visibleItemCount == totalItemCount){
Toast.makeText(GridActivity.this, "BOTTOM", Toast.LENGTH_SHORT).show();
}
//Toast.makeText(GridActivity.this, "TOP", Toast.LENGTH_SHORT).show();  
}
});
}
}

Maintenant, il ya certains code redondant, mais c'est mon projet de tests. Tout ce que je sais, c'est que la mise à jour de la carte a arriver quand firstVisibleItem + visibleItemCount == totalItemCount (c'est à dire lorsque la GridView a atteint le fond).

C'est mon ImageAdapter (basé sur Android dev site)

package com.wm.grid;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import com.wm.grid.R;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private Integer[] mThumbIds;
public ImageAdapter(Context c,Integer[] m) {
mContext = c;
mThumbIds = m;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
//create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {  //if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(150, 150));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
public Integer[] AddItems(Integer[] a){
final Integer[] aThumbIds;
final int i;
aThumbIds = a;
Integer[] a2 = new Integer[mThumbIds.length + aThumbIds.length];
System.arraycopy(mThumbIds, 0, a2, 0, mThumbIds.length);
System.arraycopy(aThumbIds, 0, a2, mThumbIds.length, aThumbIds.length);
return mThumbIds;
}
}

image.xml

<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/grid_item_image"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@drawable/s1"
>
</ImageView>

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/layout1"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1">
<TextView
android:id="@+id/tv1"
android:layout_width="fill_parent"
android:layout_height="40pt"
android:text="row three"
android:textSize="15pt" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<GridView  
android:id="@+id/gridview"
android:layout_width="fill_parent" 
android:layout_height="fill_parent"
android:columnWidth="150dp"
android:numColumns="auto_fit"
android:verticalSpacing="2dp"
android:horizontalSpacing="2dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>
</LinearLayout>
</LinearLayout>

Comment dois-je aborder cette?

OriginalL'auteur user1036005 | 2011-11-08