我按照本教程http://vikaskanani.wordpress.com/2011/07/20/android-custom-image-gallery-with-checkbox-in-grid-to-select-multiple/ 下面是我的代码，从应用程序内部存储器加载图像和显示使用简单的适配器，但现在我想要广告复选框我发现这个教程哪个llad图像来自我想自定义这个示例代码从文件位置加载图像我该怎么做更改此代码以从文件位置加载图像或如何自定义其适配器以加载我的文件我该怎么做帮助plz
<!-----------------this is my code------>
GridView gridView;
SimpleAdapter simpleAdapter;
gridView =(GridView)findViewById(R.id.grid);
gridView.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View view, int
position,long id) {
if(currentFiles[position].isDirectory())
{
root = new File("/data/data/com.myexample/files
/"+FileName(currentFilePath[position])+"/");
Log.e("Root first",root+ " ");
currentFiles = root.listFiles();
inflateListView(currentFiles);
}
else if(currentFiles[position].isFile())
{
inflateListView(currentFiles);
} } });
private void inflateListView(File[] files){
List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();
for(int i=0;i<files.length;i++)
{
Map<String, Object> listItem = new HashMap<String, Object>();
if(files[i].isDirectory())
{
listItem.put("icon", R.drawable.folder);
}
else
{
listItem.put("icon", files[i]);
}
listItem.put("fileName", files[i].getName());
listItems.add(listItem);
}
simpleAdapter=new SimpleAdapter(this,listItems,R.layout.line,new String[]
{"icon","fileName"},new int[]{R.id.icon,R.id.file_name});
gridView.setAdapter(simpleAdapter);
<!--------this is sample code which load images from Gallery--------->>>>>>
import android.widget.CheckBox;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
public class AndroidCustomGalleryActivity extends Activity {
private int count;
private Bitmap[] thumbnails;
private boolean[] thumbnailsselection;
private String[] arrPath;
private ImageAdapter imageAdapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String[] columns = { MediaStore.Images.Media.DATA,
MediaStore.Images.Media._ID };
final String orderBy = MediaStore.Images.Media._ID;
Cursor imagecursor = managedQuery(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns,
null,
null, orderBy);
int image_column_index =
imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
this.count = imagecursor.getCount();
this.thumbnails = new Bitmap[this.count];
this.arrPath = new String[this.count];
this.thumbnailsselection = new boolean[this.count];
for (int i = 0; i < this.count; i++) {
imagecursor.moveToPosition(i);
int id = imagecursor.getInt(image_column_index);
int dataColumnIndex =
imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(
getApplicationContext().getContentResolver(), id,
MediaStore.Images.Thumbnails.MICRO_KIND, null);
arrPath[i]= imagecursor.getString(dataColumnIndex);
}
GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imageAdapter = new ImageAdapter();
imagegrid.setAdapter(imageAdapter);
imagecursor.close();
final Button selectBtn = (Button) findViewById(R.id.selectBtn);
selectBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
final int len = thumbnailsselection.length;
int cnt = 0;
String selectImages = "";
for (int i =0; i<len; i++)
{
if (thumbnailsselection[i]){
cnt++;
selectImages = selectImages + arrPath[i] +
"|";
}
}
if (cnt == 0){
Toast.makeText(getApplicationContext(),
"Please select at least one image",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),
"You've selected Total " + cnt +
"
image(s).",
Toast.LENGTH_LONG).show();
Log.d("SelectedImages", selectImages);
}
}
});
}
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater)
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return count;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(
R.layout.galleryitem, null);
holder.imageview = (ImageView)
convertView.findViewById(R.id.thumbImage);
holder.checkbox = (CheckBox)
convertView.findViewById(R.id.itemCheckBox);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.checkbox.setId(position);
holder.imageview.setId(position);
holder.checkbox.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
CheckBox cb = (CheckBox) v;
int id = cb.getId();
if (thumbnailsselection[id]){
cb.setChecked(false);
thumbnailsselection[id] = false;
} else {
cb.setChecked(true);
thumbnailsselection[id] = true;
}
}
});
holder.imageview.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
int id = v.getId();
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" +
arrPath[id]), "image/*");
startActivity(intent);
}
});
holder.imageview.setImageBitmap(thumbnails[position]);
holder.checkbox.setChecked(thumbnailsselection[position]);
holder.id = position;
return convertView;
}
}
class ViewHolder {
ImageView imageview;
CheckBox checkbox;
int id;
}
}
答案 0 :(得分：0)
一般来说，您应该创建一些图像文件集合，而不是使用BitmapFactory来加载它们：
public static Bitmap getBitmapFromFile(File bitmapFile, int sideSizeLimit){
if (bitmapFile==null || !bitmapFile.exists() || !bitmapFile.canRead())
return null;
int maxWidth = 0, maxHeight = 0;
if (sideSizeLimit>0){
maxWidth = sideSizeLimit;
maxHeight = sideSizeLimit;
}
try {
//decode image size
BitmapFactory.Options bmfOtions = new BitmapFactory.Options();
bmfOtions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(bitmapFile),null,bmfOtions);
//Find the correct scale value. It should be the power of 2.
//final int REQUIRED_SIZE=70;
int width_tmp=bmfOtions.outWidth, height_tmp=bmfOtions.outHeight;
int scale=1;
while(width_tmp > maxWidth || height_tmp > maxHeight){
width_tmp/=2;
height_tmp/=2;
scale++;
}
bmfOtions.inSampleSize = scale;
bmfOtions.inJustDecodeBounds = false;
//decode with inSampleSize
//BitmapFactory.Options o2 = new BitmapFactory.Options();
return BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bmfOtions);
} catch (FileNotFoundException e) {}
return null;
}
你也应该阅读http://developer.android.com/training/displaying-bitmaps/index.html 啊，我找到了一些例子（收集文件）：
public static boolean clearImagesCache(){
// depends on isExternalStorageAvailable()
final File cacheDir= getCacheDir(); //new File(Environment.getExternalStorageDirectory() + SD_CACHE_PATH);
if( !cacheDir.exists() )
return false;
final File[] files = cacheDir.listFiles();
File file2delete;
for(int i=0; i<files.length; i++) {
file2delete = files[i];
if(!file2delete.isDirectory() && file2delete.canWrite())
file2delete.delete();
}
return true;
}
然而，此代码会删除给定目录中的所有文件，但您必须将它们收集到某个集合中。