我想开发一个可以选择多个图像并将它们保存在 sdcard 文件夹中的 android 应用程序。我可以选择多个文件，但是当我想将它们保存在 sdcard 文件夹中时，只有图像名称。当我尝试使用 GridView 显示这些图像时，我已经理解了，没有图像。这是我的代码......
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.image_selection);
Bundle b=getIntent().getExtras();
directoryName=b.getString("key");
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] + "|";
String sendString=extractString(arrPath[i]);
saveImageToSdCard(sendString,arrPath[i]);
Toast.makeText(getApplicationContext(),
sendString,
Toast.LENGTH_LONG).show();
}
}
}
});
}
public String extractString(String myString)
{
String finalString="";
int index = 0;
int count=0;
char newCharacter[]=new char[50];
char[] charArray = myString.toCharArray();
int length=myString.length();
for (int i = 0; i < length; i++)
{
char charString=charArray[i];
if(charString=='/')
{
index=i;
}
}
for (int i = index+1; i < length; i++)
{
newCharacter[count]=charArray[i];
count++;
}
finalString=String.valueOf(newCharacter);
return finalString;
}
public void saveImageToSdCard(String imageName, String fullPath)
{
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root +"/"+directoryName);
String fname = imageName;
final File file = new File (myDir, fname);
if (file.exists ())file.delete();
try
{
final Bitmap myBitmap=BitmapFactory.decodeFile(fullPath);
new Thread() {
public void run()
{
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
if (myBitmap != null)
{
myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
}
try {
if (file.createNewFile()) {
//
} else {
//
}
FileOutputStream fo;
fo = new FileOutputStream(file);
fo.write(bytes.toByteArray());
fo.flush();
fo.close();
// result.recycle();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
FileOutputStream stream=new FileOutputStream(file);
myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, stream);
stream.flush();
stream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
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;
}
我该如何解决这个问题。谢谢...