我正在编写代码以在 android 设备中实现一个小型图像库。我的代码如下。代码正在运行,但出现内存不足异常,请帮忙。我对安卓很新鲜。提前致谢。
public class GalleryActivity extends Activity{
/*
* Storage Variable
*/
private int count;
private Bitmap[] thumbnails; //Images to be displayed
private String[] arrPath; //Path of the images to be displayed
private ImageAdapter imageAdapter; //Set how the images to be displayed
Cursor imagecursor; //To move through the query
Layout grid;
/*
* Shows the Images in the form of a gallery
*/
@SuppressWarnings("deprecation")
public void showGallery() {
final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
final String orderBy = MediaStore.Images.Media._ID;
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];
GridView imagegrid = (GridView) findViewById(R.id.PhotoGrid);
imageAdapter = new ImageAdapter();
imagegrid.setAdapter(imageAdapter);
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);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent(); // To know from where the activity was called
String action = intent.getAction();
String type = intent.getType();
showGallery();
}
@Override
public void onLowMemory() {
System.gc();
System.out.println("Low Memory $$$$$$$$$$$$$$$$$$$$$$$$$$$$$");
super.onLowMemory();
}
/*
* Unregister every resource before exiting
* @see android.app.Activity#onDestroy()
*/
@Override
protected void onDestroy() {
super.onDestroy();
if(imagecursor != null){
imagecursor.close();
}
if(socket != null){
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/*
* Class : ImageAdapter
* Description : Contains functions to populate the GridView to form an image
*/
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return count;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView holder;
convertView = mInflater.inflate(
R.layout.one_image, null);
holder = (ImageView)convertView.findViewById(R.id.PhotoImage);
convertView.setTag(holder);
holder.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
int id = v.getId();
System.out.println(String.valueOf(id));
Intent intent = new Intent(GalleryActivity.this, ViewImage.class);
intent.putExtra("path", arrPath[id]);
intent.putExtra("command", "upload");
System.out.println(arrPath[id]);
startActivity(intent);
}
});
holder.setImageBitmap(thumbnails[position]);
holder.setId(position);
return convertView;
}
}// ImageAdapter
public class SimpleGestureDetector extends SimpleOnGestureListener implements OnClickListener{
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
@Override
public boolean onDoubleTap(MotionEvent e) {
return super.onDoubleTap(e);
}
@Override
public void onClick(View arg0) {
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
// right to left swipe
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
System.out.println("Left");
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
}// GalleryActivity