我已经看过其他 SO 问题并且已经尝试了他们的解决方案，但没有帮助，所以我自己要求
我在使用“GridView”中的设备加载所有图片时遇到问题，我使用的是MediaStore＆＃39;获取图像，我非常成功，并且我已经将所有图像文件分开了
我的手机有1 GB内存，所以我可以毫无困难地加载图像， 但我面临的问题是，当我使用另一台设备时，我的手机的内存少了很多时间来加载图片，有时它只是不加载我已经尝试过的任何图像＆ ＃39;的AsyncTask＆＃39;但它没有帮助。
以下是我到目前为止所做的事情：
public class DirectoryImagesActivity extends Activity {
private ImageAdapter imageAdapter;
public static String[] arrPath;
private boolean[] thumbnailsselection;
private int ids[];
private int count;
Bundle dirBundle;
String dirName;
public static Bitmap[] imageThumb;
ArrayList<Bitmap> dirBitmap = new ArrayList<Bitmap>();
/**
* Overrides methods
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photo_gallery);
dirBundle = getIntent().getExtras();
dirName = dirBundle.getString("dir_name");
String[] projectionFolder = { MediaStore.Images.Media._ID,
MediaStore.Images.Media.BUCKET_DISPLAY_NAME,
MediaStore.Images.Media.DATA };
String selection = MediaStore.Images.Media.BUCKET_DISPLAY_NAME + " = ?";
String[] selectionArgs = new String[] { dirName };
@SuppressWarnings("deprecation")
Cursor mImageCursor = managedQuery(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projectionFolder,
selection, selectionArgs, null);
int image_column_index = mImageCursor
.getColumnIndex(MediaStore.Images.Media._ID);
this.count = mImageCursor.getCount();
arrPath = new String[this.count];
imageThumb = new Bitmap[this.count];
ids = new int[count];
this.thumbnailsselection = new boolean[this.count];
for (int i = 0; i < this.count; i++) {
mImageCursor.moveToPosition(i);
ids[i] = mImageCursor.getInt(image_column_index);
int dataColumnIndex = mImageCursor
.getColumnIndex(MediaStore.Images.Media.DATA);
arrPath[i] = mImageCursor.getString(dataColumnIndex);
int id = mImageCursor.getInt(mImageCursor
.getColumnIndex(MediaStore.MediaColumns._ID));
dirBitmap.add(MediaStore.Images.Thumbnails.getThumbnail(
getContentResolver(), id,
MediaStore.Images.Thumbnails.MICRO_KIND, null));
}
GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imageAdapter = new ImageAdapter(this);
imagegrid.setAdapter(imageAdapter);
// imagecursor.close();
final Button selectBtn = (Button) findViewById(R.id.selectBtn);
selectBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
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 {
Log.d("SelectedImages", selectImages);
Intent i = new Intent();
i.putExtra("data", selectImages);
setResult(Activity.RESULT_OK, i);
finish();
}
}
});
}
@Override
public void onBackPressed() {
setResult(Activity.RESULT_CANCELED);
super.onBackPressed();
}
/**
* Class method
*/
/**
* This method used to set bitmap.
*
* @param iv
* represented ImageView
* @param id
* represented id
*/
public void setBitmap(final ImageView iv, final Bitmap id) {
new AsyncTask<Void, Void, Bitmap>() {
@Override
protected Bitmap doInBackground(Void... params) {
return id;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
iv.setImageBitmap(result);
}
}.execute();
}
/**
* List adapter
*
* @author tasol
*/
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageLoader imageLoader;
Context context;
public ImageAdapter(Context context) {
this.context = context;
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader = new ImageLoader(context);
}
public int getCount() {
return dirBitmap.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.layout_improved_grid,
null);
holder.imageview = (SquareImageView) convertView
.findViewById(R.id.thumbImage);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.imageview.setId(position);
// holder.imageview.setImageBitmap(imageThumb[position]);
holder.imageview.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(DirectoryImagesActivity.this,
"Item Clicked", Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(),
FullImageActivity.class); // passing array index
i.putExtra("id", position);
startActivity(i);
}
});
try {
setBitmap(holder.imageview, dirBitmap.get(position));
} catch (Throwable e) {
}
holder.id = position;
return convertView;
}
}
/**
* Inner class
*
* @author tasol
*/
class ViewHolder {
SquareImageView imageview;
int id;
}
public static Bitmap convertBitmap(String path) {
Bitmap bitmap = null;
BitmapFactory.Options bfOptions = new BitmapFactory.Options();
bfOptions.inDither = false; // Disable Dithering mode
bfOptions.inPurgeable = true; // Tell to gc that whether it needs free
// memory, the Bitmap can be cleared
bfOptions.inInputShareable = true; // Which kind of reference will be
// used to recover the Bitmap data
// after being clear, when it will
// be used in the future
bfOptions.inTempStorage = new byte[32 * 1024];
File file = new File(path);
FileInputStream fs = null;
try {
fs = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
if (fs != null) {
bitmap = BitmapFactory.decodeFileDescriptor(fs.getFD(), null,
bfOptions);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fs != null) {
try {
fs.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return bitmap;
}
}
如果有人可以帮我提前谢谢你
答案 0 :(得分：0)
由于您要加载的图片很多，因此必须按顺序实施延迟加载，以提高其他内存设备的应用性能。 您可以参考此库https://github.com/nostra13/Android-Universal-Image-Loader。 我希望这会有所帮助。
答案 1 :(得分：0)
试试这是有效的解决方案
<强> 1）PhotoGalaryActivity.java
public class PhotoGalaryActivity extends Activity {
private ImageAdapter imageAdapter;
private String[] arrPath;
private boolean[] thumbnailsselection;
private int ids[];
private int count;
/**
* Overrides methods
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photo_gallery);
final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
final String orderBy = MediaStore.Images.Media._ID;
@SuppressWarnings("deprecation")
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.arrPath = new String[this.count];
ids = new int[count];
this.thumbnailsselection = new boolean[this.count];
for (int i = 0; i < this.count; i++) {
imagecursor.moveToPosition(i);
ids[i] = imagecursor.getInt(image_column_index);
int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
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) {
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 {
Log.d("SelectedImages", selectImages);
Intent i = new Intent();
i.putExtra("data", selectImages);
setResult(Activity.RESULT_OK, i);
finish();
}
}
});
}
@Override
public void onBackPressed() {
setResult(Activity.RESULT_CANCELED);
super.onBackPressed();
}
/**
* Class method
*/
/**
* This method used to set bitmap.
* @param iv represented ImageView
* @param id represented id
*/
private void setBitmap(final ImageView iv, final int id) {
new AsyncTask<Void, Void, Bitmap>() {
@Override
protected Bitmap doInBackground(Void... params) {
return MediaStore.Images.Thumbnails.getThumbnail(getApplicationContext().getContentResolver(), id, MediaStore.Images.Thumbnails.MICRO_KIND, null);
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
iv.setImageBitmap(result);
}
}.execute();
}
/**
* List adapter
* @author tasol
*/
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) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.photo_gallery_item, 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) {
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) {
int id = holder.checkBox.getId();
if (thumbnailsselection[id]) {
holder.checkBox.setChecked(false);
thumbnailsselection[id] = false;
} else {
holder.checkBox.setChecked(true);
thumbnailsselection[id] = true;
}
}
});
try {
setBitmap(holder.imageview, ids[position]);
} catch (Throwable e) {
}
holder.checkBox.setChecked(thumbnailsselection[position]);
holder.id = position;
return convertView;
}
}
/**
* Inner class
* @author tasol
*/
class ViewHolder {
ImageView imageview;
CheckBox checkBox;
int id;
}
}
<强> 2）photo_gallery.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView android:id="@+id/thumbImage" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_centerInParent="true"
/>
<CheckBox android:id="@+id/itemCheckBox" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_alignParentRight="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
第3）photo_gallery_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView android:id="@+id/thumbImage" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_centerInParent="true"
/>
<CheckBox android:id="@+id/itemCheckBox" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_alignParentRight="true"
android:layout_alignParentTop="true" />
</RelativeLayout>