获取图片和视频数据源
public static class ImageTaskLoader implements LoaderManager.LoaderCallbacks<Cursor> {
private Context mContext;
private ImageLoaderCallbacks mImageLoaderCallbacks;
public ImageTaskLoader(Context mContext, ImageLoaderCallbacks mImageLoaderCallbacks) {
this.mContext = mContext;
this.mImageLoaderCallbacks = mImageLoaderCallbacks;
}
private final String[] IMAGE_PROJECTION = {
MediaStore.Images.Media.DATA,
MediaStore.Images.Media.DISPLAY_NAME,
MediaStore.Images.Media.DATE_ADDED,
MediaStore.Images.Media.MIME_TYPE,
MediaStore.Images.Media.SIZE,
MediaStore.Images.Media._ID};
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
CursorLoader cursorLoader = null;
cursorLoader = new CursorLoader(mContext,
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_PROJECTION,
IMAGE_PROJECTION[4] + ">0 AND " + IMAGE_PROJECTION[3] + "=? OR " + IMAGE_PROJECTION[3] + "=? ",
new String[]{"image/jpeg", "image/png"}, IMAGE_PROJECTION[2] + " DESC");
return cursorLoader;
}
private boolean fileExist(String path) {
if (!TextUtils.isEmpty(path)) {
return new File(path).exists();
}
return false;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
List<Image> images = new ArrayList<>();
if (data != null) {
if (data.getCount() > 0) {
data.moveToFirst();
do {
String path = data.getString(data.getColumnIndexOrThrow(IMAGE_PROJECTION[0]));
String name = data.getString(data.getColumnIndexOrThrow(IMAGE_PROJECTION[1]));
long dateTime = data.getLong(data.getColumnIndexOrThrow(IMAGE_PROJECTION[2]));
if (!fileExist(path)) {
continue;
}
Image image = null;
if (!TextUtils.isEmpty(name)) {
image = new Image(path, name, dateTime);
images.add(image);
}
} while (data.moveToNext());
}
}
if (mImageLoaderCallbacks != null) {
mImageLoaderCallbacks.onLoadFinished(images);
}
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
}
public static class VideoTaskLoader implements LoaderManager.LoaderCallbacks<Cursor> {
private Context mContext;
private VideoLoaderCallbacks mVideoLoaderCallbacks;
public VideoTaskLoader(Context mContext, VideoLoaderCallbacks mVideoLoaderCallbacks) {
this.mContext = mContext;
this.mVideoLoaderCallbacks = mVideoLoaderCallbacks;
}
private final String[] VIDEO_PROJECTION = {
MediaStore.Video.Media.DATA,
MediaStore.Video.Media.DISPLAY_NAME,
MediaStore.Video.Media.DATE_ADDED,
MediaStore.Video.Media.MIME_TYPE,
MediaStore.Video.Media.SIZE,
MediaStore.Video.Media._ID,
MediaStore.Video.VideoColumns.DURATION
};
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
CursorLoader cursorLoader = null;
cursorLoader = new CursorLoader(mContext,
MediaStore.Video.Media.EXTERNAL_CONTENT_URI, VIDEO_PROJECTION,
VIDEO_PROJECTION[4] + ">0 ", null, VIDEO_PROJECTION[2] + " DESC");
return cursorLoader;
}
private boolean fileExist(String path) {
if (!TextUtils.isEmpty(path)) {
return new File(path).exists();
}
return false;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
List<Video> videos = new ArrayList<>();
if (data != null) {
if (data.getCount() > 0) {
data.moveToFirst();
do {
String path = data.getString(data.getColumnIndexOrThrow(VIDEO_PROJECTION[0]));
String name = data.getString(data.getColumnIndexOrThrow(VIDEO_PROJECTION[1]));
long dateTime = data.getLong(data.getColumnIndexOrThrow(VIDEO_PROJECTION[2]));
long size = data.getLong(data.getColumnIndexOrThrow(VIDEO_PROJECTION[4]));
long duration_ms = data.getLong(data.getColumnIndexOrThrow(VIDEO_PROJECTION[6]));
if (!fileExist(path)) {
continue;
}
Video video = null;
if (!TextUtils.isEmpty(name)) {
video = new Video(path, name, dateTime, size, duration_ms);
videos.add(video);
}
} while (data.moveToNext());
}
}
if (mVideoLoaderCallbacks != null) {
mVideoLoaderCallbacks.onLoadFinished(videos);
}
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
}
ImageLoader显示缩率图
_displayImageOptions = new DisplayImageOptions.Builder().showImageForEmptyUri(R.drawable.no_hotelpic)
.showImageOnLoading(R.drawable.no_hotelpic)
.imageScaleType(ImageScaleType.EXACTLY_STRETCHED)//有效降低内存，减少oom
.cacheInMemory(true).cacheOnDisk(true)
.considerExifParams(true)//考虑旋转因素
.build();
图片的缩放方式
imageScaleType(ImageScaleType imageScaleType)
imageScaleType:
EXACTLY :图像将完全按比例缩小的目标大小
EXACTLY_STRETCHED:图片会缩放到目标大小完全
IN_SAMPLE_INT:图像将被二次采样的整数倍
IN_SAMPLE_POWER_OF_2:图片将降低2倍，直到下一减少步骤，使图像更小的目标大小
NONE:图片不会调整
选择器中的方形图片，宽撑满，自定义ImageView
public class SquaredImageView extends ImageView {
public SquaredImageView(Context context) {
super(context);
}
public SquaredImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth());
}
}
获取图片角度
private int getImageSpinAngle(String path) {
int degree = 0;
ExifInterface exifInterface = null;
try {
exifInterface = new ExifInterface(path);
} catch (IOException e) {
// 图片不支持获取角度
return 0;
}
int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
degree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
degree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
degree = 270;
break;
}
return degree;
}
图片旋转角度
private static Bitmap rotatingImage(int angle, Bitmap bitmap) {
//rotate image
Matrix matrix = new Matrix();
matrix.postRotate(angle);
//create a new image
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix,
true);
}