Android 打开相册，选择一张图片并返回

Android 打开相册，选择一张图片并返回

一 打开相册

private static final int ALBUM_OK = 0;

Intent albumIntent = new Intent(Intent.ACTION_PICK, null);
albumIntent.setDataAndType(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(albumIntent, ALBUM_OK);

二 显示图片与图片信息

打开相册使用的是

startActivityForResult(albumIntent, ALBUM_OK);

所以需要一个 onActivityResult(int requestCode, int resultCode, Intent data) 来获取返回结果：

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (ALBUM_OK == requestCode) {
Toast.makeText(this, "OK now", Toast.LENGTH_SHORT).show();
Bitmap bitmap;
Log.e("MainActivity ", " onActivityResult ");
ContentResolver cr = this.getContentResolver();
Uri uri = data.getData();

try {
bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
Log.e("MainActivity ", " onActivityResult "
+ data.getData().toString());//此处用Log.e，仅是为了查看红色Log方便
imageview.setImageBitmap(bitmap);
readExifInfo(getImagePath(uri));//这是用来读取图片的exif
} catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
}

　　

getImagePath(Uri) 用来获取图片的资源路径：

private String getImagePath(Uri uri) {
if (null == uri) {
Log.e("getImagePath", "uri return null");
return null;
}

Log.e("getImagePath", uri.toString());
String path = null;
final String scheme = uri.getScheme();
if (null == scheme) {
path = uri.getPath();
} else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
path = uri.getPath();
} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(uri, proj, null, null,
null);
int nPhotoColumn = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
if (null != cursor) {
cursor.moveToFirst();
path = cursor.getString(nPhotoColumn);
}
cursor.close();
}

return path;
}

　　

readExifInfo函数(仅给了参考，这里用log来显示exif)：

private void readExifInfo(String path) throws IOException {
ExifInterface exif = new ExifInterface(path);
String iso = exif.getAttribute(ExifInterface.TAG_ISO);
String make = exif.getAttribute(ExifInterface.TAG_MAKE);
String model = exif.getAttribute(ExifInterface.TAG_MODEL);
String flash = exif.getAttribute(ExifInterface.TAG_FLASH);
String time = exif.getAttribute(ExifInterface.TAG_DATETIME);
String wb = exif.getAttribute(ExifInterface.TAG_WHITE_BALANCE);
String aperture = exif.getAttribute(ExifInterface.TAG_APERTURE);
String width = exif.getAttribute(ExifInterface.TAG_IMAGE_WIDTH);
String height = exif.getAttribute(ExifInterface.TAG_IMAGE_LENGTH);
String focal_len = exif.getAttribute(ExifInterface.TAG_FOCAL_LENGTH);
String exposure_time = exif.getAttribute(ExifInterface.TAG_EXPOSURE_TIME);
String msg = "时间: "+ time + "\n机型: "  + model + "\n厂商: " + make
+ "\n光感: " + iso   + "\n曝光: "  + exposure_time + "\n光圈: " + aperture
+ "\n闪光: " + flash + "\n焦距: "  + focal_len+ "\n高度: " + height
+ "\n宽度: " + width + "\n白平衡: "+  wb;
Log.e("readExifInfo", msg);

AlertDialog.Builder builder = new Builder(MainActivity.this);
builder.setTitle("Exif");
builder.setMessage(msg);
builder.create().show();
}

　　

吐槽下，如果Eclipse能有VS这么爽就好了~~