Android调用系统相册的方法

/**
* 打开系统相册
*/
private void openAlbum() {
Intent intent = new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
startActivityForResult(intent, 1004);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RESULT_OK) {
switch (requestCode) {
case 1004:
if (Build.VERSION.SDK_INT >= 19) {//当API大于18之后Android对图片的路径进行了封装
handleImageOfKitKat(data);
} else {
handleImageBeforeKitKat(data);
}
break;
default:
break;
}
}
super.onActivityResult(requestCode, resultCode, data);
}

/**
* API 大于等于19的时候需要对返回的数据进行解析
*
* @param data
*/

private void handleImageOfKitKat(Intent data) {
String imageUrl = null;
Uri uri = data.getData();
if (DocumentsContract.isDocumentUri(this, uri)) {
String docId = DocumentsContract.getDocumentId(uri);
if ("com.android.providers.media.documnets".equals(uri.getAuthority())) {//判断uri是不是media格式
String id = docId.split(":")[1];//是media格式的话将uri进行二次解析取出id
String selection = MediaStore.Images.Media._ID + "=" + id;
imageUrl = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);
} else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(docId));
imageUrl = getImagePath(contentUri, null);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {
imageUrl = getImagePath(uri, null);
} else if ("file".equalsIgnoreCase(uri.getScheme())) {
imageUrl = uri.getPath();
}
displayImage(imageUrl);
}

private String getImagePath(Uri externalContentUri, String selection) {
String path = null;
Cursor cursor = getContentResolver().query(externalContentUri, null, selection, null, null, null);
if (cursor == null) {
return path;
}
while (cursor.moveToNext()) {
path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
}
cursor.close();
return path;
}

/**
* API小于19的时候返回的就是图片的Url
*
* @param data
*/
private void handleImageBeforeKitKat(Intent data) {
Uri imageUrl = data.getData();
String imagePath = imageUrl.getPath();
displayImage(imagePath);
}