首先確定正確的Intent就成功了一半，很多時候我們只看到了Intent.ACTION_GET_CONTENT，但使用就不會直接開啟相簿，而且選中後無法返回圖片路徑，下面才是圖片庫的正確開啟方式

Intent openAlbumIntent = new Intent(

Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

private static final int PHOTOZOOM = 2;

Intent openAlbumIntent = new Intent(
Intent.ACTION_PICK
 
, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
openAlbumIntent.setType("image/*");
openAlbumIntent.putExtra("crop", true);
openAlbumIntent.putExtra("return-data", true);
startActivityForResult(openAlbumIntent, PHOTOZOOM);

@Override
public void onActivityResult(int requestCode, int 
 
resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode != RESULT_OK) {
            return;
}

            switch (requestCode){                case PHOTOZOOM://相簿
if (data==null) {
                        return;
}               picPath = selectImage
 
(getApplicationContext(),data);mHead_imgv.setImageBitmap(nativeBitmap(picPath));                    break;
                default:
                    break;
}
        }

然後在下方法裡返回圖片路徑

public static String selectImage(Context context, Intent data){
    Uri selectedImage = data.getData();
    if(selectedImage!=null){
        String uriStr=selectedImage.toString();
String path=uriStr.substring(10,uriStr.length());
        if(path.startsWith("com.sec.android.gallery3d")){
                       return null;
}
    }
    String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(selectedImage,filePathColumn, null, null, null);
cursor.moveToFirst();
    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
    return picturePath;

轉化為bitmap設定，opts的值越大，圖片質量越差，但能有效防止圖片過大造成記憶體溢位的異常

public static Bitmap nativeBitmap(String imagepath){
    BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inSampleSize = 4;
Bitmap bit = BitmapFactory.decodeFile(imagepath,opts);
    return bit;
}