@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout. activity_main);mLinearLayout = (LinearLayout) findViewById(R.id.mygallery);File externalDir = Environment. getExternalStorageDirectory();String photosPath = externalDir.getAbsolutePath() + "/test/";File photosFile = new File(photosPath);for (File photoFile : photosFile.listFiles()) {mLinearLayout.addView(getImageView(photoFile.getAbsolutePath()));}}private View getImageView(String absolutePath) {Bitmap bitmap = decodeBitmapFromFile(absolutePath, 200, 200);LinearLayout layout = new LinearLayout(getApplicationContext());layout.setLayoutParams( new LayoutParams(250, 250));layout.setGravity(Gravity. CENTER);ImageView imageView = new ImageView(this);imageView.setLayoutParams( new LayoutParams(200,200));imageView.setScaleType(ImageView.ScaleType. CENTER_CROP);imageView.setImageBitmap(bitmap);layout.addView(imageView);return layout;}private Bitmap decodeBitmapFromFile(String absolutePath, int reqWidth, int reqHeight) {Bitmap bm = null;// First decode with inJustDecodeBounds=true to check dimensionsfinal BitmapFactory.Options options = new BitmapFactory.Options();options. inJustDecodeBounds = true ;BitmapFactory. decodeFile(absolutePath, options);// Calculate inSampleSizeoptions. inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);// Decode bitmap with inSampleSize setoptions. inJustDecodeBounds = false ;bm = BitmapFactory. decodeFile(absolutePath, options);return bm; }private int calculateInSampleSize(Options options, int reqWidth,int reqHeight) {// Raw height and width of imagefinal int height = options.outHeight;final int width = options.outWidth;int inSampleSize = 1;if (height > reqHeight || width > reqWidth) {if (width > height) {inSampleSize = Math. round((float)height / ( float)reqHeight);  } else {inSampleSize = Math. round((float)width / ( float)reqWidth);  }  }return inSampleSize; }

        new Handler().postDelayed(new Runnable() {@Overridepublic void run() {// 水平直接滚动800px，如果想效果更平滑可以使用smoothScrollTo(int x, int y)hsv.scrollTo(800, 0);}}, 2000);