Android中HorizontalScrollView使用方法详解

 @Override 
 protected 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 dimensions 
  final BitmapFactory.Options optiOns= new BitmapFactory.Options(); 
  options. inJustDecodeBounds = true ; 
  BitmapFactory. decodeFile(absolutePath, options); 
  
  // Calculate inSampleSize 
  options. inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); 
  
  // Decode bitmap with inSampleSize set 
  options. inJustDecodeBounds = false ; 
  bm = BitmapFactory. decodeFile(absolutePath, options); 
  
  return bm; 
} 
 
 private int calculateInSampleSize(Options options, int reqWidth, 
    int reqHeight) { 
  // Raw height and width of image 
  final 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() { 
 @Override 
 public 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);