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? ? ?Gallery在滑動(dòng)的時(shí)候有一個(gè)脫手時(shí)候的速度，這個(gè)速度將會(huì)影響Gallery滑動(dòng)的慣性，有時(shí)候我們需要對(duì)這個(gè)慣性進(jìn)行處理，這個(gè)時(shí)候我們就得自己定義View了，自定義個(gè)Gallery繼承Gallery，并且重寫onFling()方法，如下：

public class GalleryDemo extends Gallery {public GalleryDemo(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {// TODO Auto-generated method stubreturn super.onFling(e1, e2, velocityX / 4, velocityY);}}

值得注意的是自己定義控件的時(shí)候得使用 public GalleryDemo(Context context, AttributeSet attrs)構(gòu)造方法，要不則會(huì)出現(xiàn)莫名其妙的異常。

下面就是去使用這個(gè)自定義的Gallery了：

public class GalleryDemoActivity extends Activity {private Gallery gl_main;private GalleryAdapter adapter;private int[] pics = new int[] { R.drawable.a1, R.drawable.a2, R.drawable.a3, R.drawable.a4, R.drawable.a5,R.drawable.a6, R.drawable.a7, R.drawable.a8, R.drawable.a9, R.drawable.a10 };/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);gl_main = (Gallery) findViewById(R.id.gl_main);adapter = new GalleryAdapter();//gl_main.gl_main.setAdapter(adapter);}private class GalleryAdapter extends BaseAdapter {@Overridepublic int getCount() {// TODO Auto-generated method stubreturn pics.length;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn null;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubImageView iv = new ImageView(GalleryDemoActivity.this);iv.setLayoutParams(new Gallery.LayoutParams(160, 320));iv.setImageResource(pics[position]);return iv;}} }

轉(zhuǎn)載于:https://my.oschina.net/keeponmoving/blog/64069

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