列表视图和适配器的绑定
列表视图既可以使用ListView组件,也可以继承ListActivity。显示可以是ArrayAdapter,也可以是游标SimpleCursorAdapter,还可以是继承BaseAdapter展示其它视图。
Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, null); //获得通讯录联系人游标对象Cursor startManagingCursor(c); //实例化列表适配器 ListAdapter adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, c, new String[] {People.NAME} , new int[] {android.R.id.text1}); setListAdapter(adapter);
14.网格视图(GridView)
网格视图配合BaseAdapter示例,图片缩略图网格显示
public class MainActivity extends Activity { private GridView gv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); gv = (GridView)findViewById(R.id.GridView01); gv.setNumColumns(4); // gv.setNumColumns(3); // String[] strs = {"a","a1","a2","b","b1","b2","c","c1","c2"}; // ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_gallery_item,strs); gv.setAdapter(new MyAdapter(this)); } class MyAdapter extends BaseAdapter{ private Integer[] imgs = { R.drawable.gallery_photo_1, R.drawable.gallery_photo_2, R.drawable.gallery_photo_3, R.drawable.gallery_photo_4, R.drawable.gallery_photo_5, R.drawable.gallery_photo_6, R.drawable.gallery_photo_7, R.drawable.gallery_photo_8, R.drawable.gallery_photo_1, R.drawable.gallery_photo_2, R.drawable.gallery_photo_3, R.drawable.gallery_photo_4, R.drawable.gallery_photo_5, R.drawable.gallery_photo_6, R.drawable.gallery_photo_7, R.drawable.gallery_photo_8 }; Context context; MyAdapter(Context context){ this.context = context; } public int getCount() { return imgs.length; } public Object getItem(int item) { return item; } public long getItemId(int id) { return id; } public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { imageView = new ImageView(context); imageView.setLayoutParams(new GridView.LayoutParams(45, 45)); imageView.setAdjustViewBounds(false); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(8, 8, 8, 8); } else { imageView = (ImageView) convertView; } imageView.setImageResource(imgs[position]); return imageView; } } }
15.画廊视图
画廊视图和BaseAdapter配合,底部显示图片缩略图上面显示放大图片
public class MainActivity extends Activity implements OnItemSelectedListener, ViewFactory { private ImageSwitcher mSwitcher; private Integer[] mThumbIds = { R.drawable.sample_thumb_0, R.drawable.sample_thumb_1, R.drawable.sample_thumb_2, R.drawable.sample_thumb_3, R.drawable.sample_thumb_4, R.drawable.sample_thumb_5, R.drawable.sample_thumb_6, R.drawable.sample_thumb_7 }; private Integer[] mImageIds = { R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7 }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); mSwitcher = (ImageSwitcher) findViewById(R.id.switcher); mSwitcher.setFactory(this); mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); Gallery g = (Gallery) findViewById(R.id.gallery); g.setAdapter(new ImageAdapter(this)); g.setOnItemSelectedListener(this); } public class ImageAdapter extends BaseAdapter { public ImageAdapter(Context c) { mContext = c; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView i = new ImageView(mContext); i.setImageResource(mThumbIds[position]); i.setAdjustViewBounds(true); i.setLayoutParams(new Gallery.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); i.setBackgroundResource(R.drawable.picture_frame); return i; } private Context mContext; } @Override public void onItemSelected(AdapterView<?> adapter, View v, int position, long id) { mSwitcher.setImageResource(mImageIds[position]); } @Override public void onNothingSelected(AdapterView<?> arg0) { } @Override public View makeView() { ImageView i = new ImageView(this); i.setBackgroundColor(0xFF000000); i.setScaleType(ImageView.ScaleType.FIT_CENTER); i.setLayoutParams(new ImageSwitcher.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); return i; } }
时间: 2024-11-10 07:41:20