android volley简单使用 示例代码

android 获取已安装应用信息列表 例子 源码下载

界面均为自己绘图画出来的，可以参看学习一下绘图基本方法

android联系人带字母检索源码/** * 联系人列表适配器。 * * @author guolin */public class ContactAdapter extends ArrayAdapter { /** * 需要渲染的item布局文件 */ private int resource; /** * 字母表分组工具 */ private SectionIndexer mIndexer; public ContactAdapter(Context context, int textViewResourceId, List objects) { super(context, textViewResourceId, objects); resource = textViewResourceId; } @Override public View getView(int position, View convertView, ViewGroup parent) { Contact contact = getItem(position); LinearLayout layout = null; if (convertView == null) { layout = (LinearLayout) LayoutInflater.from(getContext()).inflate(resource, null); } else { layout = (LinearLayout) convertView; } TextView name = (TextView) layout.findViewById(R.id.name); LinearLayout sortKeyLayout = (LinearLayout) layout.findViewById(R.id.sort_key_layout); TextView sortKey = (TextView) layout.findViewById(R.id.sort_key); name.setText(contact.getName()); int section = mIndexer.getSectionForPosition(position); if (position == mIndexer.getPositionForSection(section)) { sortKey.setText(contact.getSortKey()); sortKeyLayout.setVisibility(View.VISIBLE); } else { sortKeyLayout.setVisibility(View.GONE); } return layout; } /** * 给当前适配器传入一个分组工具。 * * @param indexer */ public void setIndexer(SectionIndexer indexer) { mIndexer = indexer; }}

程序员必读之软件架构

【核心代码】 public interface CameraSource {  static final String LOG_TAG = "camera";  /**  * Open the camera source for subsequent use via calls to capture().  *   * @return true if the camera source was successfully opened.  */  boolean open();  /**  * Close the camera source. Calling close on a closed CameraSource is  * permitted but has no effect. The camera source may be reopened after  * being closed.  */  void close();  /**  * The width of the captured image.  *   * @return the width of the capture in pixels  */  int getWidth();  /**  * The height of the captured image.  *   * @return the height of the capture in pixels  */  int getHeight();  /**  * Attempts to render the current camera view onto the supplied canvas.  * The capture will be rendered into the rectangle (0,0,width,height).  * Outstanding transformations on the canvas may alter this.  *   * @param canvas the canvas to which the captured pixel data will be written  * @return true iff a frame was successfully written to the canvas  */  boolean capture(Canvas canvas);  boolean saveImage(String savePath, String fileName); }

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异步post发送请求获取json，有完整的demo，完整的jar包

调用系统拍照

android VideoView播放视频-source

android绝对布局(AbsoutLayout)入门实例，春晓秋冬 四个字依次显示，如下效果图