android下几种常用的dialog 对话框 用法与实例

java 三角形面积计算(文件读取)

文件上传

【实例简介】

【实例简介】

android 提醒小闹钟 例子源码

本例子实现了对TXT文件的读取，主要展现翻页效果的制作

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; }}

    使用SQLite缓存数据,缓存 大图片 小图片 文字 等信息

android 刮刮卡 例子源码下载

[实例简介]Open GL 入门级示例 [实例截图] [核心代码]package com.china.gltry;import javax.microedition.khronos.egl.EGL10;import javax.microedition.khronos.egl.EGL11;import javax.microedition.khronos.egl.EGLConfig;import javax.microedition.khronos.egl.EGLContext;import javax.microedition.khronos.egl.EGLDisplay;import javax.microedition.khronos.egl.EGLSurface;import javax.microedition.khronos.opengles.GL;import android.view.SurfaceHolder;/** * An EGL helper class. */public class EGLHelper{ public EGLHelper() { } /** * Initialize EGL for a given configuration spec. * @param configSpec */ public void start(int[] configSpec){ /* * Get an EGL instance */ mEgl = (EGL10) EGLContext.getEGL(); /* * Get to the default display. */ mEglDisplay = mEgl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); /* * We can now initialize EGL for that display */ int[] version = new int[2]; mEgl.eglInitialize(mEglDisplay, version); EGLConfig[] configs = new EGLConfig[1]; int[] num_config = new int[1]; mEgl.eglChooseConfig(mEglDisplay, configSpec, configs, 1, num_config); mEglConfig = configs[0]; /* * Create an OpenGL ES context. This must be done only once, an * OpenGL context is a somewhat heavy object. */ mEglContext = mEgl.eglCreateContext(mEglDisplay, mEglConfig, EGL10.EGL_NO_CONTEXT, null); mEglSurface = null; } /* * Create and return an OpenGL surface */ public GL createSurface(SurfaceHolder holder) { /* * The window size has changed, so we need to create a new * surface. */ if (mEglSurface != null) { /* * Unbind and destroy the old EGL surface, if * there is one. */ mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT); mEgl.eglDestroySurface(mEglDisplay, mEglSurface); } /* * Create an EGL surface we can render into. */ mEglSurface = mEgl.eglCreateWindowSurface(mEglDisplay, mEglConfig, holder, null); /* * Before we can issue GL commands, we need to make sure * the context is current and bound to a surface. */ mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext); GL gl = mEglContext.getGL(); return gl; } /** * Display the current render surface. * @return false if the context has been lost. */ public boolean swap() { mEgl.eglSwapBuffers(mEglDisplay, mEglSurface); /* * Always check for EGL_CONTEXT_LOST, which means the context * and all associated data were lost (For instance because * the device went to sleep). We need to sleep until we * get a new surface. */ return mEgl.eglGetError() != EGL11.EGL_CONTEXT_LOST; } public void finish() { if (mEglSurface != null) { mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT); mEgl.eglDestroySurface(mEglDisplay, mEglSurface); mEglSurface = null; } if (mEglContext != null) { mEgl.eglDestroyContext(mEglDisplay, mEglContext); mEglContext = null; } if (mEglDisplay != null) { mEgl.eglTerminate(mEglDisplay); mEglDisplay = null; } } EGL10 mEgl; EGLDisplay mEglDisplay; EGLSurface mEglSurface; EGLConfig mEglConfig; EGLContext mEglContext;}