Android常用代码大全

【实例简介】

应用背景自动识别所有的串口，多串口收发。包含JNI。关键技术Android访问低层文件 Android串口数据收发

实现了登陆，注册，添加删除员工信息 public class MainActivity extends Activity { private EditText etName; private EditText etSalary; private EditText etAge; private RadioGroup radioGroup; private Handler handler=new Handler(){ public void handleMessage(android.os.Message msg) { switch (msg.what) { case HANDLER_ADD_EMP_SUCCESS: Toast.makeText(MainActivity.this, "恭喜，添加成功", Toast.LENGTH_SHORT).show(); //启动ListEmpActivity finish(); break; case HANDLER_ADD_EMP_FAIL: Toast.makeText(MainActivity.this, "恭喜，添加失败:"+msg.obj, Toast.LENGTH_SHORT).show(); break; } } }; public static final int HANDLER_ADD_EMP_SUCCESS=0; public static final int HANDLER_ADD_EMP_FAIL=1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setViews();

资源描述此项目是安卓系统下的文件管理器，主要适用于智能电视。

实现简易微博功能的安卓app，可以发送心情到公众平台并在网页上可以显示读取。(an android app, functioned pretty like weibo,we can twitter in a public platform and read other people s weibo.)

各种android app操作的统计，支持fragment 

安卓课程表，用listview实现

在surfaceView绘图程序中，必须另外建立一个thread来连续调用我们的draw方法。但是3D绘图程序是由系统自动连续运行我们建立的onDrawFrame（）方法，因此不需要自己建立thread运行绘图工作。3D绘图程序必须换成使用GLSurfaceView类，并且实现GLSurfaceView.Renderer界面。

[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;}

Canvas手写签名，保存图片 Canvas手写签名，保存图片Canvas手写签名，保存图片Canvas手写签名，保存图片Canvas手写签名，保存图片