摘要： 1、检测是否有摄像头 /** Check if this device has a camera */private boolean checkCameraHardware(Context context) { if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ // this device has a camera return true; } else { // no camera on this device ... 阅读全文

摘要： Level Listgoogle 说明：A Drawable that manages a number of alternate Drawables, each assigned a maximum numerical value. Setting the level value of the drawable with setLevel() loads the drawable resource in the level list that has a android:maxLevel value greater than or equal to the value passed to t 阅读全文

摘要： Android中drawable分为Bitmap File、Nine-Patch File、Layer List、State List、Level List、Transition Drawable、Inset Drawable、Clip Drawable、Scale Drawable、Shape Drawable等10余种类型，其中最常用的当属Bitmap File和Nine-Patch File，这两种也是我目前比较熟悉也比较简单的类型，这里暂不单独列举。下面将从Layer List开始，一种一种类型去采用实例的方式进行深度分析。Layer ListA LayerDrawable is a 阅读全文