Andrid 打印调用堆栈

    public static void printCallStatck() {
        Throwable ex = new Throwable();
        StackTraceElement[] stackElements = ex.getStackTrace();
        if (stackElements != null) {
            Log.e("Chw","printCallStatck+++++++++++++++++++++++");
            for (int i = 0; i < stackElements.length; i++) {
                Log.e("Chw",stackElements[i].getClassName()+"."+stackElements[i].getMethodName()+"-"+stackElements[i].getLineNumber());
            }
            Log.e("Chw","printCallStatck----end+++++++++++++++++++++++");
        }
    }

判断是否连接互联网

/**
 *  判断是否有外网连接（普通方法不能判断外网的网络是否连接，比如连接上局域网）
 * @return
 */
public static boolean ping(){
    boolean result=false;
    try {
        String ip ="www.baidu.com";// ping 的地址，可以换成任何一种可靠的外网
        Process process=Runtime.getRuntime().exec("ping -c 2 -w 100 "+ip);//ping 网址3次
        int status= process.waitFor();
        if(status==0){
            result= true;
        }
    } catch (IOException e) {
        e.printStackTrace();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    Log.e("Chw","ping  result "+result);
    return result;
}