// 设置为无标题栏 requestWindowFeature(Window.FEATURE_NO_TITLE); // 设置为全屏模式 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 

//获取屏幕的高度和宽度用到WindowManager这个类WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE); int width = wm.getDefaultDisplay().getWidth();int height = wm.getDefaultDisplay().getHeight();

TelephonyManager tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);String imei = tm.getDeviceId();//移动设备国际辨识码String imsi = tm.getSubscriberId();//国际移动用户识别码String tel = tm.getLine1Number();//电话号码        String model =  android.os.Build.MODEL;//手机型号String sdk = android.os.Build.VERSION.SDK;//SDK版本    String release = android.os.Build.VERSION.RELEASE;//系统版本//根据IMSI号码识别移动供应商public String getProvidersName(String IMSI) {    String ProvidersName = null;    // IMSI号前面3位460是国家，紧接着后面2位00 02是中国移动，01是中国联通，03是中国电信。    if (IMSI.startsWith("46000") || IMSI.startsWith("46002")) {        ProvidersName = "中国移动";    } else if (IMSI.startsWith("46001")) {        ProvidersName = "中国联通";    } else if (IMSI.startsWith("46003")) {        ProvidersName = "中国电信";    }    return ProvidersName;}

public void showToast(String text){    Toast.makeText(this, text, Toast.LENGTH_SHORT).show();}

//把一个字符串写进文件public void writeFile(String str,String path){    File file;    FileOutputStream out;    try{        //创建文件        file = new File(path);        file.createNewFile();        //打开文件file的输出流        out = new FileOutputStream(file);        //将字符串转换成byte数组写入文件        out.write(str.getBytes());        out.close();    }catch(IOException e){            }}

//把文件内容读出到字符串public String getFileInfo(String path){    File file;    String str = "";    FileInputStream in;    try{        //打开文件的inputStream        file  new File(path);        in = new FileInputStream(file);        //将文件内容读入byte数组        int length = (int)file.length();        byte [] temp = new byte[length];        in.read(temp,0,length);        str = EncodingUtils.getString(temp, "utf-8");        in.close();    }catch(IOException e){            }    return str;}

//调出系统安装应用String fileName = Environment.getExternalStorageDirectory() + apkName;Uri uri = Uri.fromFile(new File(fileName));Intent intent = new Intent(Intent.ACTION_VIEW);intent.setDataAndType(uri, "application/vnd.android.package-archive");this.startActivity(intent);//调出系统卸载应用Uri packageURI = Uri.parse("package: your.app.id");Intent intent = new Intent(Intent.ACTION_DELETE,packageURI);startActivity(intent);

//第一步，定义一个变量，用于标识是否退出boolean isExit;//第二步，重写Activity中onKeyDown方法@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {    if (keyCode == KeyEvent.KEYCODE_BACK) {        exit();        return false;    } else {        return super.onKeyDown(keyCode, event);    }}//第三步，写一个退出方法public void exit(){    if (!isExit) {        isExit = true;        Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show();        mHandler.sendEmptyMessageDelayed(0, 2000);    } else {        Intent intent = new Intent(Intent.ACTION_MAIN);        intent.addCategory(Intent.CATEGORY_HOME);        startActivity(intent);        System.exit(0);    }}//第四步，根据exit()方法中的的消息，写一个HandlerHandler mHandler = new Handler() {    @Override    public void handleMessage(Message msg) {        // TODO Auto-generated method stub        super.handleMessage(msg);        isExit = false;    } };