手机安全卫士_spalsh页面01

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<item name= "android:windowNoTitle" >true</item> //设置没有标题,背下来,没有联想功能

</style >

*可以用这方法获取包的一些信息,如:版本名称,版本号...

private PackageManager pm ;//包管理者

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout. activity_spalsh);

tv_spalsh_version = (TextView) findViewById(R.id.tv_spalsh_version );

pm = getPackageManager();

PackageInfo pi = pm.getPackageInfo(getPackageName(), 0);//包的信息

tv_spalsh_version.setText(pi.versionName );//获得包的版本名称

打开快捷键 CTRL+N

private void checkUpdate() {

new Thread( new Runnable() { //网络连接过程必须在子线程中使用,主线程上就报错

@Override

public void run() {

URL url = new URL(getResources().getString(R.string.update_url ));//使用xml中的update_url用于修改

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout(3000);

conn.setRequestMethod( "GET");//网络连接模板

if (200 == conn.getResponseCode()) { //200表示连接成功

InputStream input = conn.getInputStream();

String jsonStr = StreamUtils.convertStream2String(input); //将字符流转换为字符串,用一个工具类表示出来

System. out.println(jsonStr);

}

}).start();

}

<?xml version= "1.0" encoding ="utf-8"?>

<string name="update_url" >http://192.168.56.1:8080/ms39/update.json </string> //配置文件,方便增删改查

</resources>

update.json

{code:2,name:"中秋巨献版",url:"http://192.168.56.1:8080/ms39/update",desc:"手机卫士,中秋巨献,快来下载吧,下载送月饼,月饼找博主要."}

//格式一定要正确,不然会出错

<uses-permission android:name ="android.permission.INTERNET"/> //清单文件上要设置网络权限

public class StreamUtils { //字符流转换为字符串的工具类

public static String convertStream2String(InputStream input){

ByteArrayOutputStream baos = new ByteArrayOutputStream();//固定写法

try {

byte[] buffer =new byte[1024];

int len=-1;

while((len=input.read(buffer))!=-1){

baos.write(buffer, 0, len);//字符流写入的三部曲

}

} catch (IOException e) {

e.printStackTrace();

}

return new String(baos.toByteArray());

}

public void run() {

Message msg = Message. obtain();//主线程与子线程连接的中间变量,固定格式

try {

URL url = new URL(getResources().getString(R.string.update_url ));

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout(3000);

conn.setRequestMethod( "GET");

if (200 == conn.getResponseCode()) {

InputStream input = conn.getInputStream();

String jsonStr = StreamUtils.convertStream2String(input);

System. out.println(jsonStr);

JSONObject json = new JSONObject(jsonStr);//获得json对象,记住格式

int code = json.getInt("code" ); //json相当于键值对,通过键去找值

String name = json.getString("name");

desc = json.getString( "desc");

if (currentCode == code) { //判断当前版本与json版本是否一致

//不需要更新.跳转到主页面

msg.what = JUMP2HOME; //通过msg.what去主线程Handler查找对应的操作

} else{

//弹出提示用户是否升级对话框

msg. what = SHOW_CONFIRM_DIALOG; //通过msg.what去主线程Handler查找对应的操作

}

}else{

//服务器出错

jump2Home();

}

finally{

handler.sendMessage(msg);//固定格式,主线程调用子线程

}

}).start();

private Handler handler = new Handler (){ //没什么好说的,主线程的固定格式,记住就行

public void handleMessage(Message msg) {

switch (msg.what ) {

case SHOW_CONFIRM_DIALOG :

showConfirmUpdateDialog();

break;

case JUMP2HOME :

jump2Home();

break;

default:

break;

}

};

protected void showConfirmUpdateDialog() { //显示是否确认升级对话框

AlertDialog.Builder adb = new AlertDialog.Builder(this );

adb.setTitle( "升级提醒" ); /设置对话框标题

adb.setMessage( desc); //设置对话框内容

adb.setOnCancelListener( new OnCancelListener() { //设置取消对话框监听机制,相当于点击右上角的x

@Override

public void onCancel(DialogInterface dialog) {

// TODO Auto-generated method stub

jump2Home();

}

});

adb.setPositiveButton("立刻升级" , new OnClickListener() { //确认按钮

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

.....

}

});

adb.setNegativeButton("暂不升级" , new OnClickListener() { //取消按钮

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

jump2Home();

}

});

adb.show(); //将对话框展示出来,别忘记了这步

}

protected void jump2Home() { //跳转至主页面

// TODO Auto-generated method stub

Intent intent = new Intent(this ,HomeActivity.class); //通过反射获取意图对象

startActivity(intent); //活动开启

finish(); //关闭活动 A调用你,就关闭A.适用于一个activity调用另一个activity.

}

AlphaAnimation aa = new AlphaAnimation(0f, 1f);//一个有透明到实体渐变的动画

aa.setDuration(2000);//设置时间

findViewById(R.id.rl_spalsh).startAnimation(aa);//动画开始

protected void downloadFile() { //下载文件

HttpUtils httputils = new HttpUtils(); //使用了xUtils-2.6.11.jar工具包,要想关联源码,必须先删除自动add to path的jar包,然后手动去add to path,最后在order and export中选中jar包,使它可以在程序中使用

httputils.download(updateUrl, Environment.getExternalStorageDirectory()+ "/temp.apk", new RequestCallBack<File>() {//下载文件,固定写法

@Override

public void onSuccess(ResponseInfo<File> responseInfo) { //下载成功

System. out.println("文件下载成功" +responseInfo.result.getAbsolutePath());

}

@Override

public void onFailure(HttpException error, String msg) { //下载失败

jump2Home();

}

@Override

public void onLoading(long total, long current, boolean isUploading) {

tv_splash_update_info.setText(current+"/" +total); //下载数字显示的进度条 34532/453445

}

});

要想下载,要在清单文件中添加2个权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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