一.splash界面的作用
- 用来展现产品的Logo
- 应用程序初始化的操作
- 检查应用程序的版本
- 检查当前应用程序是否合法注册
二、界面的xml定义
写一个布局背景设置为产品的logo图片,再添加一个textview显示版本号。
<TextView
android:id="@+id/tv_splash_version"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textStyle="bold"
android:shadowDx="1"//阴影的偏移量
android:shadowDy="1"
android:shadowRadius="0.2"//阴影的半径
android:shadowColor="#ffff00"
android:text="版本:1.0"
android:textSize="16sp"
android:layout_centerInParent="true"/>
三、动态获取版本号的方法
public String getAppVersion(){
PackageManager pm = getPackageManager();
try {
PackageInfo info = pm.getPackageInfo(getPackageName(), 0);
return info.versionName;
} catch (NameNotFoundException e) {
e.printStackTrace();
//不可能发生;
return "";
}
}
四、链接服务器获取更新信息
-
升级提醒的对话框
protected void showUpdateDialog() { AlertDialog.Builder build = new Builder(this); build.setTitle("发现新版本"); build.setMessage(description); build.setNegativeButton("立刻升级", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //升级的代码; }; }); build.setPositiveButton("下次再说", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); enterHome(); } }); build.show();
-
在子线程中请求服务器的代码 checkup()方法
private void checkup() { new Thread() { public void run() { Message msg = Message.obtain(); long startTime = System.currentTimeMillis();//启动该线程的系统时间 try { //请求网络的代码 URL url = new URL(getString(R.string.serverurl)); HttpURLConnection conn = (HttpURLConnection) url .openConnection(); conn.setRequestMethod("GET");//请求方法 conn.setConnectTimeout(4000);//超时时间 int code = conn.getResponseCode();//返回码200请求成功 if (code == 200) { InputStream is = conn.getInputStream(); String result = StreamTools.readFromStream(is); Log.i(TAG, "联网成功" + result); JSONObject obj = new JSONObject(result);//解析json字符串 String version = (String) obj.get("version");//版本信息 description = (String) obj.get("description");//描述信息 apkurl = (String) obj.get("apkurl"); if (getAppVersion().equals(version)) { msg.what = ENTER_HOME; } else { msg.what = SHOW_UPDATE_DIALOG; } } } catch (MalformedURLException e) { e.printStackTrace(); msg.what = URL_ERROR; } catch (IOException e) { e.printStackTrace(); msg.what = NETWORK_ERROR; } catch (JSONException e) { e.printStackTrace(); msg.what = JSON_ERROR; } finally { handler.sendMessage(msg); long endTime = System.currentTimeMillis();//该线程执行完毕的时间 long dTime = endTime-startTime;//该线程的阻塞时间 if (dTime<3000) { try { Thread.sleep(3000-dTime);//若该线程的阻塞时间小于三秒继续睡眠到三秒 } catch (InterruptedException e) { e.printStackTrace(); } } } } }.start(); }
handler
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
switch (msg.what) {
case SHOW_UPDATE_DIALOG:
showUpdateDialog();
break;
case ENTER_HOME:
Toast.makeText(getApplicationContext(), "", 0).show();
enterhome();
break;
case URL_ERROR:
Toast.makeText(getApplicationContext(), "URL_ERROR", 0).show();
enterhome();
break;
case NETWORK_ERROR:
Toast.makeText(getApplicationContext(), "NETWORK_ERROR", 0).show();
enterhome();
break;
case JSON_ERROR:
Toast.makeText(getApplicationContext(), "JSON_ERROR", 0).show();
enterhome();
break;
}
}
};
五、下载文件(使用Afinal框架)并调用系统安装工具安装APK
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
FinalHttp finalHttp = new FinalHttp();
finalHttp.download(apkurl,Environment.getExternalStorageDirectory().getAbsolutePath()+
"/mobilesafe2.0.apk" , new AjaxCallBack<File>() {
@Override
public void onLoading(long count, long current) {
super.onLoading(count, current);
tv_uapdate_info.setVisibility(View.VISIBLE);
int progress =(int) (current*100/count);
tv_uapdate_info.setText("下载进度:"+progress+"%");
}
@Override
public void onFailure(Throwable t, int errorNo,
String strMsg) {
t.printStackTrace();
Toast.makeText(getApplicationContext(), "下载失败", 0).show();
enterhome();
super.onFailure(t, errorNo, strMsg);
}
@Override
public void onSuccess(File t) {
super.onSuccess(t);
installAPK(t);
}
private void installAPK(File t) {
Intent intent = new Intent();//自动安装程序可调用该段代码
intent.setAction("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.setDataAndType(Uri.fromFile(t), "application/vnd.android.package-archive");
startActivity(intent);
}
});
}else{
Toast.makeText(getApplicationContext(), "请插入内存卡再试",0).show();
return;
}
其他:
1、显示4.0的样式:方式是去掉功能清单里的Activity对应的android:theme;
放到application里面;
2、当splash页面弹出升级提示框过滤点击返回的是两种方式:
builder.setCancelable(false);
设置setOnCancelListener 当触屏的时候直接进入主页面
对话框是挂载在Activity上面的,如果Activity不存在,对话框就不能被创建。
getApplicationContext();生命周期长,只要应用还存活它就存在;this 生命周期短,只要Activity不存在了,系统就会回收
其中:getBaseContext(),getApplication(),getApplicationContext(); 都不能放在AlertDialog做上下文;
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