开源中国源码解析之Splash页面

涉及的类

AppStart   //欢迎页面MainActivity //主页面LogUploadService //上传日志的服务TDevice  //手机设备工具类

功能介绍

1.设置视图,并且让视图做Alpha动画
2.监听动画,在动画播放完成之后,开启服务上传日志,并且跳转到MainActivity
3.在onResume方法中让本地缓存版本与现在的版本进行比较,如果现在的版本大于缓存的版本,则清除图片缓存

具体代码分析

1.设置视图,监听动画

// 防止第三方跳转时出现双实例Activity aty=AppManager.getActivity(MainActivity.class);    if (aty != null && !aty.isFinishing()) {            finish();      }// SystemTool.gc(this); //针对性能好的手机使用，加快应用相应速度final View view = View.inflate(this, R.layout.app_start, null);        setContentView(view);// 渐变展示启动屏AlphaAnimation aa = new AlphaAnimation(0.5f, 1.0f);        aa.setDuration(800);        view.startAnimation(aa);aa.setAnimationListener(new AnimationListener() {    @Override    public void onAnimationEnd(Animation arg0) {                redirectTo();            }    @Override    public void onAnimationRepeat(Animation animation) {            }            @Override    public void onAnimationStart(Animation animation) {            }});

2.在动画结束后,进行跳转与上传日志 redirectTo()

/*** 跳转到...*/private void redirectTo() {  Intent uploadLog = new Intent(this, LogUploadService.class);        startService(uploadLog);        Intent intent = new Intent(this, MainActivity.class);        startActivity(intent);        finish();}

3.在onResume方法中让本地缓存版本与现在的版本进行比较,如果现在的版本大于缓存的版本,则清除图片缓存

@Overrideprotected void onResume() {   super.onResume();   int cacheVersion = PreferenceHelper.readInt(this, "first_install","first_install", -1);   int currentVersion = TDevice.getVersionCode();   if (cacheVersion < currentVersion) {       PreferenceHelper.write(this, "first_install", "first_install",currentVersion);            cleanImageCache(); //清除图片缓存        }    }

4.清除图片缓存方法 cleanImageCache()

private void cleanImageCache() {        final File folder = FileUtils.getSaveFolder("OSChina/imagecache");        File[] files = folder.listFiles();        if (files != null && files.length > 0) {            KJAsyncTask.execute(new Runnable() {                @Override                public void run() {                    if (folder.isDirectory()) {                        for (File file : folder.listFiles()) {                            file.delete();                        }                    }                }            });        }    }