Android开发基础知识回顾

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1.获取版本信息

public static String getVersionName(Context context) {String versionName;// 获取包管理器PackageManager packageManager = context.getPackageManager();try {    PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0);    versionName = packageInfo.versionName;} catch (NameNotFoundException e) {    versionName = "获取版本信息错误";    e.printStackTrace();}return versionName;}

2.获取服务器版本信息

class GetServerVisionRunnable implements Runnable {        @Override        public void run() {            InputStream is = null;            BufferedReader br = null;            try {                // 创建连接                HttpURLConnection connection = (HttpURLConnection) new URL(                        "http://192.168.129.102:8080/version.json").openConnection();                // 设置连接超时时间                connection.setConnectTimeout(5000);                // 设置读取超时时间                connection.setReadTimeout(5000);                // 连接                connection.connect();                String result = "";                if (connection.getResponseCode() == 200) {                    is = connection.getInputStream();                    br = new BufferedReader(new InputStreamReader(is));                    String readlline;                    while ((readlline = br.readLine()) != null) {                        result += readlline;                    }                    JSONObject json = new JSONObject(result);                    int serverVersionCode = json.optInt("versioncode");                }            } catch (Exception e) {                e.printStackTrace();            } finally {                CommonUtils.CloseStream(is);                CommonUtils.CloseStream(br);            }        }    }

3.下载、安装apk

class DownloadRunnable implements Runnable {    private InputStream inputStream;    private FileOutputStream fos;    private ProgressDialog pd;    public DownloadRunnable(ProgressDialog pd) {        this.pd = pd;    }    @Override    public void run() {        try {            // 初始化            HttpURLConnection connection =                    (HttpURLConnection) new URL(downUrl).openConnection();            connection.setConnectTimeout(5000);            connection.setReadTimeout(5000);            connection.connect();            // 连接成功            if (connection.getResponseCode() == 200) {                // 创建文件                File file = new File(Environment.getExternalStorageDirectory(), "test.apk");                inputStream = connection.getInputStream();                // 获取文件总长度                int totalLength = connection.getContentLength();                // 设置进度条的总大小                pd.setMax(totalLength);                fos = new FileOutputStream(file);                int len;                byte[] buffer = new byte[1024];                int current = 0;                while ((len = inputStream.read(buffer)) != -1) {                    fos.write(buffer, 0, len);                    current += len;                    // 设置进度条的进度                    pd.setProgress(current);                }                // 隐藏进度条                pd.dismiss();                // 安装应用                Intent intent = new Intent();                intent.setAction("android.intent.action.VIEW");                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                intent.addCategory("android.intent.category.DEFAULT");                              intent.setDataAndType(Uri.parse("file:" + file.getAbsolutePath()),                        "application/vnd.android.package-archive");                startActivityForResult(intent, REQ_CODE_INSTALL_APP);            }        } catch (Exception e) {            e.printStackTrace();        } finally {            CommonUtils.CloseStream(inputStream);            CommonUtils.CloseStream(fos);        }    }}

4.动画

        //沿Y轴旋转的属性动画        ObjectAnimator animator = ObjectAnimator.ofFloat(iv_icon, "rotationY", 0, 45, 90, 135, 180, 225, 270, 315, 360);        // 时常        animator.setDuration(2000);        // 重复次数        animator.setRepeatCount(ObjectAnimator.INFINITE);        // 重复模式        animator.setRepeatMode(ObjectAnimator.REVERSE);        animator.start();

5.按钮按压效果选择器

在res/drawable/目录下新建一个正常状态下的shape

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