模拟版本更新

/**
 * 一个逻辑非常简单的版本更新
 * 在真正的项目中往往需要更多的条件限制
 */
public class MainActivity extends AppCompatActivity {

    String urlVersion = "http://www.地址.com";
// String urlApk = "http://img1.gtimg.com/20/2030/203036/20303644_980x1200_0.jpg";
 String urlApk = "http://gdown.baidu.com/data/wisegame/f98d235e39e29031/baiduxinwen.apk";
//

 ProgressDialog pd ;
@Override
    protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//发起网路请求获取服务器版本号
 getServierVersion(urlVersion);
    }

private void getServierVersion(String url) {
new AsyncTask<String ,String, String>(){

@Override
            protected String doInBackground(String... params) {
//睡眠3秒用来模拟 正在请求版本信息
 try {
                    Thread.sleep(3000);

                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
return null;
            }
@Override
            protected void onPostExecute(String s) {
super.onPostExecute(s);
//在UI线程中判断 服务器版本是否比本地高 高则弹出对话框
 if(CommonUtils.getVersionCode(MainActivity.this) < 2){
                    showDialog(CommonUtils.getVersionName(MainActivity.this),"2.1.0");
                }
            }

        }.execute(url);
    }

//弹出对话框显示更新内容
 public void showDialog(String oldName, String newName){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("版本更新")
                .setMessage("当前最新版本为"+newName+"，手机版本为"+oldName+"，是否跟新")
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
                    public void onClick(DialogInterface dialog, int which) {
pd = new ProgressDialog(MainActivity.this);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("正在更新...");
pd.setMax(100);
                        downLoadApk(urlApk);
                    }
                }).setNegativeButton("暂不更新", null).show();
    }


private void downLoadApk(String urlApk) {
//设置下载地址
 RequestParams params = new RequestParams(urlApk);
//设置下载文件的路径 开始时要注意判断 sd卡状态是否可用 本demo省略
// params.setSaveFilePath(Environment.getExternalStorageDirectory()+"/myapp/");
 params.setSaveFilePath(getCacheDir()+"/myapp/");
//设置文件名
 params.setAutoRename(true);
//使用ProgressCallback进行文件下载
 x.http().get(params, new Callback.ProgressCallback<File>() {


@Override
            public void onSuccess(File result) {
                Toast.makeText(MainActivity.this,"下载成功，准备安装",Toast.LENGTH_SHORT).show();
                Log.i("==========", "onSuccess: " + result);
//apk下载完成后，调用系统的安装方法 日考题 提供的apk有问题的 不能安装
 Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(Uri.fromFile(result), "application/vnd.android.package-archive");
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intent);
            }

@Override
            public void onError(Throwable ex, boolean isOnCallback) {
                Log.i("==========", "onError: ");
                Toast.makeText(MainActivity.this,"apk下载失败",Toast.LENGTH_SHORT).show();
            }
@Override
            public void onCancelled(CancelledException cex) {
            }
@Override
            public void onFinished() {
                Log.i("==========", "onError: ");
pd.cancel();
            }
@Override
            public void onWaiting() {
            }
@Override
            public void onStarted() {
            }
@Override
            public void onLoading(long total, long current, boolean isDownloading) {
//当前进度和文件总大小
 Log.i("==========","current："+ current +"，total："+total);

//让进度条按 XX／100的格式显示
 pd.setProgress((int) (current*100/total));
pd.show();
            }

        });
    }
}
/**
 * Created by yfeng on 2017/9/16.
 * 公用的工具类，可以放入一些杂七杂八的静态方法
 */

public class CommonUtils {

//获取当前应用的版本号
 public static int getVersionCode(Context context){

int versionCode = 0;
try {
// 获取packagemanager的实例
 PackageManager packageManager = context.getPackageManager();
// getPackageName()是你当前类的包名，0代表是获取版本信息
 PackageInfo packInfo = packInfo = packageManager.getPackageInfo(context.getPackageName(),0);
            versionCode = packInfo.versionCode;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
return versionCode;

    }

//获取当前应用的版本名字
 public static String getVersionName(Context context){
        String versionName = "";
try {
// 获取packagemanager的实例
 PackageManager packageManager = context.getPackageManager();
// getPackageName()是你当前类的包名，0代表是获取版本信息
 PackageInfo packInfo = packInfo = packageManager.getPackageInfo(context.getPackageName(),0);
            versionName = packInfo.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
return versionName;
    }

}