安卓的自动下载更新和安装

之前做过有关安卓部分的下载和自动安装打开，忘记记录了，现在补上

代码如下：

public class MainActivity extends BaseActivity {

    public static MainActivity instance = null;
    public String mLocalVersionName = "";//定义当前的APP版本号
    private ProgressDialog mDialog;//下载更新的进度条提示框

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

      
                        try {
                            //获取软件版本号，对应AndroidManifest.xml下android:versionCode
                            mLocalVersionName = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
                        } catch (PackageManager.NameNotFoundException e) {
                            e.printStackTrace();
                        }
                        //这里是请求后台接口，获取服务器上传的APP版本号，然后调用checkversion方法，用本地的和后台的服务器版本做对比，如果版本不一样就提示更新
                        OkHttpUtils.post()
                                .url(Constant.BASEURL)
                                .addParams("type", "0")
                                .build().execute(new StringCallback() {
                            @Override
                            public void onError(Request request, Exception e) { }

                            @Override
                            public void onResponse(String response) {
                                UpdataSystem bean = new Gson().fromJson(response, UpdataSystem.class);
                                checkVersion(bean.getExtend().getString());//传入后台的版本号，对比
                            }
                        });
    }

    public void checkVersion(String netVersionName) {
        if (!mLocalVersionName.equals(netVersionName)) {
            loadNewVersion();//发现新版本就更新
        } else {
        }
    }

    private void loadNewVersion() {
        final String url = Constant.Url + "pic/app/xxx.apk";//这里是链接文件的地址
        mDialog = new ProgressDialog(MainActivity.this);
        mDialog.setMax(100);
        mDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        mDialog.show();
        OkHttpUtils.get().url(url).build()
                .execute(new FileCallBack(getExternalCacheDir().getAbsolutePath(), "app.apk") {
                    @Override
                    public void inProgress(float progress) {
                        //进度条的更新
                        mDialog.setProgress((int) (100 * progress));
                    }
                    @Override
                    public void onError(Request request, Exception e) { }

                    @Override
                    public void onResponse(File response) {
                        //下载完毕之后走这个方法，安装应用并自动打开
                        excutesucmd(String.valueOf(response));
                    }
                });
    }

    protected void excutesucmd(String currenttempfilepath) {
        Process process = null;
        OutputStream out = null;
        InputStream in = null;
        try {
            // 请求root
            process = Runtime.getRuntime().exec("su");
            out = process.getOutputStream();
            // 调用安装
            out.write(("pm install -r " + currenttempfilepath + "\n").getBytes());
            in = process.getInputStream();
            int len = 0;
            byte[] bs = new byte[256];
            while (-1 != (len = in.read(bs))) {
                String state = new String(bs, 0, len);
                if (state.equals("success\n")) {
                    //安装成功后的操作

                    //静态注册自启动广播
                    Intent intent = new Intent();
                    //与清单文件的receiver的anction对应
                    intent.setAction("android.intent.action.PACKAGE_REPLACED");
                    //发送广播
                    sendBroadcast(intent);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.flush();
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}