app在线升级版本

1.添加依赖

implementation 'com.lzy.net:okgo:3.0.4'

2.清单文件

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.INTERNET"/>

    <!--下面这个权限一定还要添加，否则程序不会自动安装-->
    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>

3.在application节点中添加

<provider
            android:name="com.example.a86156.aaaaaa.MyFileProvider"
            android:authorities="${applicationId}.MyFileProvider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths"/>
        </provider>

4.创建res/xml/fiel_path.xml文件

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- 其中external-path节点表示Environment.getExternalStorageDirectory()路径
     path表示apk文件在Environment.getExternalStorageDirectory()路径下的文件夹名称-->

    <external-path name="external_storage_root" path="download" />
</paths>

5.创建一个空类MyFileProvider并继承FileProvider，空引用

public class MyFileProvider extends FileProvider {

6.布局文件activity_main.xml

 <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="50dp"
        android:text="在线升级"
        android:id="@+id/download"
        />

7.MainActivity.java主程序

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Context context;
    ProgressDialog dialog;
    Button down_v;
    String apkAdd;
    String newVer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.hide();
        }
        context = MainActivity.this;
        initView();
        Myprogress();

    }

    /**
     * 初始化所有控件
     */
    private void initView() {
        down_v = findViewById(R.id.download);
        down_v.setOnClickListener(this);
    }

    /**
     * 定义下载进度框
     */
    private void Myprogress() {
        dialog = new ProgressDialog(this);
        dialog.setIcon(R.drawable.ic_launcher_background);
        dialog.setMessage("下载中...");
        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);


    }

    /**
     * android6.0之后要动态获取权限
     */
    private void checkPermission() {
        final int REQUEST_EXTERNAL_STORAGE = 1;
        String[] PERMISSIONS_STORAGE = {
                Manifest.permission.READ_EXTERNAL_STORAGE,
                Manifest.permission.WRITE_EXTERNAL_STORAGE};
        try {
            //检测是否有写的权限
            int permission = ActivityCompat.checkSelfPermission(MainActivity.this,
                    "android.permission.WRITE_EXTERNAL_STORAGE");
            if (permission != PackageManager.PERMISSION_GRANTED) {
                // 没有写的权限，去申请写的权限，会弹出对话框
                ActivityCompat.requestPermissions(MainActivity.this, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }



    /**
     * 获取当前app的版本信息
     *
     * @param context
     * @return
     */
    private String getVersinName(Context context) {
        String vername = "";
        PackageManager manager = context.getPackageManager();
        try {
            PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
            int code = info.versionCode;  //获取版本号
            vername = info.versionName; //获取版本名
            Log.d("版本信息", vername + "   " + code);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return vername;
    }

    /**
     * 获取服务器的apk下载地址
     */
    private void getLoadAppinfo(){
        OkGo.<String>get("服务器地址")
                .tag(this)
                .cacheMode(CacheMode.NO_CACHE)
                .params("Value","4003")
                .execute(new StringCallback() {
                    @Override
                    public void onSuccess(Response<String> response) {
                        try {
                            JSONObject object = new JSONObject(response.body());
                            JSONArray jr = new JSONArray(object.getString("table"));
                            for (int i = 0; i <jr.length() ; i++) {
                                JSONObject o = new JSONObject(jr.get(i).toString());
                                apkAdd = o.getString("address");
                                newVer = o.getString("ver");
                            }
                            //用当前的app版本与服务器上面的版本进行比较
                            String oldVer = getVersinName(context);
                            if(!oldVer.equals(newVer)){
                                //发现新版本，开始下载
                                downLoadApk(apkAdd);
                            }else {
                                //无需下载
                                Toast.makeText(context,"当前已是最新版本，无需下载",Toast.LENGTH_SHORT).show();
                            }

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                });
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.download:
                checkPermission();
                getLoadAppinfo();
                break;
        }
    }


    /**
     * 下载apk
     */
    private void downLoadApk(String path) {
        //下载到的文件夹路径
        final String filePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/download";
        //下载后的新名称
        final String fileName = "OTG-H30.apk";
        File file = new File(filePath + "/" + fileName);
        if (file.exists()) {
            file.delete();
        }
        OkGo.<File>get(path)
                .execute(new FileCallback(filePath, fileName) {
                    @Override
                    public void onStart(com.lzy.okgo.request.base.Request<File, ? extends com.lzy.okgo.request.base.Request> request) {
                        super.onStart(request);

                    }

                    @Override
                    public void onSuccess(Response<File> response) {

                    }

                    @Override
                    public void onError(Response<File> response) {
                        super.onError(response);
                        dialog.show();
                        dialog.setMessage("下载出错...");
                    }

                    @Override
                    public void downloadProgress(Progress progress) {
                        super.downloadProgress(progress);
                        int res = (int) (progress.fraction * 100);
                        dialog.show();
                        dialog.setMessage("下载中...");
                        dialog.setProgress(res);
                    }

                    @Override
                    public void onFinish() {
                        super.onFinish();
                        //下载完成后跳转安装
                        dialog.dismiss();
                        Intent intent = new Intent(Intent.ACTION_VIEW);
                        File file = new File(filePath + "/" + fileName);
                        Uri uri;
                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                            uri = FileProvider.getUriForFile(MainActivity.this, BuildConfig.APPLICATION_ID + ".MyFileProvider", file);
                            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                        } else {
                            uri = Uri.fromFile(file);
                        }
                        intent.setDataAndType(uri, "application/vnd.android.package-archive");
                        startActivity(intent);

                    }
                });
    }

}