Android7.0项目实现更新操作，解决 android.os.FileUriExposedException

**/实现检查更新操作的主activity
**
public class UpgradeActivity extends AppCompatActivity {


    private ImageView opening;
    private File file;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav
                        // bar
                        | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
                        | View.SYSTEM_UI_FLAG_IMMERSIVE);
        setContentView(R.layout.activity_upgrade);
        opening=(ImageView)findViewById(R.id.opening) ;

        DisplayMetrics metric = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metric);
        int screen_x = metric.widthPixels;     // 屏幕宽度（像素）
        int screen_y = metric.heightPixels;   // 屏幕高度（像素）
        android.view.animation.Animation translateAnimation = new TranslateAnimation(50,50,200,0);//平移动画  从0,0,平移到100,100
        translateAnimation.setDuration(1500);//动画持续的时间为1.5s
        opening.setAnimation(translateAnimation);//给imageView添加的动画效果
        translateAnimation.setFillEnabled(true);//使其可以填充效果从而不回到原地
        translateAnimation.setFillAfter(true);//不回到起始位置
        //如果不添加setFillEnabled和setFillAfter则动画执行结束后会自动回到远点
        translateAnimation.startNow();//动画开始执行 放在最后即可

        new Handler().postDelayed(new Runnable(){//开场logo2秒后进入检查更新
            @Override
            public void run() {
                // TODO Auto-generated method stub

                doUpgrade();

            }
        }, 2000);


    }
    private void showDialogUpdate(String uri,String versionName,String description){
        android.app.AlertDialog.Builder builder=new android.app.AlertDialog.Builder(UpgradeActivity.this);
        builder.setTitle("版本升级").
                setIcon(R.mipmap.ic_launcher);
        if ((versionName.length()+description.length())<26){
            builder.setMessage("版本名  ："+versionName+"\n"+"更新内容："+description+"\n\n");
        }else {
            builder.setMessage("版本名  ："+versionName+"\n"+"更新内容："+description+"\n\n\n");
        }
            builder.setCancelable(false);
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        loadNewVersionProgress(uri);
                    }
                });
        android.app.AlertDialog alertDialog=builder.create();
        alertDialog.show();
        WindowManager.LayoutParams  lp= alertDialog.getWindow().getAttributes();
        lp.width=800;//定义宽度
        lp.height=380;//定义高度
        alertDialog.getWindow().setAttributes(lp);
        alertDialog.getButton(DialogInterface.BUTTON_POSITIVE).setTextColor(Color.parseColor("#FF5E5E"));
        alertDialog.getButton(DialogInterface.BUTTON_POSITIVE).setTextSize(30);
        try {
            Field mAlert = android.app.AlertDialog.class.getDeclaredField("mAlert");
            mAlert.setAccessible(true);
            Object mAlertController = mAlert.get(alertDialog);
            Field mTitle = mAlertController.getClass().getDeclaredField("mTitleView");
            mTitle.setAccessible(true);
            TextView mTitleView = (TextView) mTitle.get(mAlertController);
            mTitleView.setTextSize(35);
            mTitleView.setTextColor(Color.BLACK);
            //通过反射修改message字体大小和颜色
            Field mMessage = mAlertController.getClass().getDeclaredField("mMessageView");
            mMessage.setAccessible(true);
            TextView mMessageView = (TextView) mMessage.get(mAlertController);
            mMessageView.setTextSize(30);
            mMessageView.setTextColor(Color.BLACK);
            mMessageView.setPadding(40,0,0,55);
        } catch (IllegalAccessException e1) {
            e1.printStackTrace();
        } catch (NoSuchFieldException e2) {
            e2.printStackTrace();
        }
    }
    private void loadNewVersionProgress(String uri){
        final ProgressDialog pd;
        Context context=UpgradeActivity.this;
        pd=new ProgressDialog(this);
        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        pd.setMessage("正在为你更新中");
        pd.setCancelable(false);
        pd.show();
        new Thread(){
            @Override
            public void run() {
                try{
                    file=getFileFromServer(uri,pd);
                    sleep(3000);
//                    File newFile = new File(Environment.getExternalStorageDirectory()+"/idrmsapp", "app-armeabi-v7a-debug.apk");
                    installNormal(getApplication(),file);
                    pd.dismiss();
                }catch (Exception e){//下载失败
                    e.printStackTrace();
                }
            }
        }.start();
    }

    //普通安装
    private static void installNormal(Context context,File file) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        //版本在7.0以上是不能直接通过uri访问的
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.N) {
            // 由于没有在Activity环境下启动Activity,设置下面的标签
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            //参数1 上下文, 参数2 Provider主机地址 和配置文件中保持一致   参数3  共享的文件
            Uri apkUri = FileProvider.getUriForFile(context, "com.beike.idrms.fileprovider", file);
            //添加这一句表示对目标应用临时授权该Uri所代表的文件
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
        } else {
            intent.setDataAndType(Uri.fromFile(file),
                    "application/vnd.android.package-archive");
        }
        context.startActivity(intent);
    }
    public static File getFileFromServer(String uri,ProgressDialog pd)throws Exception{
        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
            URL url=new URL(uri);
            HttpURLConnection conn=(HttpURLConnection)url.openConnection();
            conn.setConnectTimeout(5000);
            pd.setMax(conn.getContentLength());//获取文件大小
            InputStream is=conn.getInputStream();
            long time=System.currentTimeMillis();//当前时间
            File file=new File(Environment.getExternalStorageDirectory()+"/idrmsapp",time+"");
            FileOutputStream fos=new FileOutputStream(file);
            BufferedInputStream bis=new BufferedInputStream(is);
            byte[] buffer=new byte[1024];
            int len;
            int total=0;
            while (-1!=(len=bis.read(buffer))){
                fos.write(buffer,0,len);
                total+=len;
                pd.setProgress(total);//获取当前下载量
            }
            fos.close();
            bis.close();
            is.close();
            return file;
        }
        else {
            return null;
        }
    }

    private int getVersionCode(){
        return BuildConfig.VERSION_CODE;

    }

    private String downloadUrl;
    private String versionName;
    private String description;
    private Handler showUpgradeDialogHandler = new Handler(){
        @Override
        public void dispatchMessage(Message msg) {
            super.dispatchMessage(msg);
            showDialogUpdate(downloadUrl,versionName,description);
        }
    };


    private void doUpgrade(){
        OkHttpConnection mOkHttpConnection;
        mOkHttpConnection = new OkHttpConnection();
        mOkHttpConnection.getCode(ConstantConfig.GET_VERSION,getVersionCode(),new ResponseCallback(){
            @Override
            public void failed(Call call, IOException e) {
                Message msg = new Message();
                msg.obj = "do";
            }

            @Override
            public void success(Call call, Response response) {
                Message msg = new Message();
                msg.obj = "do";
                try {
                    JSONObject everyData;
                    String data = response.body().string();
                    Log.i("ResponseData", data);
                    if (null != data) {
                        JSONObject jsonObject = new JSONObject(data);
                        int code = jsonObject.getInt("code");
                        if (code==ConstantConfig.SUCESS_CODE){
                            String updata = jsonObject.getString("data");
                            if (0<updata.length()){
                                everyData=new JSONObject(updata);
                                downloadUrl=everyData.getString("downloadUrl");
                                versionName=everyData.getString("versionName");
                                description=everyData.getString("description");
                                showUpgradeDialogHandler.sendEmptyMessage(0);
                            }
                        }else {
                            Intent intent=new Intent();
                            intent.setClass(UpgradeActivity.this,ImageSliderShowActivity.class);
                            startActivity(intent);
                        }

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

}

这个是 res文件夹下pei'配置文件epaths.xml

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

在AndroidManifest.xml清单中添加权限

<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INSTALL_PACKAGES"

也在其中加入provider配置

<provider
    android:authorities="com.beike.idrms.fileprovider"
    android:name="android.support.v4.content.FileProvider"
    android:grantUriPermissions="true"
    android:exported="false">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/filepaths"/>
</provider>