Android7.0 自动更新适配，包解析异常

问题：在Android7.0的手机上，自动更新的时候出现包解析异常，在其他的手机上没有这个问题。

原因：

Android7.0引入私有目录被限制访问和StrictMode API 。私有目录被限制访问是指在Android7.0中为了提高应用的安全性，在7.0上应用私有目录将被限制访问。StrictMode API是指禁止向你的应用外公开 file:// URI。 如果一项包含文件 file:// URI类型 的 Intent 离开你的应用，则会报出异常。

解决办法：

第一步：在AndroidManifest.xml中注册provider，provider可以向应用外提供数据。

<provider    android:authorities="包名.fileprovider"    android:name="android.support.v4.content.FileProvider"    android:grantUriPermissions="true"//这是设置uri的权限    android:exported="false">    <meta-data        android:name="android.support.FILE_PROVIDER_PATHS"        android:resource="@xml/file_paths"/>//在第二步的时候会有介绍</provider>

第二步：在res/xml中创建file_paths.xml文件。

<?xml version="1.0" encoding="utf-8"?><resources>    <paths>        <external-path path="" name="download" />    </paths></resources>

第三步：贴出我的自动更新下载的代码

public class UpdateManager {    private Context mContext;    private static String savePath ;    private String saveFileName ;    private ProgressBar mProgress; //下载进度条控件    private static final int DOWNLOADING = 1; //表示正在下载    private static final int DOWNLOADED = 2; //下载完毕    private static final int DOWNLOAD_FAILED = 3; //下载失败    private int progress; //下载进度    private boolean cancelFlag = false; //取消下载标志位    private String serverVersion; //从服务器获取的版本号    private String apkUrl;//    private String apkUrl = "http://liuliu.lejuhuyu.com/AndroidApk/liuliu-dashou-app-1.0.2.apk";    private String clientVersion; //客户端当前的版本号    private String updateDescription = "请更新当前最新版本"; //更新内容描述信息    private String forceUpdate; //是否强制更新    private String update;    private VersionBean mVersionBean;    private AlertDialog alertDialog1, alertDialog2; //表示提示对话框、进度条对话框    public UpdateManager(Context context,VersionBean versionBean) {        this.mContext = context;        this.mVersionBean = versionBean;        apkUrl = "http://liuliu.lejuhuyu.com/AndroidApk/liuliu-dashou-app-"+versionBean.getLastVersion()+".apk";        savePath = Environment.DIRECTORY_DOWNLOADS;        saveFileName = savePath + "/liuliu-dashou-app-"+versionBean.getLastVersion()+".apk";    }    /** 显示更新对话框 */    public void showNoticeDialog() {        serverVersion = mVersionBean.getLastVersion();        clientVersion = mVersionBean.getVersion();        L.e("apkUrl="+apkUrl);        L.e("savePath="+savePath);        L.e("saveFileName="+saveFileName);//        forceUpdate = StringUtils.getVersion();//        forceUpdate = "1";        forceUpdate = mVersionBean.getImportant();        update = mVersionBean.getUpdate();        //如果版本最新，则不需要更新        if (serverVersion.equals(clientVersion))            return;        if (update.equals("2"))            return;        AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);        dialog.setTitle("发现新版本 ：" + serverVersion);        dialog.setMessage(updateDescription);        dialog.setPositiveButton("现在更新", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface arg0, int arg1) {                // TODO Auto-generated method stub                arg0.dismiss();                showDownloadDialog();            }        });        //是否强制更新        if (forceUpdate.equals("2")) {            dialog.setNegativeButton("待会更新", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface arg0, int arg1) {                    // TODO Auto-generated method stub                    arg0.dismiss();                }            });        }        alertDialog1  = dialog.create();        alertDialog1.setCancelable(false);        alertDialog1.show();    }    /** 显示进度条对话框 */    public void showDownloadDialog() {        AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);        dialog.setTitle("正在更新");        final LayoutInflater inflater = LayoutInflater.from(mContext);        View v = inflater.inflate(R.layout.softupdate_progress, null);        mProgress = (ProgressBar) v.findViewById(R.id.update_progress);        dialog.setView(v);        //如果是强制更新，则不显示取消按钮//        if (forceUpdate.equals("1")) {//            dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {//                @Override//                public void onClick(DialogInterface arg0, int arg1) {//                    // TODO Auto-generated method stub//                    arg0.dismiss();//                    cancelFlag = false;//                }//            });//        }        alertDialog2  = dialog.create();        alertDialog2.setCancelable(false);        alertDialog2.show();        //下载apk        downloadAPK();    }    DownloadManager manager;    Cursor cursor;    DownloadManager.Request down;    DownloadManager.Query query;    ContentObserver contentObserver;    /** 下载apk的线程 */    public void downloadAPK() {        manager = (DownloadManager) LiuLiuApplication.getContext().getSystemService(Context.DOWNLOAD_SERVICE);        down = new DownloadManager.Request(Uri.parse(apkUrl));        // 设置允许使用的网络类型，这里是移动网络和wifi都可以        down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE                | DownloadManager.Request.NETWORK_WIFI);        // 显示下载界面        down.setVisibleInDownloadsUi(true);        // 设置下载路径和文件名        down.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "liuliu-dashou-app-"+mVersionBean.getLastVersion() + ".apk");        down.setMimeType("application/vnd.android.package-archive");        // 设置为可被媒体扫描器找到        down.allowScanningByMediaScanner();        down.setAllowedOverRoaming(false);//        down.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);        long id = manager.enqueue(down);        query = new DownloadManager.Query().setFilterById(id);        contentObserver = new ContentObserver(mHandler) {            @Override            public void onChange(boolean selfChange) {//                super.onChange(selfChange);                boolean downloading = true;                while(downloading){                    cursor = manager.query(query);                    try {                        if (cursor != null && cursor.moveToFirst()) {                            int bytes_downloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));                            int bytes_total = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));                            progress = (int) ((bytes_downloaded * 100) / bytes_total);                            mHandler.sendEmptyMessage(DOWNLOADING);                            if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))==DownloadManager.STATUS_SUCCESSFUL) {                                mHandler.sendEmptyMessage(DOWNLOADED);                            }else if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))==DownloadManager.STATUS_FAILED){                                mHandler.sendEmptyMessage(DOWNLOAD_FAILED);                            }                        }                    }catch (Exception e){                        e.printStackTrace();                        mHandler.sendEmptyMessage(DOWNLOAD_FAILED);                    }finally {                        if (cursor != null){                            downloading = false;                            cursor.close();                        }                    }                }            }        };        mContext.getContentResolver().registerContentObserver(Uri.parse("content://downloads/"),true,contentObserver);    }    /** 更新UI的handler */    private Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            // TODO Auto-generated method stub            switch (msg.what) {                case DOWNLOADING:                    mProgress.setProgress(progress);                    break;                case DOWNLOADED:                    if (alertDialog2 != null)                        alertDialog2.dismiss();                    installAPK();                    break;                case DOWNLOAD_FAILED:                    ToastUtil.getInstance(mContext,"网络断开，请稍候再试",false).show();                    break;                default:                    break;            }        }    };    /** 下载完成后自动安装apk */    public void installAPK() {        File apkFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),"liuliu-dashou-app-"+mVersionBean.getLastVersion() + ".apk");        if (!apkFile.exists()) {            return;        }        if (Build.VERSION.SDK_INT>=24){                     Uri apkUri = FileProvider.getUriForFile(mContext, LiuLiuApplication.getContext().getPackageName()+".fileprovider", apkFile);            Intent install = new Intent(Intent.ACTION_VIEW);            install.addCategory(Intent.CATEGORY_DEFAULT);            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);            install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);            install.setDataAndType(apkUri, "application/vnd.android.package-archive");            mContext.startActivity(install);        } else {            Intent intent = new Intent();            intent.setAction(Intent.ACTION_VIEW);            intent.addCategory(Intent.CATEGORY_DEFAULT);            intent.setType("application/vnd.android.package-archive");            intent.setData(Uri.fromFile(apkFile));            intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);            mContext.startActivity(intent);        }    }}