Android7.0 用第三方软件打开文件

Android7.0 加强了对文件的访问权限,访问文件必须使用fileProvider使用第三方软件打开。

<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="com.example.ms.xx.master.fileProvider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

res的xml资源目录添加file_paths.xml文件

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

获取文件类型和获取文件地址

//{后缀名， MIME类型}
    private static final String[][] MIME_MapTable = {
            {".3gp", "video/3gpp"},
            {".apk", "application/vnd.android.package-archive"},
            {".asf", "video/x-ms-asf"},
            {".avi", "video/x-msvideo"},
            {".bin", "application/octet-stream"},
            {".bmp", "image/bmp"},
            {".c", "text/plain"},
            {".class", "application/octet-stream"},
            {".conf", "text/plain"},
            {".cpp", "text/plain"},
            {".doc", "application/msword"},
            {".exe", "application/octet-stream"},
            {".gif", "image/gif"},
            {".gtar", "application/x-gtar"},
            {".gz", "application/x-gzip"},
            {".h", "text/plain"},
            {".htm", "text/html"},
            {".html", "text/html"},
            {".jar", "application/java-archive"},
            {".java", "text/plain"},
            {".jpeg", "image/jpeg"},
            {".jpg", "image/jpeg"},
            {".js", "application/x-javascript"},
            {".log", "text/plain"},
            {".m3u", "audio/x-mpegurl"},
            {".m4a", "audio/mp4a-latm"},
            {".m4b", "audio/mp4a-latm"},
            {".m4p", "audio/mp4a-latm"},
            {".m4u", "video/vnd.mpegurl"},
            {".m4v", "video/x-m4v"},
            {".mov", "video/quicktime"},
            {".mp2", "audio/x-mpeg"},
            {".mp3", "audio/x-mpeg"},
            {".mp4", "video/mp4"},
            {".mpc", "application/vnd.mpohun.certificate"},
            {".mpe", "video/mpeg"},
            {".mpeg", "video/mpeg"},
            {".mpg", "video/mpeg"},
            {".mpg4", "video/mp4"},
            {".mpga", "audio/mpeg"},
            {".msg", "application/vnd.ms-outlook"},
            {".ogg", "audio/ogg"},
            {".pdf", "application/pdf"},
            {".png", "image/png"},
            {".pps", "application/vnd.ms-powerpoint"},
            {".ppt", "application/vnd.ms-powerpoint"},
            {".prop", "text/plain"},
            {".rar", "application/x-rar-compressed"},
            {".rc", "text/plain"},
            {".rmvb", "audio/x-pn-realaudio"},
            {".rtf", "application/rtf"},
            {".sh", "text/plain"},
            {".tar", "application/x-tar"},
            {".tgz", "application/x-compressed"},
            {".txt", "text/*"},
            {".wav", "audio/x-wav"},
            {".wma", "audio/x-ms-wma"},
            {".wmv", "audio/x-ms-wmv"},
            {".wps", "application/vnd.ms-works"},
            {".xml", "text/xml"},
            {".xml", "text/plain"},
            {".z", "application/x-compress"},
            {".zip", "application/zip"},
            {"", "*/*"}
    };

    public static String getMIMEType(File file) {
        String type = "*/*";
        String fName = file.getName();
        //获取后缀名前的分隔符"."在fName中的位置。
        int dotIndex = fName.lastIndexOf(".");
        if (dotIndex < 0) {
            return type;
        }
        /* 获取文件的后缀名 */
        String fileType = fName.substring(dotIndex, fName.length()).toLowerCase();
        if ("".equals(fileType)) {
            return type;
        }
        //在MIME和文件类型的匹配表中找到对应的MIME类型。
        for (int i = 0; i < MIME_MapTable.length; i++) {
            if (fileType.equals(MIME_MapTable[i][0]))
                type = MIME_MapTable[i][1];
        }
        return type;
    }

    public static Uri getUri(Context context, String authorites, File file) {
        Uri uri;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            //设置7.0以上共享文件，分享路径定义在xml/file_paths.xml
            uri = FileProvider.getUriForFile(context, authorites, file);
        } else {
            // 7.0以下,共享文件
            uri = Uri.fromFile(file);
        }
        return uri;
    }

    /**
     * 打开文件目录
     * @param context
     */
    public static void openFileActivity(Context context,String filePath){
        try {
            File file = new File(filePath);
            Intent intent = new Intent();
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//设置标记
            intent.setAction(Intent.ACTION_VIEW);//动作，查看
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(getUri(context, BuildConfig.APPLICATION_ID +".provider",file), getMIMEType(file));//设置类型
            context.startActivity(intent);
        } catch (Exception e) {
            Log.e("openCameraActivity","打开文件失败", e);
        }
    }

但在使用时 会出现问题 比如找不到文件 修改文件后 需要不能本目录保存。

网上找了个方法

public static void openFileEx(String filePath, String fileType, Context context) {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    // 判断版本大于等于7.0
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder.build());
    }
    Uri data = Uri.fromFile(new File(filePath));
    intent.setDataAndType(data, getMap(fileType));
    Toast.makeText(context, "uri:" + data.toString(), Toast.LENGTH_SHORT).show();
    context.startActivity(intent);
}