7.0 中Android加强了对文件的访问权限。
访问文件必须使用fileProvider
<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>
file_paths.xml
<paths> <external-path path="" name="external_storage_root" /> </paths>
fileType = fileType.toLowerCase(); Uri uri = null; try { Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { uri = FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID + ".fileProvider", new File(filePath)); }else { uri = Uri.fromFile(new File(filePath)); } intent.setDataAndType(uri, getMap(fileType)); context.startActivity(intent);
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); }
完美解决了上述的问题 。
ps:
public static String getMap(String key) { Map<String, String> map = new HashMap<String, String>(); map.put("rar", "application/x-rar-compressed"); map.put("jpg", "image/jpeg"); map.put("zip", "application/zip"); map.put("pdf", "application/pdf"); map.put("doc", "application/msword"); map.put("docx", "application/msword"); map.put("wps", "application/msword"); map.put("xls", "application/vnd.ms-excel"); map.put("et", "application/vnd.ms-excel"); map.put("xlsx", "application/vnd.ms-excel"); map.put("ppt", "application/vnd.ms-powerpoint"); map.put("html", "text/html"); map.put("htm", "text/html"); map.put("txt", "text/html"); map.put("mp3", "audio/mpeg"); map.put("mp4", "video/mp4"); map.put("3gp", "video/3gpp"); map.put("wav", "audio/x-wav"); map.put("avi", "video/x-msvideo"); map.put("flv", "flv-application/octet-stream"); map.put("", "*/*"); return map.get(key.toLowerCase()); }