功能:在开发播放/sdcard 下的视频文件,发现出现file not found 没有权限。
1.AndroidManifest.xml中添加权限
2.在onCreate()函数中调用权限申请
private String[] permissions = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.MANAGE_EXTERNAL_STORAGE}; private static final int OPEN_SET_REQUEST_CODE = 100;
//调用此方法判断是否拥有权限 private void initPermissions() { if (lacksPermission(permissions)) {//判断是否拥有权限 //请求权限,第二参数权限String数据,第三个参数是请求码便于在onRequestPermissionsResult 方法中根据code进行判断 ActivityCompat.requestPermissions(this, permissions, OPEN_SET_REQUEST_CODE); } } //如果返回true表示缺少权限 public boolean lacksPermission(String[] permissions) { for (String permission : permissions) { //判断是否缺少权限,true=缺少权限 if(ContextCompat.checkSelfPermission(getApplicationContext(), permission) != PackageManager.PERMISSION_GRANTED){ return true; } } return false; }
3.权限回调函数中执行
@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); switch (requestCode){//响应Code case OPEN_SET_REQUEST_CODE: if (grantResults.length > 0) { for(int i = 0; i < grantResults.length; i++){ if(grantResults[i] != PackageManager.PERMISSION_GRANTED){ //Toast.makeText(this,"未拥有相应权限"+grantResults[i],Toast.LENGTH_LONG).show(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) { if (!Environment.isExternalStorageManager()) { startActivityForResult(new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION), OPEN_SET_REQUEST_CODE); } } return; } } } break; } }
4.Androdi 11需要调用获取权限
startActivityForResult(new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION), OPEN_SET_REQUEST_CODE);
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