问 Android请求运行时权限不起作用

EN

这是因为 ActivityCompat.requestPermissions 不是同步调用。操作系统将显示弹出窗口(实际上是一个活动)，随后的语句将被执行。

因为这两个权限对于您同时请求它们是强制的。

 if (!checkPermission(readPermission) || !checkPermission(writePermission)) {
        requestPermission(new String[] {readPermission,writePermission});        
  } else{
    //Run Async task directly since the permissions are already granted
private void requestPermission(String[] permissions){
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, permissions[0])||ActivityCompat.shouldShowRequestPermissionRationale(this, permissions[1])){
        Toast.makeText(getApplicationContext(), "Read/Write external storage permission allows us to read/write data. Please allow in App Settings for additional functionality.",Toast.LENGTH_LONG).show();
    ActivityCompat.requestPermissions(this, permissions,PERMISSION_REQUEST_CODE);
}

ActivityCompat.requestPermissions(this，permissions，requestCode)；

将 AsyncTask 执行移到 onRequestPermissionsResult ，如下所示：

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case PERMISSION_REQUEST_CODE:
            if (verifyGrantResults(grantResults)) {
                Toast.makeText(getApplicationContext(), "Permission Granted. Now you can read/write data.",
                        Toast.LENGTH_LONG).show();
                        //start Async Task here
            } else {
                Toast.makeText(getApplicationContext(),"Permission Denied. You cannot read/write data.",
                        Toast.LENGTH_LONG).show();
            break;
private boolean verifyGrantResults(final int[] grantResults) {
        boolean permissionsGranted = true;
        if (grantResults.length > 0) {
            for (int result : grantResults) {
                if (result == PackageManager.PERMISSION_DENIED) {
                    permissionsGranted = false;