java - 在继续之前检查是否授予了在存储上写入的权限

Question

我的应用程序出现问题。要使用选项，我需要授予外部存储访问权限。我在那里找到了完美的代码:

public  boolean isStoragePermissionGranted() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
            == PackageManager.PERMISSION_GRANTED) {
        Log.v(TAG,"Permission is granted");
        return true;
    } else {

        Log.v(TAG,"Permission is revoked");
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        return false;
    }
}
else { //permission is automatically granted on sdk<23 upon installation
    Log.v(TAG,"Permission is granted");
    return true;
}

}

来源:Storage permission error in Marshmallow

问题是，代码工作正常，但我不明白如果未授予访问权限(或等待用户单击“允许”，然后再继续我的代码)，如何阻止我自己的代码继续。

我的代码:

isStoragePermissionGranted();
        File outputFile = new File("");
            InputStream is = getResources().openRawResource(((Sound) adapter.getItem(index)).getMpsound());
            try {
                byte[] buffer = new byte[is.available()];
                is.read(buffer);
                File outputDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
                outputFile = new File(outputDir, getResources().getResourceEntryName(((Sound) adapter.getItem(index)).getMpsound()) + ".mp3");
                OutputStream os = new FileOutputStream(outputFile);
                os.write(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            Intent share = new Intent(Intent.ACTION_SEND);
            share.setType("audio/*");
            share.putExtra(Intent.EXTRA_STREAM, FileProvider.getUriForFile(this, BuildConfig.APPLICATION_ID + ".provider", outputFile));
            share.putExtra(Intent.EXTRA_TEXT, "\"" + ((Sound) adapter.getItem(index)).getTitre_show() + "\" shared by my app !");
            startActivity(Intent.createChooser(share, "Share Sound File"));
            return true;

目前，一切都已执行，即使未授予访问权限，应用程序也会尝试共享文件。所以这是行不通的。如果我返回，则会弹出请求允许访问的窗口，等待答案。

我怎样才能实现这个目标？

Answer 1

更改此行

isStoragePermissionGranted();

这应该可行。

if(isStoragePermissionGranted())