Question

好吧，我正在创建一个用于录制音频的应用程序，为此，我对该程序赋予了两个权限，使其可以完美运行。当用户获得许可时，我想播放和音频。但是我的代码在权限提示的同时播放音频。有人可以帮我吗？

这是我用于获取权限的功能：私人void requestPermission（）{

    ActivityCompat.requestPermissions(MainActivity.this, new String[]{WRITE_EXTERNAL_STORAGE, RECORD_AUDIO}, RequestPermissionCode);

}

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case RequestPermissionCode:
            if (grantResults.length > 0) {

                boolean StoragePermission = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                boolean RecordPermission = grantResults[1] == PackageManager.PERMISSION_GRANTED;

                if (StoragePermission && RecordPermission) {

                    Toast.makeText(MainActivity.this, "Permission Granted", Toast.LENGTH_LONG).show();
                }
                else {
                    Toast.makeText(MainActivity.this,"Permission Denied",Toast.LENGTH_LONG).show();

                }
            }

            break;
    }
}

public boolean checkPermission() {

    int result = ContextCompat.checkSelfPermission(getApplicationContext(), WRITE_EXTERNAL_STORAGE);
    int result1 = ContextCompat.checkSelfPermission(getApplicationContext(), RECORD_AUDIO);

    return result == PackageManager.PERMISSION_GRANTED && result1 == PackageManager.PERMISSION_GRANTED;
}

在这里我使用这些功能并播放音频：

if（！checkPermission（））{

        requestPermission();

        try {
            Thread.sleep(4000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        if (isFirstRun) {

            MediaPlayer mediaPlayer1 = MediaPlayer.create(this, R.raw.instruction);

            mediaPlayer1.start();
           // Toast.makeText(MainActivity.this, "First run", Toast.LENGTH_LONG).show();
            getSharedPreferences("Preference", MODE_PRIVATE).edit().putBoolean("isFirstRun", false).apply();

        }

Answer 1

您执行2个异步任务：requestPermission（）并播放音频。不要将代码与Thread.sleep（）同步。

if(!checkPermission()){
    //it is async call, you never know when result come.
    requestPermission();
}

@Override
public void onRequestPermissionsResult(
        final int requestCode,
        @NonNull final String[] permissions,
        @NonNull final int[] grantResults
) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (permissionGranted()) {
        playMusic();
    }
}

有了这个方法，您不需要'isFirsRun'变量。

授予权限后如何启动应用程序？

1 个答案: