Question

最初，“启动”屏幕可以运行，但是当我添加更多代码（下面的代码中的if语句）时，它停止出现。

代码需要调用AsyncTask类。我尝试将if语句移到调用SQLiteHelper的AsncTask上。没用我读了一些与此有关的文章，发现其中无法从AsynTask调用SQLiteHelper。

在启动Splash期间，我需要下载一个不存在的文件，然后将其保存在SQLite中，最后从SQLIte获取文件的数据。

public class SplashActivity extends AppCompatActivity {

    String fileName = "movies.json";
    static String appName = "JSONApp";
    String path = getExternalStorageDirectory() + "/" + appName + "/" + fileName;
    ArrayList<Movie> moviesList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_splash);

        File file = new File(path);

        //checking if movies.json exists
        if (file.exists()) {
            Log.d(TAG, path + " exists");
            moviesList = new JsonToSQLiteHelper(this).getMovies();
            toMainActivity(moviesList);
        }
        else if (!shouldCheckPermission()) {
            Log.d(TAG, "The JSON file doesn't exists");

            Log.d("", "permission was already granted");
            moviesList = FromJsonToSQLite();
            toMainActivity(moviesList);
        } else {
            if (shouldCheckPermission()) {
                Log.d("", "Permission was checked.");
                requestPermissionAndContinue();
                Log.d("", "permission was denied");
            } else {
                Log.d("", "permission was denied and then given?");
                moviesList = FromJsonToSQLite();
                toMainActivity(moviesList);
            }
        }
    }

Answer 1

飞溅没有等待时间。因此，它将直接导航到主屏幕。您可以放置一个计时器并设置等待时间。如果您使用asynctask，请共享代码。

启动画面不出现

1 个答案: