java - Android 应用程序在加载 SharedPreferences 时崩溃 'getBoolean'

Question

我想保存我的游戏设置(bgMusic、声音和振动)，但在加载应用程序时启动时崩溃。代码是:

private SharedPreferences preferences;
private SharedPreferences.Editor editor;
private boolean bgMusicToggleState, soundToggleState, vibratorToggleState;
...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...

    dialog = new Dialog(this, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen);
    dialog.getWindow().getDecorView().setSystemUiVisibility(
            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);

    dialog.setContentView(R.layout.pause_dialog);
    dialog.hide();
    initDialog();

    this.preferences = this.getSharedPreferences(GAME_NAME, MODE_PRIVATE);
    this.editor = preferences.edit();
    ...

}
...
public void saveMusicSettings(){
    editor.putBoolean("bgMusicToggleState", bgmusic_toggle.isChecked());
    editor.commit();
}
public void saveVibratorSettings(){
    editor.putBoolean("vibratorToggleState", vibrateToggle.isChecked());
    editor.commit();
}

public void saveSoundSettings(){
    editor.putBoolean("soundToggleState", sounds_toggle.isChecked());
    editor.commit();
}
...
private void initDialog(){
/// The App crashes here
    bgMusicToggleState = preferences.getBoolean("bgMusicToggleState", false);


    continue_Button = (Button) dialog.findViewById(R.id.continue_button);
    restart_Button = (Button) dialog.findViewById(R.id.restart_button);
    exit_Button = (Button) dialog.findViewById(R.id.exit_button);

    continue_Button.setOnClickListener(pauseClick);
    exit_Button.setOnClickListener(pauseClick);
    restart_Button.setOnClickListener(pauseClick);

    bgmusic_toggle = (ToggleButton) dialog.findViewById(R.id.backgroundsound_toggle);
    bgmusic_toggle.setChecked(bgMusicToggleState);
    bgmusic_toggle.setOnClickListener(toggleClickListener);

    sounds_toggle = (ToggleButton) dialog.findViewById(R.id.soundtoggle);
    sounds_toggle.setChecked(soundToggleState);
    sounds_toggle.setOnClickListener(toggleClickListener);

    vibrateToggle = (ToggleButton)dialog.findViewById(R.id.vibrate_toggle);
    vibrateToggle.setChecked(vibratorToggleState);
    vibrateToggle.setOnClickListener(toggleClickListener);


}

--> 保存设置在toggleClickListener中调用如果 preferenes 和编辑器在 initMethod 中，这没有什么区别......是不是 ToggleButtons 在对话框中，或者我必须在一种方法中执行此操作？我希望你可以帮助我。谢谢!

Answer 1

您必须在初始化 SharedPreference 对象之后调用 initDialog，而不是之前。变化

initDialog();
this.preferences = this.getSharedPreferences(GAME_NAME, MODE_PRIVATE);
this.editor = preferences.edit();

到

this.preferences = this.getSharedPreferences(GAME_NAME, MODE_PRIVATE);
this.editor = preferences.edit();
initDialog();