Android 使用SharedReferences保存切换按钮的状态

我见过其他类似的问题，但都没有解决！我有一个开关按钮。我想保存ToggleButton的状态（选中true或false），即使在应用程序关闭/重新打开时也是如此

我的代码如下所示，但它不会运行

公共类MainActivity扩展了AppCompatActivity{

    ToggleButton toggle1 = (ToggleButton) findViewById(R.id.toggle1);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
private void savePreference(Context context)
{
    SharedPreferences.Editor editor = context.getSharedPreferences("toggleState1", 0).edit();
    editor.putBoolean("toggleState1", toggle1.isChecked());
    editor.commit();
}

private void loadPreference (Context context)
{
    SharedPreferences prefs = context.getSharedPreferences("toggleState1", 0);
    toggle1.setChecked(prefs.getBoolean("toggleState1", false));
}};

private static final String APP_SHARED_PREFERENCE_NAME = "AppSharedPref";
private final static String TOGGLE_STATE_KEY1 = "TB_KEY1";
ToggleButton toggle1;
SharedPreferences sharedPreferences;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    sharedPreferences = getSharedPreferences(APP_SHARED_PREFERENCE_NAME, Context.MODE_PRIVATE);
    toggle1 = (ToggleButton) findViewById(R.id.toggle1);
    toggle1.setChecked(GetState());
    toggle1.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
            SaveState(isChecked);
        }
    });
}

private void SaveState(boolean isChecked) {
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putBoolean(TOGGLE_STATE_KEY1, isChecked);
    editor.commit();
}

public boolean GetState() {
    return sharedPreferences.getBoolean(TOGGLE_STATE_KEY1, false);
}

谢谢你的帮助

ToggleButton toggle1 = (ToggleButton) findViewById(R.id.toggle1);

应该在

onCreate（）

中，使其成为最后一条语句

而且，它更容易使用

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);

应该在

onCreate（）

中，使其成为最后一条语句

而且，它更容易使用

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);

---

好的，我有答案供将来参考。我最初的尝试没有正确使用共享首选项。您必须为共享首选项对象创建一个“键”和一个“名称”。然后在代码中调用它，如下所示：

公共类MainActivity扩展了AppCompatActivity{

    ToggleButton toggle1 = (ToggleButton) findViewById(R.id.toggle1);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
private void savePreference(Context context)
{
    SharedPreferences.Editor editor = context.getSharedPreferences("toggleState1", 0).edit();
    editor.putBoolean("toggleState1", toggle1.isChecked());
    editor.commit();
}

private void loadPreference (Context context)
{
    SharedPreferences prefs = context.getSharedPreferences("toggleState1", 0);
    toggle1.setChecked(prefs.getBoolean("toggleState1", false));
}};

private static final String APP_SHARED_PREFERENCE_NAME = "AppSharedPref";
private final static String TOGGLE_STATE_KEY1 = "TB_KEY1";
ToggleButton toggle1;
SharedPreferences sharedPreferences;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    sharedPreferences = getSharedPreferences(APP_SHARED_PREFERENCE_NAME, Context.MODE_PRIVATE);
    toggle1 = (ToggleButton) findViewById(R.id.toggle1);
    toggle1.setChecked(GetState());
    toggle1.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
            SaveState(isChecked);
        }
    });
}

private void SaveState(boolean isChecked) {
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putBoolean(TOGGLE_STATE_KEY1, isChecked);
    editor.commit();
}

public boolean GetState() {
    return sharedPreferences.getBoolean(TOGGLE_STATE_KEY1, false);
}

---

}

好的，我有答案供将来参考。我最初的尝试没有正确使用共享首选项。您必须为共享首选项对象创建一个“键”和一个“名称”。然后在代码中调用它，如下所示：

公共类MainActivity扩展了AppCompatActivity{

    ToggleButton toggle1 = (ToggleButton) findViewById(R.id.toggle1);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
private void savePreference(Context context)
{
    SharedPreferences.Editor editor = context.getSharedPreferences("toggleState1", 0).edit();
    editor.putBoolean("toggleState1", toggle1.isChecked());
    editor.commit();
}

private void loadPreference (Context context)
{
    SharedPreferences prefs = context.getSharedPreferences("toggleState1", 0);
    toggle1.setChecked(prefs.getBoolean("toggleState1", false));
}};

private static final String APP_SHARED_PREFERENCE_NAME = "AppSharedPref";
private final static String TOGGLE_STATE_KEY1 = "TB_KEY1";
ToggleButton toggle1;
SharedPreferences sharedPreferences;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    sharedPreferences = getSharedPreferences(APP_SHARED_PREFERENCE_NAME, Context.MODE_PRIVATE);
    toggle1 = (ToggleButton) findViewById(R.id.toggle1);
    toggle1.setChecked(GetState());
    toggle1.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
            SaveState(isChecked);
        }
    });
}

private void SaveState(boolean isChecked) {
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putBoolean(TOGGLE_STATE_KEY1, isChecked);
    editor.commit();
}

public boolean GetState() {
    return sharedPreferences.getBoolean(TOGGLE_STATE_KEY1, false);
}

---

}

非常好，我在loadPreference方法结束后将其放在onCreate中。它仍然不起作用…还有其他想法吗？非常好，我在loadPreference方法结束后将其放在onCreate中。它仍然不起作用…还有其他想法吗？