未在 Main Activity 上设置主题

Question

我正在尝试动态更改应用程序的主题。我有两项活动，一项是主要 activity，另一项是设置 activity。

在设置中activity我正在选择颜色时从颜色选择器对话框中更改主题，主题会更改。但是主题只是在设置 activity 上发生变化，而不是在主要 activity.

上发生变化

我尝试将颜色值从设置 activity 发送到主程序 activity，但应用程序无法启动。它只显示空白屏幕。

调试的时候才知道是先卡在了if(n==0){}，一直循环下去还没有结束

没明白是怎么回事。

也可能是主要的 activity 当我来自设置 activity 时没有刷新。如何刷新主 activity?

设置Activity：

public class Settings extends AppCompatActivity {

    int no;

    public static final String MyPREFERENCES = "MyPrefs" ;
    public static final int color = 0;
    public static final int color_2 = 0;
    public static final int color_3 = 0;
    SharedPreferences sharedpreferences;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        Theme.onActivityCreateSetTheme(this);

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);



        final ColorPickerDialog colorPickerDialog = new ColorPickerDialog();
        colorPickerDialog.initialize(R.string.dialog_title, new int[]{Color.CYAN, Color.LTGRAY, Color.BLACK, Color.BLUE, Color.GREEN, Color.MAGENTA, Color.RED, Color.GRAY, Color.YELLOW}, Color.YELLOW, 3, 2);
        colorPickerDialog.setOnColorSelectedListener(new ColorPickerSwatch.OnColorSelectedListener() {

            @Override
            public void onColorSelected(int color) {

                if (color == Color.CYAN) {
                    Theme.changeToTheme(Settings.this, Theme.THEME_DEFAULT);
                    no = 0;
                }
                else if (color == Color.LTGRAY)

                {
                    Theme.changeToTheme(Settings.this, Theme.THEME_WHITE);
                    no = 1;
                }
                else if (color == Color.BLACK) {

                    Theme.changeToTheme(Settings.this,Theme.THEME_BLUE);
                    no = 3;

                }
                Toast.makeText(Settings.this, "selectedColor : " + color, Toast.LENGTH_SHORT).show();
            }

        });

        SharedPreferences.Editor editor = sharedpreferences.edit();

        editor.putInt("color",no);
      //  editor.putInt("color_2",no);
      //  editor.putInt("color_3",no);
        editor.commit();

        LinearLayout theme = (LinearLayout)findViewById(R.id.theme);

        theme.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                colorPickerDialog.show(getSupportFragmentManager(), "colorpicker");
            }
        });
    }

}

主题：

    public class Theme {

    private static int sTheme;

    public final static int THEME_DEFAULT = 0;
    public final static int THEME_WHITE = 1;
    public final static int THEME_BLUE = 2;

    /** * Set the theme of the Activity, and restart it by creating a new Activity of the same type. */
    public static void changeToTheme(Activity activity, int theme) {
        sTheme = theme;
        activity.finish();
        Intent i = new Intent(activity,activity.getClass());
        activity.startActivity(i);
    }

    /** Set the theme of the activity, according to the configuration. */
    public static void onActivityCreateSetTheme(Activity activity) {
        switch (sTheme) {
            default:

            case THEME_DEFAULT:
                activity.setTheme(R.style.AppTheme);
                break;

            case THEME_WHITE:

                activity.setTheme(R.style.AppTheme_Solarized);
                break;

            case THEME_BLUE:

                activity.setTheme(R.style.BlueTheme);

                break;

        }
    }
}

主要Activity:

public class MainActivity extends AppCompatActivity {

private NavigationView navigationView;
private DrawerLayout drawerLayout;
Toolbar mToolbar;
private MainFragment mFragment;
private int no,no1,no2;

@Override
protected void onCreate(Bundle savedInstanceState) {

   SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", MODE_PRIVATE);
    SharedPreferences.Editor editor = pref.edit();


    no = pref.getInt("color",0);


    if(no == 0)
    {
        setTheme(R.style.AppTheme);
    }

    else if(no == 1)
    {
        setTheme(R.style.AppTheme_Solarized);
    }

    else if(no == 2)
    {
        setTheme(R.style.BlueTheme);
    }

   // Theme.onActivityCreateSetTheme(this);

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

谢谢。

Answer 1

在您的 Settings class 中，您正在将所选颜色写入 "MyPrefs" 首选项，但在您的 MainActivity 中，您正在从 "MyPref" 中读取（没有S) 偏好。

您已经有了 public 常量 MyPREFERENCES，也尝试在 MainActivity 中使用它。

未在 Main Activity 上设置主题

Theme not getting set on Main Activity

java

android

android-theme

android-activity