如何解决如何在运行时更改android应用程序主题?
我正在尝试在运行时更改应用主题
我有ChangeTheme类和Utility(SharedPreferences)类
ChangeTheme.java
public class ChangeTheme extends AppCompatActivity {
private final static int THEME_LIGHT = 1;
private final static int THEME_DARK = 2;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.change_theme_activity);
updateTheme();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.myoptions,menu);
return true;
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.theme:
Intent toChangeTheme = new Intent(ChangeTheme.this,ChangeTheme.class);
startActivity(toChangeTheme);
}
return true;
}
public void onRadioButtonClicked(View view) {
// Is the button now checked?
boolean checked = ((RadioButton) view).isChecked();
// Check which radio button was clicked
switch(view.getId()) {
case R.id.lightTheme:
if (checked){
setTheme(R.style.AppTheme);
}
break;
case R.id.darkTheme:
if (checked){
setTheme(R.style.AppThemeDark);
}
break;
}
}
public void updateTheme() {
if (Utility.getTheme(getApplicationContext()) <= THEME_LIGHT) {
setTheme(R.style.AppTheme);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(getResources().getColor(R.color.colorPrimary));
}
} else if (Utility.getTheme(getApplicationContext()) == THEME_DARK) {
setTheme(R.style.AppThemeDark);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(getResources().getColor(R.color.colorSecondary));
}
}
}
}
change_theme_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="12dp"
android:paddingLeft="8dp"
android:paddingRight="8dp">
<TextView
android:id="@+id/textTheme"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Change Theme To:"
android:layout_marginTop="125dp">
</TextView>
<RadioGroup
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="20dp">
<RadioButton
android:id="@+id/lightTheme"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Light Theme"
android:onClick="onRadioButtonClicked"/>
<RadioButton
android:id="@+id/darkTheme"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dark Theme"
android:onClick="onRadioButtonClicked"/>
</RadioGroup>
</LinearLayout>
Utility.java
public class Utility {
public static void setTheme(Context context,int theme) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
prefs.edit().putInt(context.getString(R.string.prefs_theme_key),theme).apply();
}
public static int getTheme(Context context) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
return prefs.getInt(context.getString(R.string.prefs_theme_key),-1);
}
}
styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="AppThemeDark" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorSecondary</item>
<item name="colorPrimaryDark">@color/colorSecondaryDark</item>
<item name="colorAccent">@color/colorSecondaryAccent</item>
</style>
</resources>
当我单击按钮更改主题时,什么也没发生,为什么? 你能帮助我吗? 我已经检查过类似的问题,但无济于事
更新2020/09/08
ChangeTheme.java
public class ChangeTheme extends AppCompatActivity {
private final static int THEME_LIGHT = 1;
private final static int THEME_DARK = 2;
private RadioButton lightThemeButton;
private RadioButton darkThemeButton;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.change_theme_activity);
lightThemeButton = (RadioButton) findViewById(R.id.lightTheme);
darkThemeButton = (RadioButton) findViewById(R.id.darkTheme);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.myoptions,ChangeTheme.class);
startActivity(toChangeTheme);
}
return true;
}
public void onRadioButtonClicked(View view) {
// Is the button now checked?
boolean checked = ((RadioButton) view).isChecked();
// Check which radio button was clicked
switch(view.getId()) {
case R.id.lightTheme:
if (checked){
Utility.changeToTheme(this,Utility.THEME_LIGHT);
}
break;
case R.id.darkTheme:
if (checked){
Utility.changeToTheme(this,Utility.THEME_DARK);
}
break;
}
}
}
Utility.java
public class Utility {
private static int sTheme;
public final static int THEME_LIGHT = 0;
public final static int THEME_DARK = 1;
//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();
activity.startActivity(new Intent(activity,activity.getClass()));
}
//Set the theme of the activity,according to the configuration. */
public static void onActivityCreateSetTheme(Activity activity)
{
switch (sTheme)
{
default:
case THEME_LIGHT:
activity.setTheme(R.style.AppTheme);
break;
case THEME_DARK:
activity.setTheme(R.style.DarkTheme);
break;
}
}
}
styles.xml
<color name="color_primary_grey">#212121</color>
<color name="color_primary_black">#000000</color>
<color name="color_accent_white">#aeaeae</color>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="DarkTheme" parent="AppTheme">
<item name="colorPrimary">@color/color_primary_grey</item>
<item name="colorPrimaryDark">@color/color_primary_black</item>
<item name="colorAccent">@color/color_accent_white</item>
</style>
我现在要做什么才能在运行时更改主题?
解决方法
我以前是为了申请我的。
对于我的解决方案,我遵循了this guide中介绍的方法。
以下是要采取的步骤:
- 在共享首选项中保留主题的名称(或ID)。您已经做到了
- 在您活动的onCreate方法中,获取主题的字符串/ ID(以样式定义),该主题的字符串/ ID应该如下所示应用:
// inside activities onCreate method
// Within your switch command each case should look like this
theme.applyStyle(R.style.AppColorsDefault,true) // in Java it should be getTheme()
// for other cases just replace the style
theme.applyStyle(R.style.AppColorsDark,true) // true forces overwriting attributes that are -potentially - defined by your AppTheme
- 重新启动活动以进行更改(只能在onCreate方法中设置主题,因此您需要重新启动活动)
val intent = requireActivity().intent // use Intent intent = getActivity().getIntent() in Java
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION)
requireActivity().finish() // use getActivity() again
startActivity(intent)
在我的解决方案中,您也不需要继承主题。应用的样式仅需要包含更改。 这里是一个例子:
styles.xml
<resources>
<!-- Base application theme.
Also consider using a Material Theme
Theme.MaterialComponents.Light.DarkActionBar
-->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<!-- put all the attributes here that should be applied to the app independent from the applied colors -->
</style>
<style name="AppColorsDefault">
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="AppColorsDark">
<item name="colorPrimary">@color/colorSecondary</item>
<item name="colorPrimaryDark">@color/colorSecondaryDark</item>
<item name="colorAccent">@color/colorSecondaryAccent</item>
</style>
</resources>
如果您的应用程序具有多个活动,并且您希望将更改后的样式(例如颜色)应用于所有这些活动:
只需创建BaseActivity
的{{1}},然后让您的所有活动扩展此extends AppCompatActivity
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