[英]I could not find anywhere how to change color of background from item menu to all activities
我想创建类似主题的日夜更改。
这是代码:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId()==R.id.menu_svijetlaTema){
/**Set background color*/
View view = this.getWindow().getDecorView();
view.setBackgroundColor(Color.parseColor("#ffffff"));
String[] values = getResources().getStringArray(R.array.pitanja);
final ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_list_item_1, values){
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View a = super.getView(position, convertView, parent);
TextView boja = (TextView) a.findViewById(android.R.id.text1);
boja.setTextColor(Color.BLACK);
return a;
}
};
ListView listView = (ListView) findViewById(R.id.listView);
listView.setAdapter(adapter);
RelativeLayout layout = (RelativeLayout) findViewById(R.id.activity_second);
layout.setBackgroundColor(Color.WHITE);
} else if(item.getItemId()==R.id.menu_tamnaTema){
View view = this.getWindow().getDecorView();
view.setBackgroundColor(Color.parseColor("#4c635c"));
String[] values = getResources().getStringArray(R.array.pitanja);
final ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_list_item_1, values){
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View a = super.getView(position, convertView, parent);
TextView boja = (TextView) a.findViewById(android.R.id.text1);
boja.setTextColor(Color.WHITE);
return a;
}
};
ListView listView = (ListView) findViewById(R.id.listView);
listView.setAdapter(adapter);
RelativeLayout layout = (RelativeLayout) findViewById(R.id.activity_second);
layout.setBackgroundColor(Color.BLACK);
}
return true;
}`
之后,当我单击菜单应用程序中的项目崩溃时,适配器用于更改ListView
,但是RelativeLayout layout = (RelativeLayout) findViewById(R.id.activity_second); layout.setBackgroundColor(Color.WHITE);
RelativeLayout layout = (RelativeLayout) findViewById(R.id.activity_second); layout.setBackgroundColor(Color.WHITE);
无法正常工作,我正在尝试从MainActivity
菜单将背景颜色更改为MainActivity
和SecondActivity
。 这是错误:
---------崩溃开始E / AndroidRuntime:致命异常:main进程:hr.itot.vjezbaprvepomoci,PID:2538 java.lang.NullPointerException:尝试调用虚拟方法void
android.app.Activity.onMenuItemSelected(Activity.java:3204)上位于hr.itot.vjezbaprvepomoci.MainActivity.onOptionsItemSelected(MainActivity.java:605)上的null对象引用上的android.widget.RelativeLayout.setBackgroundColor(int)' .support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:406)位于android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195)位于android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper .java:103),位于android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:810),位于android.support.v7.app.AppCompatDelegateImplV9.onMenuItemSelected(AppCompatDelegateImplV9.java:667)。位于android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:957)的v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)处于android.support.v7.view.menu.MenuPopup处。 android.widget.AdapterView.performItemClick(AdapterView.jav)上的onItemClick(MenuPopup.java:127) a:310),位于android.widget.AbsListView.performItemClick(AbsListView.java:1155),位于android.widget.AbsListView $ PerformClick.run(AbsListView.java:3126),位于android.widget.AbsListView $ 3.run(AbsListView.java: 4041),位于android.os.Handler.dispatchMessage(Handler.java:95),位于android.os.Handler.dispatchMessage(Handler.java:95),位于android.os.Looper.loop(Looper.java:154)。 com的java.lang.reflect.Method.invoke(本机方法)处的app.ActivityThread.main(ActivityThread.java:6077)com.com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:865) android.internal.os.ZygoteInit.main(ZygoteInit.java:755)`
要更改溢出菜单背景,请将其添加到“活动”主题中
<item name="android:itemBackground">@color/overflow_background</item>
添加清单
<activity
android:name="com.alarm.main.MainActivity"
android:label="@string/app_name"
android:theme="@style/MyAppActionBarTheme" />
并在values文件夹中创建themes.xml并将其写下来
<resources>
<style name="MyAppActionBarTheme" parent="@android:style/Theme.Holo">
<item name="android:popupMenuStyle">@style/MyApp.PopupMenu</item>
<item name="android:itemTextAppearance">@style/TextAppearance</item>
</style>
<!-- The: background color for Action Bar overflow menu -->
<style name="MyApp.PopupMenu" parent="android:Widget.Holo.Light.ListPopupWindow">
<item name="android:popupBackground">#0b19ba</item>
</style>
<!-- Popup Menu Text Color styles -->
<style name="TextAppearance" parent="android:style/TextAppearance.Holo.Widget.ActionBar.Menu">
<item name="android:textColor">#ffffff</item>
</style>
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