我的android设置有问题。我想创建用于更改活动背景颜色的设置。我该怎么办?
我有布局:
public class MyApp extends PreferenceActivity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void display(View view)
{
Intent intent = new Intent(this, Display.class);
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu, menu);
return true;
}
public boolean onOptionsItemSelected( MenuItem item)
{
switch (item.getItemId())
{
case R.id.menu_about:
Intent menu_about = new Intent(this, About.class);
startActivity(menu_about);
return true;
case R.id.menu_copyright:
Intent menu_copyright = new Intent(this, Copyright.class);
startActivity(menu_copyright);
return true;
case R.id.menu_settings:
// ACTIVITY OF SETTINGS
return true;
case R.id.menu_exit:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
};
}
我想要这样的偏好:
http://i.stack.imgur.com/k2qA5.png
现在,你有没有想过我?
答案 0 :(得分:1)
以这种方式创建SharedPreferences
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("PrefName", VALUE);
editor.commit();
以这种方式获取其价值
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
String s = settings.getString("PrefName", ""));
最后一个语句表示您正在寻找“PrefName”的值,如果找不到任何内容则设置“”。
希望有所帮助
答案 1 :(得分:1)
menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/settings"
android:title="Settings"
>
<menu>
<item android:id="@+id/red"
android:title="Red" />
<item android:id="@+id/Blue"
android:title="Blue" />
</menu>
</item>
</menu>
<强> AndroidMenusActivity.java 强>
public class AndroidMenusActivity extends Activity {
LinearLayout li;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
li= findViewById(R.id.layoutid);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.layout.menu, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.red:
li.setBackgroundColor("#ff0000");
break;
case R.id.blue:
li.setBackgroundColor("#0000ff");
break;
}
}
}
<强> main.xml中强>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layoutid"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</LinearLayout>
答案 2 :(得分:0)
您的意思是改变XML文件的活动背景吗?
机器人:背景= “@机器人:颜色/ XXXXX”
选择一种列出的颜色。