Android Them+SharedPreferences 修改程序所有view字体颜色、大小和页面背景
有这么一个需求,可以对页面的样式进行选择,然后根据选择改变程序所有字体颜色和页面背景。同时下一次启动程序,当前设置依然有效。
根据需求,我们需要一种快速,方便,有效的方式来实现需求,然后可以通过Android Them + SharedPreferences 来实现需求。Them用于存放设置的每一种样式,并应用于程序中,SharedPreferences用于记住程序当前的样式,根据SharedPreferences的内容来设置程序的样式,实现下次启动能够oncreat当前的样式设置。
这里的Them比较简单,只是定义了字体颜色和页面背景颜色。在res/values/styles.xml 文件中增加Them主题
<style name="FirstThem"> <item name="android:textColor">@color/FirstThemTextColor</item> <!-- 字体颜色 --> <item name="android:windowBackground">@color/FirstThemBackgroundColor</item> <!-- 窗口背景 --> </style> <style name="SecondThem"> <item name="android:textColor">@color/SecondThemTextColor</item> <!-- 字体颜色 --> <item name="android:windowBackground">@color/SecondThemBackgroundColor</item> <!-- 窗口背景 --> </style> <style name="ThirdThem"> <item name="android:textColor">@color/ThirdThemTextColor</item> <!-- 字体颜色 --> <item name="android:windowBackground">@color/ThirdThemBackgroundColor</item> <!-- 窗口背景 --> </style>
然后在MainActivity.java中创建SharedPreferences来记录样式的状态
private void SharePreference() { sharePrefences=this.getSharedPreferences("config",Context.MODE_WORLD_READABLE | Context.MODE_WORLD_WRITEABLE); editor=sharePrefences.edit(); boolean isThem = sharePrefences.getBoolean("isThem", false); int Them = sharePrefences.getInt("Them",0);//config不存在时返回0 if(isThem){ if(Them==1){ setTheme(R.style.FirstThem); }else if(Them==2){ setTheme(R.style.SecondThem); }else if(Them==3){ setTheme(R.style.ThirdThem); } }else{//sharePrefences不存在是使用默认主题 setTheme(R.style.FirstThem); } }
有两个比较值得注意的地方是:
1、设置主题时,setTheme(R.style.FirstThem);一定要放在setContentView(R.layout.activity_main);前,否则无效。
setTheme(R.style.FirstThem);
setContentView(R.layout.activity_main);
2、要所有页面的字体颜色和背景能够根据Them去改变,那么布局文件中的目标控件都不能设置android:textcolor,以及android:background.否则控件的android:textcolor,android:background属性会将Them的设置覆盖。
下面是一个demo的完整代码:
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/FirstThem" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="样式一" /> <Button android:id="@+id/SecondThem" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="样式二" /> <Button android:id="@+id/ThirdThem" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="样式三" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_marginTop="50dp" android:textSize="30sp" android:text="ABCDEFG" /> </LinearLayout>
MainActivity.java
public class MainActivity extends Activity implements OnClickListener { private Button FirstThemButton; private Button SecondThemButton; private Button ThirdThemButton; private SharedPreferences sharePrefences; private Editor editor; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); SharePreference(); setContentView(R.layout.activity_main); InitView(); FirstThemButton=(Button) findViewById(R.id.FirstThem); SecondThemButton=(Button) findViewById(R.id.SecondThem); SecondThemButton=(Button) findViewById(R.id.ThirdThem); } private void SharePreference() { sharePrefences=this.getSharedPreferences("config",Context.MODE_WORLD_READABLE | Context.MODE_WORLD_WRITEABLE); editor=sharePrefences.edit(); boolean isThem = sharePrefences.getBoolean("isThem", false); int Them = sharePrefences.getInt("Them",0);//config不存在时返回0 if(isThem){ if(Them==1){ setTheme(R.style.FirstThem); }else if(Them==2){ setTheme(R.style.SecondThem); }else if(Them==3){ setTheme(R.style.ThirdThem); } }else{//sharePrefences不存在是使用默认主题 setTheme(R.style.FirstThem); } } private void InitView() { FirstThemButton=(Button) findViewById(R.id.FirstThem); SecondThemButton=(Button) findViewById(R.id.SecondThem); ThirdThemButton=(Button) findViewById(R.id.ThirdThem); FirstThemButton.setOnClickListener(this); SecondThemButton.setOnClickListener(this); ThirdThemButton.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.FirstThem: editor.putBoolean("isThem", true); editor.putInt("Them", 1); editor.commit(); Intent intent1=new Intent(this,MainActivity.class); startActivity(intent1); break; case R.id.SecondThem: editor.putBoolean("isThem", true); editor.putInt("Them",2); editor.commit(); Intent intent2=new Intent(this,MainActivity.class); startActivity(intent2); break; case R.id.ThirdThem: editor.putBoolean("isThem", true); editor.putInt("Them", 3); editor.commit(); Intent intent3=new Intent(this,MainActivity.class); startActivity(intent3); break; default: break; } } }
styles.xml
<resources> <!-- Base application theme, dependent on API level. This theme is replaced by AppBaseTheme from res/values-vXX/styles.xml on newer devices. --> <style name="AppBaseTheme" parent="Theme.AppCompat.Light"> <!-- Theme customizations available in newer API levels can go in res/values-vXX/styles.xml, while customizations related to backward-compatibility can go here. --> </style> <!-- Application theme. --> <style name="AppTheme" parent="AppBaseTheme"> <!-- All customizations that are NOT specific to a particular API-level can go here. --> </style> <style name="FirstThem"> <item name="android:textColor">@color/FirstThemTextColor</item> <!-- 字体颜色 --> <item name="android:windowBackground">@color/FirstThemBackgroundColor</item> <!-- 窗口背景 --> </style> <style name="SecondThem"> <item name="android:textColor">@color/SecondThemTextColor</item> <!-- 字体颜色 --> <item name="android:windowBackground">@color/SecondThemBackgroundColor</item> <!-- 窗口背景 --> </style> <style name="ThirdThem"> <item name="android:textColor">@color/ThirdThemTextColor</item> <!-- 字体颜色 --> <item name="android:windowBackground">@color/ThirdThemBackgroundColor</item> <!-- 窗口背景 --> </style> </resources>
colors.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <color name="FirstThemTextColor">#000000</color> <color name="FirstThemBackgroundColor">#FFFFFF</color> <color name="SecondThemTextColor">#AAAAAA</color> <color name="SecondThemBackgroundColor">#EEBBEE</color> <color name="ThirdThemTextColor">#CCCCCC</color> <color name="ThirdThemBackgroundColor">#AAAADD</color> </resources>
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