Android开发实现切换主题及换肤功能示例

public class ColorTheme {
  AppCompatActivity ap;
  public ColorTheme(AppCompatActivity _ap){ap=_ap;}
  public void updateTheme(int _data){
    String data=Integer.toString(_data);
    FileOutputStream out=null;
    BufferedWriter writer=null;
    try{
      out=ap.openFileOutput("data",Context.MODE_PRIVATE);
      writer=new BufferedWriter(new OutputStreamWriter(out));
      writer.write(data);
    }catch (IOException e){
      e.printStackTrace();
    }finally {
      try {
        if(writer!=null){
          writer.close();
        }
      }catch (IOException e){
        e.printStackTrace();
      }
    }
  }
  public void loadTheme(){
    FileInputStream in=null;
    BufferedReader reader= null;
    StringBuilder content=new StringBuilder();
    try{
      in=ap.openFileInput("data");
      reader=new BufferedReader(new InputStreamReader(in));
      String line="";
      while((line=reader.readLine())!=null){
        content.append(line);
      }
      ap.setTheme(Integer.parseInt(content.toString()));
    }catch (IOException e){
      e.printStackTrace();
    }finally {
      if(reader!=null){
        try{
          reader.close();
        }catch (IOException e){
          e.printStackTrace();
        }
      }
    }
  }
}

protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  final ColorTheme newTheme = new ColorTheme(this);
  newTheme.loadTheme();
  setContentView(R.layout.activity_main);

<?xml version="1.0"? 
  <resources 
  <!-- Base application theme. -- 
  -<style parent="Theme.AppCompat.Light.NoActionBar" name="AppTheme" 
  <!-- Customize your theme here. -- 
  <item name="colorPrimary" @color/colorPrimary</item 
  <item name="colorPrimaryDark" @color/colorPrimaryDark</item 
  <item name="colorAccent" @color/colorAccent</item 
  <item name="colorButtonNormal" @color/colorAccent</item 
</style 
  -<style parent="Theme.AppCompat.Light.NoActionBar" name="Blue" 
  <!-- Customize your theme here. -- 
  <item name="colorPrimary" @color/blue</item 
  <item name="colorPrimaryDark" @color/blue</item 
  <item name="colorAccent" @color/blue</item 
  <item name="colorButtonNormal" @color/blue</item 
</style 
  -<style parent="Theme.AppCompat.Light.NoActionBar" name="Pink" 
  <!-- Customize your theme here. -- 
  <item name="colorPrimary" @color/pink</item 
  <item name="colorPrimaryDark" @color/pink</item 
  <item name="colorAccent" @color/pink</item 
  <item name="colorButtonNormal" @color/pink</item 
</style 
  -<style parent="Theme.AppCompat.Light.NoActionBar" name="Turquoise" 
  <!-- Customize your theme here. -- 
  <item name="colorPrimary" @color/turquoise</item 
  <item name="colorPrimaryDark" @color/turquoise</item 
  <item name="colorAccent" @color/turquoise</item 
  <item name="colorButtonNormal" @color/turquoise</item 
</style 
</resources 

<?xml version="1.0" encoding="UTF-8"? 
  <resources 
  <color name="colorText" #ffffffff</color 
  <color name="hintText" #bfffffff</color 
  <color name="colorPrimary" #de4037</color 
  <color name="colorPrimaryDark" #de4037</color 
  <color name="colorAccent" #de4037</color 
  <!--注册界面提示红色-- 
  <color name="hintRed" #de4037</color 
  <color name="blue" #1e50a2</color 
  <color name="pink" #fa7299</color 
  <color name="turquoise" #008577</color 
</resources