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>