Android应用动态修改主题的方法示例

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1.使用API设置主题

如下所示，在Activity中使用setTheme

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setTheme(R.style.MyTheme1);

2.调用API的时机

需要在super.onCreate(savedInstanceState)之前调用setTheme

3.重新设置主题

要重新设置主题，则需要结束Activity，重新启动才可以

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public class MainActivity extends Activity {
  private TextView tv;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_1_THEME_FLAG){
      setTheme(R.style.MyTheme2);
    }else if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_2_THEME_FLAG){
      setTheme(R.style.MyTheme1);
    }
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tv = findViewById(R.id.tv);
    getActionBar().show();
    getActionBar().setTitle("ActionBar Title");
    tv.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_1_THEME_FLAG){
          MyApplication.SHOW_THEME_FLAG = MyApplication.SHOW_2_THEME_FLAG;
        }else if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_2_THEME_FLAG){
          MyApplication.SHOW_THEME_FLAG = MyApplication.SHOW_1_THEME_FLAG;
        }
        Intent mIntent = getIntent();
        finish();
        overridePendingTransition(0,0);
        startActivity(mIntent);
      }
    });
  }
}

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public class MainActivity extends Activity {
  private TextView tv;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_1_THEME_FLAG){
      setTheme(R.style.MyTheme2);
    }else if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_2_THEME_FLAG){
      setTheme(R.style.MyTheme1);
    }
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tv = findViewById(R.id.tv);
    getActionBar().show();
    getActionBar().setTitle("ActionBar Title");
    tv.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_1_THEME_FLAG){
          MyApplication.SHOW_THEME_FLAG = MyApplication.SHOW_2_THEME_FLAG;
        }else if(MyApplication.SHOW_THEME_FLAG == MyApplication.SHOW_2_THEME_FLAG){
          MyApplication.SHOW_THEME_FLAG = MyApplication.SHOW_1_THEME_FLAG;
        }
        Intent mIntent = getIntent();
        finish();
        overridePendingTransition(0,0);
        startActivity(mIntent);
      }
    });
  }
}

4.常用主题style设置

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<style name="MyTheme1" parent="@android:style/Theme.Material">
    <!-- 状态栏 -->
    <item name="android:colorPrimaryDark">#f00</item>
    <!-- ActionBar颜色 -->
    <item name="android:colorPrimary">#ff0</item>
    <!-- 界面背景色 -->
    <item name="android:windowBackground">@color/windowBackgroundColor1</item>
    <!-- 导航栏颜色 -->
    <item name="android:navigationBarColor">#0000ff</item>
  </style>
  <style name="MyTheme2" parent="@android:style/Theme.Material">
    <!-- 状态栏 -->
    <item name="android:colorPrimaryDark">#757575</item>
    <!-- ActionBar颜色 -->
    <item name="android:colorPrimary">#03A9F4</item>
    <!-- 界面背景色 -->
    <item name="android:windowBackground">@color/windowBackgroundColor2</item>
    <!-- 导航栏颜色 -->
    <item name="android:navigationBarColor">#1976D2</item>
  </style>