【汇总】Android 常用方法整理

1.解决ActionBar OverFlow按钮不显示。(在oncreate中调用即可)

private void setOverflowShowingAlways() {  
    try {  
        ViewConfiguration config = ViewConfiguration.get(this);  
        Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");  
        menuKeyField.setAccessible(true);  
        menuKeyField.setBoolean(config, false);  
    } catch (Exception e) {  
        e.printStackTrace();  
    }  
}  

2.解决ActionBar Overflow中的按钮只有title没有图片的方法。(重写onMenuOpend方法)

 @Override
    public boolean onMenuOpened(int featureId, Menu menu) {

        if (featureId == Window.FEATURE_ACTION_BAR && menu != null) {
            if (menu.getClass().getSimpleName().equals("MenuBuilder")) {
                try {
                    Method m = menu.getClass().getDeclaredMethod("setOptionalIconsVisible", Boolean.TYPE);
                    m.setAccessible(true);
                    m.invoke(menu, true);
                } catch (Exception e) {
                }
            }
        }
        return super.onMenuOpened(featureId, menu);
    }

3.