Android4.0以上强制显示menu菜单按钮

/**

* 显示menu菜单

*/

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();

}

}