检测横竖屏：
重写函数：
@Override
public void onConfigurationChanged(Configuration config) {
try {
super.onConfigurationChanged(config);
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
Toast.makeText(TestApp2.this, "当前是横向",Toast.LENGTH_SHORT).show();
} else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
Toast.makeText(TestApp2.this, "哈哈，切竖屏",Toast.LENGTH_SHORT).show();
}
} catch (Exception ex) {
}
}