MainActivity如下:
package cc.teststatusbarheight;
import java.lang.reflect.Field;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.content.Context;
/**
* Demo描述:
* 利用反射获取状态栏StatusBar的高度
*
* 反射基础:
* http://blog.csdn.net/lfdfhl/article/details/10311505
*
* 参考资料:
* http://blog.csdn.net/lilu_leo/article/details/10211327
* http://blog.csdn.net/dany1202/article/details/6571010
* Thank you very much
*/
public class MainActivity extends Activity {
private Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
mButton=(Button) findViewById(R.id.button);
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
getStatusBarHeight(MainActivity.this);
}
});
}
private void getStatusBarHeight(Context context){
int statusBarHeight=0;
try {
Class clazz=Class.forName("com.android.internal.R$dimen");
Object object=clazz.newInstance();
Field field=clazz.getField("status_bar_height");
//反射出该对象中status_bar_height字段所对应的在R文件的id值
//该id值由系统工具自动生成,文档描述如下:
//The desired resource identifier, as generated by the aapt tool.
int id = Integer.parseInt(field.get(object).toString());
System.out.println("id="+id);
//依据id值获取到状态栏的高度,单位为像素
statusBarHeight = context.getResources().getDimensionPixelSize(id);
System.out.println("statusBarHeight="+statusBarHeight+"pixel");
} catch (Exception e) {
// TODO: handle exception
}
}
}
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dip"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="利用反射获取状态栏StatusBar的高度"
android:layout_centerInParent="true"
/>
</RelativeLayout>
