Android利用反射获取状态栏(StatusBar)高度

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>