Android获得标题栏和状态栏高度，以及立即获取控件的高度

package com.test01;

import android.app.Activity;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.ViewTreeObserver;
import android.view.Window;
import android.widget.TextView;

public class Test01Activity extends Activity {
	/**
	 * 必须要设置一个View作为参照物
	 */
	private TextView tv;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView) findViewById(R.id.tv);
        // 必须用这种方法获得。不用得到的数据为0
        tv.post(new Runnable() {
			
			public void run() {
				init();
			}
		});
        
        // 获取控件的高度
        ViewTreeObserver vto = tv.getViewTreeObserver();
        vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            public boolean onPreDraw() {
                int height = tv.getMeasuredHeight();
                int width = tv.getMeasuredWidth();
                System.out.println(height+",,"+width);
                return true;
            }
        });

    }
    
    private void init(){
    	Rect rect = new Rect();
    	Window window = getWindow();
    	tv.getWindowVisibleDisplayFrame(rect);
    	// 状态栏的高度
    	int statusBarHeight = rect.top;
    	// 标题栏跟状态栏的总体高度
    	int contentViewTop = window.findViewById(Window.ID_ANDROID_CONTENT).getTop();
    	// 标题栏的高度：用上面的值减去状态栏的高度及为标题栏高度
    	int titleBarHeight = contentViewTop - statusBarHeight;
    	System.out.println(statusBarHeight+"..."+contentViewTop+"..."+titleBarHeight);
    }
}