Android获取屏幕高度、状态栏高度、标题栏高度

在android应用中，有时需要计算个View的位置，导致需要计算状态栏高度，标题栏高度等信息。为以后方便，在此做个简单记录。

晒代码前先了解一下android屏幕区域的划分，如下图（该图引用自此文http://www.iteye.com/topic/828830 ）

1、 屏幕区域的获取

activity.getWindowManager().getDefaultDisplay();

2、应用区域的获取

      Rect outRect = new Rect();      activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect);

其中，outRect.top 即是状态栏高度。

3、view绘制区域获取

Rect outRect = new Rect();activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getDrawingRect(outRect);

用绘制区域的outRect.top - 应用区域的outRect.top 即是标题栏的高度。

注意： 如果刚启动Activity时就要计算这些数据，最好在 onWindowFocusChanged  函数中进行， 否则得到的某些数据可能是错误的，比如，应用区域高宽的获取。

详细代码如下：

public class ScreenSize extends Activity {    private TextView mScreenSizeView ;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_screen_size);        mScreenSizeView = (TextView) findViewById(R.id.screen_size);    }    @Override    public void onWindowFocusChanged(boolean hasFocus) {        super.onWindowFocusChanged(hasFocus);        if(hasFocus){            System.out.println("second");            StringBuilder sb = new StringBuilder();            Dimension dimen1 = getAreaOne(this);            Dimension dimen2 = getAreaTwo(this);            Dimension dimen3 = getAreaThree(this);            sb.append("Area one : \n\tWidth: "+dimen1.mWidth + ";\tHeight: "+dimen1.mHeight);            sb.append("\nArea two: \n\tWidth: "+dimen2.mWidth + ";\tHeight: "+dimen2.mHeight);            sb.append("\nArea three: \n\tWidth: "+dimen3.mWidth + ";\tHeight: "+dimen3.mHeight);            mScreenSizeView.setText(sb.toString());        }    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.activity_screen_size, menu);        return true;    }        private Dimension getAreaOne(Activity activity){        Dimension dimen = new Dimension();        Display disp = activity.getWindowManager().getDefaultDisplay();        Point outP = new Point();        disp.getSize(outP);        dimen.mWidth = outP.x ;        dimen.mHeight = outP.y;        return dimen;    }    private Dimension getAreaTwo(Activity activity){        Dimension dimen = new Dimension();      Rect outRect = new Rect();      activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect);      System.out.println("top:"+outRect.top +" ; left: "+outRect.left) ;      dimen.mWidth = outRect.width() ;      dimen.mHeight = outRect.height();        return dimen;    }    private Dimension getAreaThree(Activity activity){        Dimension dimen = new Dimension();     // 用户绘制区域         Rect outRect = new Rect();        activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getDrawingRect(outRect);        dimen.mWidth = outRect.width() ;        dimen.mHeight = outRect.height();        // end        return dimen;    }

    private class Dimension {        public int mWidth ;        public int mHeight ;        public Dimension(){}    }}