Android獲得控件在屏幕中的座標

getLocationOnScreen ，計算該視圖在全局座標系中的x，y值，（注意這個值是要從屏幕頂端算起，也就是索包括了通知欄的高度）//獲取在當前屏幕內的絕對座標

getLocationInWindow ，計算該視圖在它所在的widnow的座標x，y值，//獲取在整個窗口內的絕對座標 (不是很理解= =、)

getLeft , getTop, getBottom, getRight, 這一組是獲取相對在它父親裏的座標

若是在Activity的OnCreate()事件輸出那些參數，是全爲0，要等UI控件都加載完了才能獲取到這些。

package xiaosi.location;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class LocationActivity extends Activity {
/** Called when the activity is first created. */
private ImageView t = null;
private Button button = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

t = (ImageView)findViewById(R.id.l);
button = (Button)findViewById(R.id.button);
button.setOnClickListener(new buttonListener());
}
public class buttonListener implements OnClickListener{

public void onClick(View v)
{
int[] location = new int[2];
t.getLocationOnScreen(location);
int x = location[0];
int y = location[1];
System.out.println("x:"+x+"y:"+y);
System.out.println("圖片各個角Left："+t.getLeft()+"Right："+t.getRight()+"Top："+t.getTop()+"Bottom："+t.getBottom());
}
}
}

package xiaosi.location;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class LocationActivity extends Activity {
    /** Called when the activity is first created. */
	private ImageView t = null;
	private Button button = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        t = (ImageView)findViewById(R.id.l);
        button = (Button)findViewById(R.id.button);
        button.setOnClickListener(new buttonListener());
    }   
    public class buttonListener implements OnClickListener{

		public void onClick(View v)
		{
			int[] location = new int[2];
	        t.getLocationOnScreen(location);
	        int x = location[0];
	        int y = location[1];
	        System.out.println("x:"+x+"y:"+y);
            System.out.println("圖片各個角Left："+t.getLeft()+"Right："+t.getRight()+"Top："+t.getTop()+"Bottom："+t.getBottom());
		}
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="button"/>
<ImageView
android:id="@+id/l"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="@drawable/a" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="button"/>
    <ImageView
        android:id="@+id/l"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:src="@drawable/a" />
</LinearLayout>