Android得到控制項在螢幕中的座標

 

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

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

getLeft , getTop, getBottom, getRight, 這一組是擷取相對在它父親裡的座標

如果在Activity的OnCreate()事件輸出那些參數，是全為0，要等UI控制項都載入完了才能擷取到這些。

 

[java] 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());
  }
    }
}

 

[java] <?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>

  

摘自 落日小屋