Android中獲取控制元件的位置
阿新 • • 發佈:2019-02-11
getLocationOnScree:計算該檢視在全域性座標系中的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)//獲取在當前螢幕內的絕對座標
getLocationInWindow :計算該檢視在它所在的widnow的座標x,y值,//獲取在整個視窗內的絕對座標 (不是很理解= =、)
getLeft , getTop,
getBottom,getRight,
這一組是獲取相對在它父親裡的座標
注意:如果在Activity的OnCreate()事件輸出那些引數,是全為0,要等UI控制元件都載入完了才能獲取到這些。
程式碼實現:
佈局檔案:
- <?xml version="1.0"
- <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>
- 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;
- publicclass LocationActivity extends Activity {
- /** Called when the activity is first created. */
- private ImageView t = null;
- private Button button = null;
- @Override
- publicvoid 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());
- }
- publicclass buttonListener implements OnClickListener{
- publicvoid onClick(View v)
- {
- int[] location = newint[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());
- }
- }
- }