Android 提供多種 View 的 (X, Y) 軸位置設定方式,
如: setLayoutParams
如: setLeft / setTop
如: setX / setY
也提供多種取得 (X, Y) 軸位置的方式,
如: getLeft / getTop
如: getX / getY
之間的差異性, 可以參考下面的範例 :
Layout XML :
XML 內容
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我現在位置"
/>
</AbsoluteLayout>
Main 主程式 :
程式碼
public class TomKuoTest extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView( R.layout.main_test );
setTitle("getX/getY 與 getLeft/getTop 差異");
TextView tv = (TextView)findViewById(R.id.textView);
Log.i("test", "===== TextView 尚未變更位置 =====");
Log.i("test", "getX() / getY() : " + tv.getX() + " / " + tv.getY());
Log.i("test", "getLeft() / getTop() : " + tv.getLeft() + " / " + tv.getTop());
Log.i("test", "===== TextView 透過 setLayoutParams 變更位置 =====");
tv.setLayoutParams( new AbsoluteLayout.LayoutParams( LayoutParams.WRAP_CONTENT
, LayoutParams.WRAP_CONTENT
, 200
, 100
) );
Log.i("test", "getX() / getY() : " + tv.getX() + " / " + tv.getY());
Log.i("test", "getLeft() / getTop() : " + tv.getLeft() + " / " + tv.getTop());
tv.setLeft(300);
tv.setTop(150);
Log.i("test", "===== TextView 透過 setLeft / setTop 變更位置 =====");
Log.i("test", "getX() / getY() : " + tv.getX() + " / " + tv.getY());
Log.i("test", "getLeft() / getTop() : " + tv.getLeft() + " / " + tv.getTop());
tv.setX(500);
tv.setY(300);
Log.i("test", "===== TextView 透過 setX / setY 變更位置 =====");
Log.i("test", "getX() / getY() : " + tv.getX() + " / " + tv.getY());
Log.i("test", "getLeft() / getTop() : " + tv.getLeft() + " / " + tv.getTop());
// 不在同一個程序中取得 View 長寬
new Handler().postDelayed( new Runnable()
{
@Override
public void run()
{
TextView tv = (TextView)findViewById(R.id.textView);
Log.i("test", "Runnable 內 getX() / getY() : " + tv.getX() + " / " + tv.getY());
Log.i("test", "Runnable 內 getLeft() / getTop() : " + tv.getLeft() + " / " + tv.getTop());
}
}, 100 );
}
}
範例結果, 如下 :
