Android MotionEvent 坐标获取

阳光岛主

发布于 2019-02-19 11:41:07

1.9K0

发布于 2019-02-19 11:41:07

文章被收录于专栏：米扑专栏米扑专栏

Android MotionEvent中getX()与getRawX()都是获取屏幕坐标（横），但二者又有区别

getX() ：是获取相对当前控件（View）的坐标

getRawX() ：是获取相对显示屏幕左上角的坐标

演示示例代码

Java代码：

public class MainActivity extends Activity implements OnTouchListener {
	private Button btn;
	private int x = 0, y = 0;
	private int rawX = 0, rawY = 0;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		btn = (Button) findViewById(R.id.btn);
		btn.setOnTouchListener(this);
	}

	@Override
	public boolean onTouch(View view, MotionEvent event) {
		int eventaction = event.getAction();

		switch (eventaction) {
		case MotionEvent.ACTION_DOWN:
			break;

		case MotionEvent.ACTION_MOVE:
			x = (int) event.getX();
			y = (int) event.getY();
			rawX = (int) event.getRawX();
			rawY = (int) event.getRawY();
			
			Log.e("homer", "x = " + x + "; y = " + y + "; rawX = " + rawX + "; rawY = " + rawY);
			break;
			
		case MotionEvent.ACTION_UP:
			break;
		}

		return false;
	}
}

xml 代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/txt"
        android:layout_centerInParent="true"
        android:text="button me" />
</RelativeLayout>

运行结果：