在Android开发过程中,有时需要获取触摸位置的坐标,以便作进一步处理,比如做炫酷的动画效果,或者响应其他操作。
本文简单介绍Android中触屏操作时,触屏的开始位置、当前位置、结束位置。
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< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
xmlns:tools = "http://schemas.android.com/tools"
android:layout_width = "match_parent"
android:layout_height = "match_parent"
tools:context = "com.example.com.TouchTest" >
< LinearLayout
android:id = "@+id/ll_touch"
android:layout_width = "match_parent"
android:layout_height = "match_parent"
android:orientation = "vertical" >
< TextView
android:id = "@+id/touch_show_start"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "@string/hello_world" />
< TextView
android:id = "@+id/touch_show"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "@string/hello_world" />
</ LinearLayout >
</ RelativeLayout >
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Activity中的操作:
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public class TouchTest extends Activity implements OnTouchListener {
private TextView tvTouchShowStart;
private TextView tvTouchShow;
private LinearLayout llTouch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_touch_test);
init();
}
private void init() {
tvTouchShowStart = (TextView) findViewById(R.id.touch_show_start);
tvTouchShow = (TextView) findViewById(R.id.touch_show);
llTouch = (LinearLayout) findViewById(R.id.ll_touch);
llTouch.setOnTouchListener( this );
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
/**
* 点击的开始位置
*/
case MotionEvent.ACTION_DOWN:
tvTouchShowStart.setText( "起始位置:(" + event.getX() + "," + event.getY());
break ;
/**
* 触屏实时位置
*/
case MotionEvent.ACTION_MOVE:
tvTouchShow.setText( "实时位置:(" + event.getX() + "," + event.getY());
break ;
/**
* 离开屏幕的位置
*/
case MotionEvent.ACTION_UP:
tvTouchShow.setText( "结束位置:(" + event.getX() + "," + event.getY());
break ;
default :
break ;
}
/**
* 注意返回值
* true:view继续响应Touch操作;
* false:view不再响应Touch操作,故此处若为false,只能显示起始位置,不能显示实时位置和结束位置
*/
return true ;
}
}
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效果图:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/carter_yu/article/details/50499040