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 > |
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 ; } } |
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