android被逼学习例子2 -尊龙游戏旗舰厅官网

接下来的这个小例子演示当手指在触摸屏上拖动的时候，一个红色的小球更随手指进行移动。不过这个例子大致演示了一下自定义ui组件。

先来看看效果吧：

代码大致如下：

androiddemoactivity.java

package android.demo;import android.app.activity; import android.os.bundle; import android.provider.contactscontract.commondatakinds.event; import android.view.motionevent; import android.view.view; import android.view.view.ontouchlistener; import android.widget.linearlayout;public class androiddemoactivity extends activity {/** called when the activity is first created. */@overridepublic void oncreate(bundle savedinstancestate) {super.oncreate(savedinstancestate);setcontentview(r.layout.main);linearlayout layout = (linearlayout) findviewbyid(r.id.root);final drawview draw = new drawview(this);draw.setminimumheight(300);draw.setminimumwidth(300);draw.setontouchlistener(new ontouchlistener() {@overridepublic boolean ontouch(view arg0, motionevent evnet) {// todo auto-generated method stubdraw.currentx = evnet.getx();draw.currenty = evnet.gety();draw.invalidate();return false;}});layout.addview(draw);} }

drawview.java代码如下：

package android.demo;import android.content.context; import android.graphics.canvas; import android.graphics.color; import android.graphics.paint; import android.view.view;public class drawview extends view {public drawview(context context) {super(context);}@overrideprotected void ondraw(canvas canvas) {super.ondraw(canvas);paint p = new paint();p.setcolor(color.red);canvas.drawcircle(currentx, currenty, 15, p);}public float currentx = 40;public float currenty = 40; }

main.xml代码如下：

总结

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