接下來的這個小例子演示當手指在觸摸屏上拖動的時候，一個紅色的小球更隨手指進行移動。不過這個例子大致演示了一下自定義UI組件。

先來看看效果吧：

代碼大致如下：

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代碼如下：

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代碼如下：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/root"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ></LinearLayout>

總結

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