質問編集履歴
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書式の改善、足りない情報の付け足し
test
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File without changes
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test
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@@ -1,7 +1,283 @@
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<4/11に編集しました>
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```java
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//interfaceを作成
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public interface TouchupListener extends EventListener{
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public void strokeWasFinished();
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}
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```
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```java
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//イベントが発生したことを通知するクラス
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public class TouchupNotify {
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private TouchupListener listener;
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// 画像が表示された事を通知
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public void informToActivity() {
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listener.strokeWasFinished();
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}
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// リスナーをセットする
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public void setListener(TouchupListener listener){
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this.listener = listener;
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}
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}
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```
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```java
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public class DrawingView extends View {
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private Paint paint;
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private Path path;
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private TouchupNotify touchupNotify;
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public DrawingView(Context context, AttributeSet attrs) {
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super(context, attrs);
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this.path = new Path();
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this.paint = new Paint();
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paint.setColor(Color.RED);
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this.paint.setStyle(Paint.Style.STROKE);
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this.paint.setAntiAlias(true);
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this.paint.setStrokeWidth(10);
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this.path.reset();
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invalidate();
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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canvas.drawPath(path, paint);
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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float x = event.getX();
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float y = event.getY();
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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this.path.moveTo(x, y);
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break;
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case MotionEvent.ACTION_MOVE:
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this.path.lineTo(x, y);
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break;
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case MotionEvent.ACTION_UP:
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this.path.lineTo(x, y);
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//ここで呼び出すがエラーが出る↓
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touchupNotify.informToActivity();
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break;
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}
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invalidate();
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return true;
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}
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public void delete() {
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this.path.reset();
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invalidate();
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}
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}
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```
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```java
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public class DrawingActivity extends AppCompatActivity implements TouchupListener{
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private TouchupNotify touchupNotify;
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int count=1;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_drawing);
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touchupNotify=new TouchupNotify();
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touchupNotify.setListener(this);
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public void checkPlayerDialog(String message, String btnstr, final int WorH){
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// 確認ダイアログの生成
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if(count==player_num-1){
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return;
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}
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AlertDialog.Builder alertDlg = new AlertDialog.Builder(this);
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alertDlg.setMessage(message);
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alertDlg.setPositiveButton(
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btnstr,
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new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface dialog, int which) {
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// OK ボタンクリック処理
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}
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}
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});
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// 表示
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alertDlg.setCancelable(false);
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alertDlg.create().show();
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count++;
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}
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@Override
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public void strokeWasFinished() {
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checkPlayerDialog(String.valueOf(count)+"画目です", "OK",count);
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}
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}
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```
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1
261
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http://qiita.com/1plus4/items/45773e997f56276aac68
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2
262
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3
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-
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4
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-
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5
263
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このサイトを参考にして、androidでお絵かきアプリを作成しています。
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6
264
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7
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-
DrawingViewで、一画書く度にアクティビティにてメッセージダイアログを出すようにしたいのですが、
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265
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DrawingViewで、一画書く度にアクティビティにてメッセージダイアログを出すようにしたいのですが、
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266
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267
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上記のように独自のリスナーを作成し、アクティビティに実装し、drawingViewで通知してみたところ
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268
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> 04-11 15:55:30.255 2610-2610/com.artwolf.jigokunoiruka.artwolf E/AndroidRuntime: FATAL EXCEPTION: main
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Process: com.artwolf.jigokunoiruka.artwolf, PID: 2610
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java.lang.NullPointerException: Attempt to invoke virtual method 'void com.artwolf.jigokunoiruka.aaaaa.TouchupNotify.informToActivity()' on a null object reference
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at com.artwolf.jigokunoiruka.artwolf.DrawingView.onTouchEvent(DrawingView.java:54)
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282
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283
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というエラーが表示され困っています。
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