画面を指でタッチしたことは onTouchEvent を使えばを検出でき、その後に指を離した等は MotionEvent から状況を取得できます。
Android Studio 2.2.2
Android 7.1.1
Android 7.1.1
onTouchEvent, MotionEvent
MotionEvent のよく使うメソッド
- getX()
- getY()
- getAction()
- ACTION_DOWN
- ACTION_MOVE
- ACTION_UP
- ACTION_CANCEL
- getDownTime()
- getEventTime()
- getPressure()
MainActivity.java
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import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.MotionEvent; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public boolean onTouchEvent(MotionEvent motionEvent) { switch (motionEvent.getAction()) { case MotionEvent.ACTION_DOWN: Log.d("", "ACTION_DOWN"); Log.d("", "EventLocation X:" + motionEvent.getX() + ",Y:" + motionEvent.getY()); break; case MotionEvent.ACTION_UP: Log.d("", "ACTION_UP"); long eventDuration2 = motionEvent.getEventTime() - motionEvent.getDownTime(); Log.d("", "eventDuration2: " +eventDuration2+" msec"); Log.d("", "Pressure: " + motionEvent.getPressure()); break; case MotionEvent.ACTION_MOVE: Log.d("", "ACTION_MOVE"); break; case MotionEvent.ACTION_CANCEL: Log.d("", "ACTION_CANCEL"); break; } return false; } } |
タッチ期間は
long eventDuration = motionEvent.getEventTime() – motionEvent.getDownTime();
で計算します
タッチした時のLog
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14:58:25.693 ....testtouchevent D/ ACTION_DOWN 14:58:25.693 ....testtouchevent D/ EventLocation X:196.18164,Y:464.0 14:58:25.723 ....testtouchevent D/ ACTION_MOVE 14:58:25.733 ....testtouchevent D/ ACTION_MOVE 14:58:25.753 ....testtouchevent D/ ACTION_MOVE 14:58:25.813 ....testtouchevent D/ ACTION_UP 14:58:25.813 ....testtouchevent D/ eventDuration2: 118 msec 14:58:25.813 ....testtouchevent D/ Pressure: 0.38823533 |
これを使って、画像をドラッグ することもできます。