| java.lang.Object | ||
| ↳ | android.view.InputEvent | |
| ↳ | android.view.MotionEvent |
|
常用的就一下几种事件：
| /** | |
| * Constant for {@link #getActionMasked}: A pressed gesture has started, the | |
| * motion contains the initial starting location. | |
| * <p> | |
| * This is also a good time to check the button state to distinguish | |
| * secondary and tertiary button clicks and handle them appropriately. | |
| * Use {@link #getButtonState} to retrieve the button state. | |
| * </p> | |
| */ | |
| public static final int ACTION_DOWN = 0; | |
| /** | |
| * Constant for {@link #getActionMasked}: A pressed gesture has finished, the | |
| * motion contains the final release location as well as any intermediate | |
| * points since the last down or move event. | |
| */ | |
| public static final int ACTION_UP = 1; | |
| /** | |
| * Constant for {@link #getActionMasked}: A change has happened during a | |
| * press gesture (between {@link #ACTION_DOWN} and {@link #ACTION_UP}). | |
| * The motion contains the most recent point, as well as any intermediate | |
| * points since the last down or move event. | |
| */ | |
| public static final int ACTION_MOVE = 2; | |
| /** | |
| * Constant for {@link #getActionMasked}: The current gesture has been aborted. | |
| * You will not receive any more points in it. You should treat this as | |
| * an up event, but not perform any action that you normally would. | |
| */ | |
| public static final int ACTION_CANCEL = 3; | |
| /** | |
| * Constant for {@link #getActionMasked}: A movement has happened outside of the | |
| * normal bounds of the UI element. This does not provide a full gesture, | |
| * but only the initial location of the movement/touch. | |
| */ | |
| public static final int ACTION_OUTSIDE = 4; | |
| /** | |
| * Constant for {@link #getActionMasked}: A non-primary pointer has gone down. | |
| * <p> | |
| * Use {@link #getActionIndex} to retrieve the index of the pointer that changed. | |
| * </p><p> | |
| * The index is encoded in the {@link #ACTION_POINTER_INDEX_MASK} bits of the | |
| * unmasked action returned by {@link #getAction}. | |
| * </p> | |
| */ | |
| public static final int ACTION_POINTER_DOWN = 5; | |
| /** | |
| * Constant for {@link #getActionMasked}: A non-primary pointer has gone up. | |
| * <p> | |
| * Use {@link #getActionIndex} to retrieve the index of the pointer that changed. | |
| * </p><p> | |
| * The index is encoded in the {@link #ACTION_POINTER_INDEX_MASK} bits of the | |
| * unmasked action returned by {@link #getAction}. | |
| * </p> | |
| */ | |
| public static final int ACTION_POINTER_UP = 6; |
Google API 给出的关于ACTION_CANCEL这个事件的解释是你可以把它当做是ACTION_UP，但实际上什么事都不会做。实际使用中也极少使用到这个状态，通常都是与事件ACTION_UP做相同处理。印象里Google提供的触摸和按住延迟功能开启后才有ACTION_CANCEL事件上报用来取消操作。所以我们可以笼统的认为所有的触控事件都是以ACTION_DOWN开始以ACTION_UP。
快速点击事件：
04-30 17:36:54.795: D/MotionEventTest(12422): ACTION_DOWN
04-30 17:36:54.798: D/MotionEventTest(12422): ACTION_UP
长按事件：
04-30 17:38:43.222: D/MotionEventTest(12422): ACTION_DOWN
04-30 17:38:43.253: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:38:43.286: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:38:43.317: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:38:44.433: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:38:44.448: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:38:44.455: D/MotionEventTest(12422): ACTION_UP
移动事件：
04-30 17:40:56.330: D/MotionEventTest(12422): ACTION_DOWN
04-30 17:40:56.630: D/MotionEventTest(12422): ACTION_MOVE
很多个ACTION_MOVE事件
04-30 17:40:58.278: D/MotionEventTest(12422): ACTION_UP
多指触控事件：
04-30 17:42:45.080: D/MotionEventTest(12422): ACTION_DOWN
04-30 17:42:45.083: D/MotionEventTest(12422): ACTION_POINTER_DOWN
04-30 17:42:45.102: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.168: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.185: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.202: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.607: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.624: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.641: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.646: D/MotionEventTest(12422): ACTION_POINTER_UP
04-30 17:42:45.961: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.968: D/MotionEventTest(12422): ACTION_MOVE
04-30 17:42:45.974: D/MotionEventTest(12422): ACTION_UP
Google API reference：
http://api.apkbus.com/reference/android/view/MotionEvent.html
MotiionEvent source code:
https://github.com/banxi1988/platform_frameworks_base/blob/master/core/java/android/view/MotionEvent.java
自己写了个小的debug demon帮助理解MotionEvent
package com.example.motionevent;
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 event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_POINTER_DOWN:
Log.d("MotionEventTest","ACTION_POINTER_DOWN");
break;
case MotionEvent.ACTION_POINTER_UP:
Log.d("MotionEventTest","ACTION_POINTER_UP");
break;
case MotionEvent.ACTION_DOWN:
Log.d("MotionEventTest","ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.d("MotionEventTest","ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.d("MotionEventTest","ACTION_UP");
break;
case MotionEvent.ACTION_CANCEL:
Log.d("MotionEventTest","ACTION_CANCEL");
break;
default:
Log.d("liji3","default");
break;
}
return super.onTouchEvent(event);
}
}