如何解决当起始滑动点位于可点击视图上时，如何允许滑动视图？
我正在尝试将滑动功能与布局上的可点击视图结合起来。 我通过遵循 https://github.com/romannurik/Android-SwipeToDismiss
中的库实现来实现SwipeDismissTouchListener
现在我有这个布局（如下），我可以向右或向左滑动它，但我注意到如果我的滑动起点在任何可点击的对象上，如（此处）TextView，我无法滑动整个视图。
我不知道如何才能同时做到：
- 当我滑动时 -> 当我的滑动起点在任何可点击对象上时向右滑动
- 当我点击 -> 点击
TextView
这是我的代码，MainActivity：
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewGroup parent = findViewById(R.id.parent);
ViewGroup container = findViewById(R.id.container);
TextView text1 = findViewById(R.id.text1);
text1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(),"Clicked on text1",Toast.LENGTH_SHORT).show();
}
});
container.setClickable(true);
container.setFocusable(false);
container.setOnTouchListener(
new SwipeDismissTouchListener(parent,new SwipeDismissTouchListener.DismissCallbacks() {
@Override
public boolean canDismiss() {
return true;
}
@Override
public void onDismiss(View view) {
parent.removeView(container);
}
}));
}
}
SwipeDismissTouchListener：
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
public class SwipeDismissTouchListener implements View.OnTouchListener {
// Cached ViewConfiguration and system-wide constant values
private int mSlop;
private int mMinFlingVelocity;
private int mMaxFlingVelocity;
private long mAnimationTime;
// Fixed properties
private View mView;
private DismissCallbacks mCallbacks;
private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
// Transient properties
private float mDownX;
private float mDownY;
private boolean mSwiping;
private int mSwipingSlop;
private VelocityTracker mVelocityTracker;
private float mTranslationX;
public interface DismissCallbacks {
boolean canDismiss();
void onDismiss(View view);
}
public SwipeDismissTouchListener(View view,DismissCallbacks callbacks) {
ViewConfiguration vc = ViewConfiguration.get(view.getContext());
mSlop = vc.getScaledTouchSlop();
mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16;
mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
mAnimationTime = view.getContext().getResources().getInteger(
android.R.integer.config_shortAnimTime);
mView = view;
mCallbacks = callbacks;
}
@Override
public boolean onTouch(View view,MotionEvent motionEvent) {
// offset because the view is translated during swipe
motionEvent.offsetLocation(mTranslationX,0);
// not sure what it is
if (mViewWidth < 2) {
mViewWidth = mView.getWidth();
}
switch (motionEvent.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
mDownX = motionEvent.getRawX();
mDownY = motionEvent.getRawY();
if (mCallbacks.canDismiss()) {
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(motionEvent);
}
return false;
}
case MotionEvent.ACTION_UP: {
if (mVelocityTracker == null) {
break;
}
float deltaX = motionEvent.getRawX() - mDownX;
mVelocityTracker.addMovement(motionEvent);
mVelocityTracker.computeCurrentVelocity(1000);
float velocityX = mVelocityTracker.getXVelocity();
float absVelocityX = Math.abs(velocityX);
float absVelocityY = Math.abs(mVelocityTracker.getYVelocity());
boolean dismiss = false;
boolean dismissRight = false;
if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) {
dismiss = true;
dismissRight = deltaX > 0;
} else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity
&& absVelocityY < absVelocityX
&& absVelocityY < absVelocityX && mSwiping) {
// dismiss only if flinging in the same direction as dragging
dismiss = (velocityX < 0) == (deltaX < 0);
dismissRight = mVelocityTracker.getXVelocity() > 0;
}
if (dismiss) {
// dismiss
mView.animate()
.translationX(dismissRight ? mViewWidth : -mViewWidth)
.alpha(0)
.setDuration(mAnimationTime)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
performDismiss();
}
});
} else if (mSwiping) {
// cancel
mView.animate()
.translationX(0)
.alpha(1)
.setDuration(mAnimationTime)
.setListener(null);
}
mVelocityTracker.recycle();
mVelocityTracker = null;
mTranslationX = 0;
mDownX = 0;
mDownY = 0;
mSwiping = false;
break;
}
case MotionEvent.ACTION_CANCEL: {
if (mVelocityTracker == null) {
break;
}
mView.animate()
.translationX(0)
.alpha(1)
.setDuration(mAnimationTime)
.setListener(null);
mVelocityTracker.recycle();
mVelocityTracker = null;
mTranslationX = 0;
mDownX = 0;
mDownY = 0;
mSwiping = false;
break;
}
case MotionEvent.ACTION_MOVE: {
if (mVelocityTracker == null) {
break;
}
mVelocityTracker.addMovement(motionEvent);
float deltaX = motionEvent.getRawX() - mDownX;
float deltaY = motionEvent.getRawY() - mDownY;
if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
mSwiping = true;
mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop);
view.getParent().requestDisallowInterceptTouchEvent(true);
// Cancel listview's touch
MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
cancelEvent.setAction(MotionEvent.ACTION_CANCEL |
(motionEvent.getActionIndex() <<
MotionEvent.ACTION_POINTER_INDEX_SHIFT));
view.onTouchEvent(cancelEvent);
cancelEvent.recycle();
}
if (mSwiping) {
mTranslationX = deltaX;
mView.setTranslationX(deltaX - mSwipingSlop);
// TODO: use an ease-out interpolator or such
mView.setAlpha(Math.max(0f,Math.min(1f,1f - 2f * Math.abs(deltaX) / mViewWidth)));
return true;
}
break;
}
}
return false;
}
private void performDismiss() {
final ViewGroup.LayoutParams lp = mView.getLayoutParams();
final int originalHeight = mView.getHeight();
ValueAnimator animator = ValueAnimator.ofInt(originalHeight,1).setDuration(mAnimationTime);
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mCallbacks.onDismiss(mView);
// Reset view presentation
mView.setAlpha(1f);
mView.setTranslationX(0);
lp.height = originalHeight;
mView.setLayoutParams(lp);
}
});
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
lp.height = (Integer) valueAnimator.getAnimatedValue();
mView.setLayoutParams(lp);
}
});
animator.start();
}
}
activity_main.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false"
android:orientation="horizontal">
<LinearLayout
android:id="@+id/parent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#7CB342"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="@+id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:background="#AEEA00"
android:gravity="center"
android:text="Test"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
解决方法
阅读 onInterceptTouchEvent() 的文档：https://developer.android.com/training/gestures/viewgroup#intercept
提供的代码片段应涵盖您的确切用例。
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