【发布时间】：2016-03-06 00:42:15
【问题描述】：
有没有办法防止用户通过在小吃栏上滑动而将其关闭？
我有一个在网络登录时显示小吃店的应用，我想避免它被关闭。
根据 Nikola Despotoski 的建议，我尝试了两种解决方案：
private void startSnack(){
loadingSnack = Snackbar.make(findViewById(R.id.email_login_form), getString(R.string.logging_in), Snackbar.LENGTH_INDEFINITE)
.setAction("CANCEL", new OnClickListener() {
@Override
public void onClick(View view) {
getOps().cancelLogin();
enableControls();
}
});
loadingSnack.getView().setOnTouchListener(new View.OnTouchListener() {
public long mInitialTime;
@Override
public boolean onTouch(View v, MotionEvent event) {
if (v instanceof Button) return false; //Action view was touched, proceed normally.
else {
switch (MotionEventCompat.getActionMasked(event)) {
case MotionEvent.ACTION_DOWN: {
Log.i(TAG, "ACTION_DOWN");
mInitialTime = System.currentTimeMillis();
break;
}
case MotionEvent.ACTION_UP: {
Log.i(TAG, "ACTION_UP");
long clickDuration = System.currentTimeMillis() - mInitialTime;
if (clickDuration <= ViewConfiguration.getTapTimeout()) {
return false;// click event, proceed normally
}
}
case MotionEvent.ACTION_MOVE: {
Log.i(TAG, "ACTION_MOVE");
return true;
}
}
return true;
}
}
});
ViewGroup.LayoutParams lp = loadingSnack.getView().getLayoutParams();
if (lp != null && lp instanceof CoordinatorLayout.LayoutParams) {
((CoordinatorLayout.LayoutParams)lp).setBehavior(new DummyBehavior());
loadingSnack.getView().setLayoutParams(lp);
Log.i(TAG, "Dummy behavior assigned to " + lp.toString());
}
loadingSnack.show();
}
这是 DummyBehavior 类：
public class DummyBehavior extends CoordinatorLayout.Behavior<View>{
/**
* Debugging tag used by the Android logger.
*/
protected final static String TAG =
DummyBehavior.class.getSimpleName();
public DummyBehavior() {
Log.i(TAG, "Dummy behavior created");
StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
Log.i(TAG, "Method " + stackTrace[2].getMethodName() );
}
public DummyBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
Log.i(TAG, "Dummy behavior created");
}
@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean onTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean blocksInteractionBelow(CoordinatorLayout parent, View child) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
}
@Override
public boolean isDirty(CoordinatorLayout parent, View child) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean onMeasureChild(CoordinatorLayout parent, View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean onLayoutChild(CoordinatorLayout parent, View child, int layoutDirection) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public void onNestedScrollAccepted(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
}
@Override
public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, View child, View target) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
}
@Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
}
@Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dx, int dy, int[] consumed) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
}
@Override
public boolean onNestedFling(CoordinatorLayout coordinatorLayout, View child, View target, float velocityX, float velocityY, boolean consumed) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public boolean onNestedPreFling(CoordinatorLayout coordinatorLayout, View child, View target, float velocityX, float velocityY) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return false;
}
@Override
public WindowInsetsCompat onApplyWindowInsets(CoordinatorLayout coordinatorLayout, View child, WindowInsetsCompat insets) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return null;
}
@Override
public void onRestoreInstanceState(CoordinatorLayout parent, View child, Parcelable state) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
}
@Override
public Parcelable onSaveInstanceState(CoordinatorLayout parent, View child) {
Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
return null;
}
}
但是我的snackbar在滑动时仍然消失，这是一个典型的日志：
12-02 22:26:43.864 19598-19598/ I/DummyBehavior: Dummy behavior created
12-02 22:26:43.866 19598-19598/ I/DummyBehavior: Method <init>
12-02 22:26:43.866 19598-19598/ I/LifecycleLoggingActivity: Dummy behavior assigned to android.support.design.widget.CoordinatorLayout$LayoutParams@808c0e9
12-02 22:26:44.755 19598-19598/ I/LifecycleLoggingActivity: ACTION_DOWN
12-02 22:26:44.798 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.815 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.832 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.849 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.866 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.883 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
【问题讨论】：
标签： android swipe dismiss android-snackbar snackbar