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我有這個在我的xml：爲什麼我無法檢測到滾動視圖內的滑動？
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/jokeIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:contentDescription="@string/app_name"
/>
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/jokeIcon" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/allJokesTxt"
style="?android:textAppearanceMedium"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:lineSpacingMultiplier="1.2"
android:padding="16dp" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
這個代碼在我的活動：
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
x1 = event.getX();
break;
case MotionEvent.ACTION_UP:
x2 = event.getX();
float deltaX = x2 - x1;
if (Math.abs(deltaX) > MIN_DISTANCE) {
changeText();
} else {
// consider as something else - a screen tap for example
}
break;
}
return super.onTouchEvent(event);
}
private void changeText(){
// Left to Right swipe action
if (x2 > x1) {
if (jokesCounter > 0) {
--jokesCounter;
currentJoke.setVisibility(View.VISIBLE);
currentJoke.setText(jokesCollector.get(jokesCounter));
} else {
Context context = getApplicationContext();
CharSequence text = "xxx";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
}
// Right to left swipe action
else {
if (jokesLengthCounter >= jokesCounter) {
++jokesCounter;
currentJoke.setVisibility(View.VISIBLE);
currentJoke.setText(jokesCollector.get(jokesCounter));
} else {
Context context = getApplicationContext();
CharSequence text = "xxx";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
}
}
現在這是應該改變屏幕上的文本的用戶刷卡時從左到右，或相反的方式。問題是，只有在ìmageView上完成滑動檢測，我的意思是根本沒有檢測到ScrollView（在實際的textView上）內部的滑動。
這是爲什麼發生？我知道我在這裏錯過了一個非常小的部分，但我目前無法發現它。你能給我一個推動力嗎？