5
我在我的android應用程序中使用Next和Previous按鈕的水平滾動視圖。我只想在scollview需要滾動時顯示這些按鈕。滾動視圖內容的寬度超過了顯示寬度。同時希望在到達時隱藏上一個和下一個按鈕第一個和最後一個項目。點擊這些按鈕時如何操作下一個/上一個項目？如何滾動按鈕上的HorizontalScrollView點擊Android？
main.xml中
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mainLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ffffff" >
<Button
android:id="@+id/btnPrevoius"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="Previous"
android:visibility="gone" />
<HorizontalScrollView
android:id="@+id/horizontalScrollView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="5dip"
android:layout_marginRight="5dip"
android:layout_toLeftOf="@+id/btnNext"
android:layout_toRightOf="@+id/btnPrevoius"
android:fillViewport="true" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
</LinearLayout>
</HorizontalScrollView>
<Button
android:id="@+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Next"
android:visibility="gone" />
</RelativeLayout>
活動
public class SampleActivity extends Activity {
private static LinearLayout linearLayout;
private static HorizontalScrollView horizontalScrollView;
private static Button btnPrevious;
private static Button btnNext;
private static int displayWidth = 0;
private static int arrowWidth = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
horizontalScrollView = (HorizontalScrollView) findViewById(R.id.horizontalScrollView1);
linearLayout = (LinearLayout) findViewById(R.id.linearLayout1);
btnPrevious = (Button) findViewById(R.id.btnPrevoius);
btnNext = (Button) findViewById(R.id.btnNext);
for (int i = 0; i < 15; i++) {
Button button = new Button(this);
button.setTag(i);
button.setText("---");
linearLayout.addView(button);
}
ViewTreeObserver vto = linearLayout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
ViewTreeObserver obs = linearLayout.getViewTreeObserver();
obs.removeGlobalOnLayoutListener(this);
Display display = getWindowManager().getDefaultDisplay();
displayWidth = display.getWidth();
if (linearLayout.getMeasuredWidth() > (displayWidth - 40)) {
btnPrevious.setVisibility(View.VISIBLE);
btnNext.setVisibility(View.VISIBLE);
}
}
});
btnPrevious.setOnClickListener(listnerLeftArrowButton);
horizontalScrollView.setOnTouchListener(listenerScrollViewTouch);
}
private OnTouchListener listenerScrollViewTouch = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
showHideViews();
return false;
}
};
private OnClickListener listnerLeftArrowButton = new OnClickListener() {
@Override
public void onClick(View v) {
horizontalScrollView.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, new KeyEvent(0, 0));
}
};
public static void showHideViews() {
int maxScrollX = horizontalScrollView.getChildAt(0).getMeasuredWidth()- displayWidth;
Log.e("TestProjectActivity", "scroll X = " +horizontalScrollView.getScrollX());
Log.i("TestProjectActivity", "scroll Width = " +horizontalScrollView.getMeasuredWidth());
Log.d("TestProjectActivity", "Max scroll X = " + maxScrollX);
if (horizontalScrollView.getScrollX() == 0) {
hideLeftArrow();
} else {
showLeftArrow();
}
if (horizontalScrollView.getScrollX() == maxScrollX) {
showRightArrow();
} else {
//hideRightArrow();
}
}
private static void hideLeftArrow() {
btnPrevious.setVisibility(View.GONE);
}
private static void showLeftArrow() {
btnPrevious.setVisibility(View.VISIBLE);
}
private static void hideRightArrow() {
btnNext.setVisibility(View.GONE);
}
private static void showRightArrow() {
btnNext.setVisibility(View.VISIBLE);
}
}
的'maxScrollX'值是不適合我是正確的。 如何找到這個最大的scrollvalue？ 由於提前
我很抱歉，我無法理解這些帖子如何解決我的問題。 – 2013-02-15 05:36:33
@DevuSoman你看過我發佈的鏈接，水平滾動視圖以這種方式工作。同樣，如果你想隱藏這些按鈕，你已經設置enablity爲第一個條件爲false，反之亦然。爲了執行下一個之前，你必須申請onclick聽衆在各自的按鈕，並做你想要根據您的選擇... – 2013-02-15 05:43:16
@DevuSoman什麼是你想要的..我只需要設置填充和次要佈局adjust.did你嘗試與我張貼的鏈接？只需應用點擊監聽器上的按鈕..根據你的選擇，你想要做點什麼？ – 2013-02-15 05:51:22