Android 如何在活动中实现QuickReturnList?
如何实现选项卡,为每个选项卡使用活动。我找到了,但它是用片段实现的。这是一个视频,正好显示了我想做什么 以下是我一直想做的: DefaultActivity.javaAndroid 如何在活动中实现QuickReturnList?,android,android-listview,android-fragments,Android,Android Listview,Android Fragments,如何实现选项卡,为每个选项卡使用活动。我找到了,但它是用片段实现的。这是一个视频,正好显示了我想做什么 以下是我一直想做的: DefaultActivity.java @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LayoutInflater inflater = (LayoutInflater) Defaul
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater inflater = (LayoutInflater) DefaultActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.fragment, null);
mHeader = inflater.inflate(R.layout.header, null);
mQuickReturnView = (TextView) view.findViewById(R.id.sticky);
mPlaceHolder = mHeader.findViewById(R.id.placeholder);
mListView = (QuickReturnListView) getListView(); //showing class cast exception here
mQuickReturnView.setText("Default");
mListView.addHeaderView(mHeader);
String[] array = new String[] { "Android", "Android", "Android",
"Android", "Android", "Android", "Android", "Android",
"Android", "Android", "Android", "Android", "Android",
"Android", "Android", "Android" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,array);
mListView.getViewTreeObserver().addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mQuickReturnHeight = mQuickReturnView.getHeight();
mListView.computeScrollY();
mCachedVerticalScrollRange = mListView.getListHeight();
}
});
mListView.setOnScrollListener(new OnScrollListener() {
@SuppressLint("NewApi")
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
mScrollY = 0;
int translationY = 0;
if (mListView.scrollYIsComputed()) {
mScrollY = mListView.getComputedScrollY();
}
int rawY = mPlaceHolder.getTop()
- Math.min(
mCachedVerticalScrollRange
- mListView.getHeight(), mScrollY);
switch (mState) {
case STATE_OFFSCREEN:
if (rawY <= mMinRawY) {
mMinRawY = rawY;
} else {
mState = STATE_RETURNING;
}
translationY = rawY;
break;
case STATE_ONSCREEN:
if (rawY < -mQuickReturnHeight) {
mState = STATE_OFFSCREEN;
mMinRawY = rawY;
}
translationY = rawY;
break;
case STATE_RETURNING:
translationY = (rawY - mMinRawY) - mQuickReturnHeight;
if (translationY > 0) {
translationY = 0;
mMinRawY = rawY - mQuickReturnHeight;
}
if (rawY > 0) {
mState = STATE_ONSCREEN;
translationY = rawY;
}
if (translationY < -mQuickReturnHeight) {
mState = STATE_OFFSCREEN;
mMinRawY = rawY;
}
break;
}
/** this can be used if the build is below honeycomb **/
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.HONEYCOMB) {
anim = new TranslateAnimation(0, 0, translationY,
translationY);
anim.setFillAfter(true);
anim.setDuration(0);
mQuickReturnView.startAnimation(anim);
} else {
mQuickReturnView.setTranslationY(translationY);
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
});
rlMain = (RelativeLayout)findViewById(R.id.main);
rlMain.addView(view);
setContentView(R.layout.activity_main);
}
只需将每个选项卡视为具有相同视图的独立应用程序。唯一的区别是选择了“开关”选项卡 您唯一的缺点是性能,因为活动是比片段重得多的过程。 此外,如果您希望在活动之间共享数据,那么这将比使用片段更加困难
你们也会发现这个教程很有趣。它显示了活动转换的小示例。您确定您有如下标记:
<your_package_path.QuickReturnListView
你的问题是什么?我的主要问题是试图使用活动制作与视频中给出的listview完全相同的listview。在示例代码中,它是使用片段的。@MD我知道我不太清楚,但是如果你仔细阅读这个示例,你就会理解我的问题。我用Activity实现了同样的功能,@MD在我的实现中,它在java.lang.StackOverflowerError
行中显示view=inflater.inflate(R.layout.fragment,null)
如果我只想要一个活动,你能建议我吗?比如说,示例中的DefaultFragment
。那么我怎样才能把它转换成活动呢。@Kunu你在你找到的教程中得到了它的完整源代码。我怎么可能帮你更多呢?!
<your_package_path.QuickReturnListView