本文介绍了实现对ViewFlipper刷卡动作多GridView的的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有以下的code听刷卡动作在我ViewFlipper GridView的之间进行导航。然而，当它检测到刷卡不一致。我加入了手势监听到每个GridView和还对在GridView每一个项目。还有什么我失踪？
I have the following code to listen to Swipe action to navigate between GridViews in my ViewFlipper. However, it detects the Swipe inconsistently. I added the Gesture Listener to every GridView and also on every item in the GridView. Is there anything else I'm missing?
全部code是如下：
public class ListNewsActivity extends Activity implements OnGestureListener {
String TAG = "ListNewsActivity";
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private static final int DIALOG_PLEASE_WAIT = 100;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
private Animation slideLeftIn;
private Animation slideLeftOut;
private Animation slideRightIn;
private Animation slideRightOut;
private static int MAX_STREAMS = AppSettings.getStreamList().size();
Context context;
ViewFlipper flipper;
StreamHeader header;
int currentStreamIndex = 0;
ArrayList<StreamNav> navList = new ArrayList<StreamNav>();
ArrayList<StreamGridView> gridList = new ArrayList<StreamGridView>();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
context = getApplicationContext();
super.onCreate(savedInstanceState);
setContentView(R.layout.stream);
if (AppSettings.userToken == null) {
AppSettings.getUserToken(context);
}
header = (StreamHeader) findViewById(R.id.stream_header);
setHeaderTitle();
flipper = (ViewFlipper)findViewById(R.id.stream_flipper);
boolean loadData = false;
Log.v(TAG, "No. of streams: " + String.valueOf(AppSettings.getStreamList().size()));
for (Stream stream : AppSettings.getStreamList()) {
Log.v(TAG, "Checking Stream " + stream.getName());
if (stream.getPosts() == null || stream.getPosts().size() == 0) {
loadData = true;
Log.v(TAG, "Empty Stream for " + stream.getBlogId() + ". Data will be loaded.");
break;
}
else {
Log.v(TAG, "Stream " + stream.getName() + " is populated. Posts: " + String.valueOf(stream.getPosts().size()));
}
}
setupNavAndGrids();
if (loadData) {
new LoadStreamTask().execute();
}
else {
populateGrids();
}
slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.stream_flipper_slidein_from_right);
slideLeftOut = AnimationUtils.loadAnimation(this, R.anim.stream_flipper_slideout_to_left);
slideRightIn = AnimationUtils.loadAnimation(this, R.anim.stream_flipper_slidein_from_left);
slideRightOut = AnimationUtils.loadAnimation(this, R.anim.stream_flipper_slideout_to_right);
gestureDetector = new GestureDetector(new MyGestureDetector());
gestureListener = new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
return true;
}
return false;
}
};
}
public void setupNavAndGrids() {
LinearLayout llNav = (LinearLayout) findViewById(R.id.stream_nav_layout);
View.OnClickListener navOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
StreamNav nav = (StreamNav)v;
navigateToStream(nav.getStreamIndex());
}
};
for (int i = 0; i < MAX_STREAMS; i++) {
StreamNav nav = new StreamNav(context, null);
nav.setStreamIndex(i);
nav.setOnClickListener(navOnClickListener);
navList.add(nav);
llNav.addView(nav);
StreamGridView gv = new StreamGridView(context, null);
gv.setOnTouchListener(gestureListener);
gridList.add(gv);
flipper.addView(gv);
}
navList.get(0).setSelected(true);
}
void navigateToStream(int newStreamIndex) {
for (StreamNav nav : navList) {
if (nav.getStreamIndex() == newStreamIndex) {
nav.setSelected(true);
}
else {
nav.setSelected(false);
}
}
Log.v(TAG, "Navigate To Stream: currentStreamIndex=" + String.valueOf(currentStreamIndex) + " newStreamIndex " + String.valueOf(newStreamIndex));
if (currentStreamIndex < newStreamIndex) {
int ctr = newStreamIndex - currentStreamIndex;
for (int i = 0; i < ctr; i++) {
showNext();
}
}
else {
int ctr = currentStreamIndex - newStreamIndex;
for (int i = 0; i < ctr; i++) {
showPrevious();
}
}
}
public void showNext() {
Toast.makeText(context, "Show Next Page for Flipper", Toast.LENGTH_LONG);
flipper.setInAnimation(this, R.anim.stream_flipper_slidein_from_right);
flipper.setOutAnimation(this, R.anim.stream_flipper_slideout_to_left);
flipper.showNext();
setStreamIndex(1);
setHeaderTitle();
}
public void showPrevious() {
Toast.makeText(context, "Show Previous Page for Flipper", Toast.LENGTH_LONG);
flipper.setInAnimation(this, R.anim.stream_flipper_slidein_from_left);
flipper.setOutAnimation(this, R.anim.stream_flipper_slideout_to_right);
flipper.showPrevious();
setStreamIndex(-1);
setHeaderTitle();
}
void setStreamIndex(int step) {
if (step == 1) {
if (currentStreamIndex == MAX_STREAMS) {
currentStreamIndex = 0;
}
else {
currentStreamIndex++;
}
}
else {
// -1 which means previous
if (currentStreamIndex == 0) {
currentStreamIndex = MAX_STREAMS - 1;
}
else {
currentStreamIndex--;
}
}
}
void setHeaderTitle() {
header.setTitle(AppSettings.getStreamList().get(currentStreamIndex).getName());
}
void populateGrids() {
int pos = -1;
for (StreamGridView sgv : gridList) {
pos++;
Log.v(TAG, "Loading Stream for " + AppSettings.getStreamList().get(pos).getName() + "; Posts: " + String.valueOf(AppSettings.getStreamList().get(pos).getPosts().size()));
ArrayList<Post> posts = AppSettings.getStreamList().get(pos).getPosts();
sgv.adapter = new LazyPostItemAdapter(ListNewsActivity.this, posts, gestureListener);
sgv.gvStream.setAdapter(sgv.adapter);
}
}
class LoadStreamTask extends AsyncTask<Void, String, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_PLEASE_WAIT);
}
@Override
protected Void doInBackground(Void... unused) {
for (Stream stream : AppSettings.getStreamList()) {
if (stream.getBlogId().equalsIgnoreCase("popular")) {
stream.setPosts(Post.getPopularStream());
}
else if (stream.getBlogId().equalsIgnoreCase("recent")) {
stream.setPosts(Post.getRecentStream());
}
else {
Blog blog = Blog.getBlog(stream.getBlogId());
stream.setPosts(Post.getPostsForBlog(blog));
}
}
return null;
}
@Override
protected void onPostExecute(Void unused) {
populateGrids();
dismissDialog(DIALOG_PLEASE_WAIT);
}
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_PLEASE_WAIT:
ProgressDialog mProgressDialog;
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Loading Streams...");
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
class MyGestureDetector extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
Log.v(TAG, "onFling");
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
// right to left swipe
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
flipper.setInAnimation(slideLeftIn);
flipper.setOutAnimation(slideLeftOut);
flipper.showNext();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
flipper.setInAnimation(slideRightIn);
flipper.setOutAnimation(slideRightOut);
flipper.showPrevious();
}
} catch (Exception e) {
// nothing
}
return false;
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (gestureDetector.onTouchEvent(event))
return true;
else
return false;
}
@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onLongPress(MotionEvent e) {
// TODO Auto-generated method stub
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onShowPress(MotionEvent e) {
// TODO Auto-generated method stub
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
}
推荐答案
我不断看到了同样的滑动手势检测code遍布计算器，所以我试图把它清理干净一点。这是一个通用的监听器，可以发射在右侧或左侧刷卡事件（很容易地扩展到其他
I keep seeing the same swipe gesture detection code all over StackOverflow, so I have attempted to clean it up a bit. This is a generic listener which can fire events for right or left swipes (easily extended to other
public class SwipeListener extends GestureDetector.SimpleOnGestureListener {
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private SwipeHandler handler;
public SwipeHandler getHandler() {
return handler;
}
public void setHandler(SwipeHandler handler) {
this.handler = handler;
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
// left
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
if (handler != null) {
handler.onLeft();
return true;
}
// right
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
if (handler != null) {
handler.onRight();
return true;
}
}
return super.onFling(e1, e2, velocityX, velocityY);
}
public static abstract class SwipeHandler{
public void onLeft() {}
public void onRight() {}
}
}
然后使用这个任何地方，只需创建一个实例，设置您的刷卡事件处理程序，并将其安装在：
And then to use this anywhere, just create an instance, setup your swipe event handlers, and attach it:
SwipeListener swipeListener = new SwipeListener();
swipeListener.setHandler(new SwipeListener.SwipeHandler() {
@Override
public void onRight() {
doSomething();
}
});
someView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
});
这篇关于实现对ViewFlipper刷卡动作多GridView的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！