我正在使用SwipeRefreshLayout进行网页浏览,我只需在刷网页视图的顶部时刷新。有没有办法做到这一点。我有一个SwipeRefreshLayout.java类,我已经减少了REFRESH_TRIGGER_DISTANCE值,但仍然没有运气。
答案 0 :(得分:3)
为了限制某些区域的滑动处理,您只需要在SwipeRefreshLayout.onTouchEvent()
中阻止处理某些触摸事件。
例如,如果您不想在下半部分上滑动,请使用如下所示的smth:
@Override
public boolean onTouchEvent(MotionEvent event) {
final int action = event.getAction();
boolean handled = false;
switch (action) {
case MotionEvent.ACTION_DOWN: {
final MotionEvent eventCopy = MotionEvent.obtain(event);
final float eventY = eventCopy.getY();
// Handle only top half
if (eventY < (getHeight() / 2)) {
mCurrPercentage = 0;
mDownEvent = eventCopy;
mPrevY = mDownEvent.getY();
} else {
mDownEvent = null;
}
}
break;
答案 1 :(得分:2)
没有一个解决方案对我有用。但是只是这段代码。
@Override
public boolean dispatchTouchEvent(MotionEvent event)
{
super.dispatchTouchEvent(event);
int x = (int)event.getX();
int y = (int)event.getY();
if(y>800){
swipeRefreshLayout.setEnabled(false);
}else {
swipeRefreshLayout.setEnabled(true);
}
Log.e("yy",""+y);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
}
return false;
}
答案 2 :(得分:1)
使用此代码
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.swipe"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name="com.androidexample.swipescreen.SwipeScreenExample" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
SwipeScreenExample活动如下。
public class SwipeScreenExample extends Activity implements SimpleGestureListener{
private SimpleGestureFilter detector;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.swipe_screen);
// Detect touched area
detector = new SimpleGestureFilter(this,this);
}
@Override
public boolean dispatchTouchEvent(MotionEvent me){
// Call onTouchEvent of SimpleGestureFilter class
this.detector.onTouchEvent(me);
return super.dispatchTouchEvent(me);
}
@Override
public void onSwipe(int direction) {
String str = "";
switch (direction) {
case SimpleGestureFilter.SWIPE_RIGHT : str = "Swipe Right";
break;
case SimpleGestureFilter.SWIPE_LEFT : str = "Swipe Left";
break;
case SimpleGestureFilter.SWIPE_DOWN : str = "Swipe Down";
break;
case SimpleGestureFilter.SWIPE_UP : str = "Swipe Up";
break;
}
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
@Override
public void onDoubleTap() {
Toast.makeText(this, "Double Tap", Toast.LENGTH_SHORT).show();
}
}
GestureActivity如下。
public class SimpleGestureFilter extends SimpleOnGestureListener{
public final static int SWIPE_UP = 1;
public final static int SWIPE_DOWN = 2;
public final static int SWIPE_LEFT = 3;
public final static int SWIPE_RIGHT = 4;
public final static int MODE_TRANSPARENT = 0;
public final static int MODE_SOLID = 1;
public final static int MODE_DYNAMIC = 2;
private final static int ACTION_FAKE = -13; //just an unlikely number
private int swipe_Min_Distance = 100;
private int swipe_Max_Distance = 350;
private int swipe_Min_Velocity = 100;
private int mode = MODE_DYNAMIC;
private boolean running = true;
private boolean tapIndicator = false;
private Activity context;
private GestureDetector detector;
private SimpleGestureListener listener;
public SimpleGestureFilter(Activity context,SimpleGestureListener sgl) {
this.context = context;
this.detector = new GestureDetector(context, this);
this.listener = sgl;
}
public void onTouchEvent(MotionEvent event){
if(!this.running)
return;
boolean result = this.detector.onTouchEvent(event);
if(this.mode == MODE_SOLID)
event.setAction(MotionEvent.ACTION_CANCEL);
else if (this.mode == MODE_DYNAMIC) {
if(event.getAction() == ACTION_FAKE)
event.setAction(MotionEvent.ACTION_UP);
else if (result)
event.setAction(MotionEvent.ACTION_CANCEL);
else if(this.tapIndicator){
event.setAction(MotionEvent.ACTION_DOWN);
this.tapIndicator = false;
}
}
//else just do nothing, it's Transparent
}
public void setMode(int m){
this.mode = m;
}
public int getMode(){
return this.mode;
}
public void setEnabled(boolean status){
this.running = status;
}
public void setSwipeMaxDistance(int distance){
this.swipe_Max_Distance = distance;
}
public void setSwipeMinDistance(int distance){
this.swipe_Min_Distance = distance;
}
public void setSwipeMinVelocity(int distance){
this.swipe_Min_Velocity = distance;
}
public int getSwipeMaxDistance(){
return this.swipe_Max_Distance;
}
public int getSwipeMinDistance(){
return this.swipe_Min_Distance;
}
public int getSwipeMinVelocity(){
return this.swipe_Min_Velocity;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
final float xDistance = Math.abs(e1.getX() - e2.getX());
final float yDistance = Math.abs(e1.getY() - e2.getY());
if(xDistance > this.swipe_Max_Distance || yDistance > this.swipe_Max_Distance)
return false;
velocityX = Math.abs(velocityX);
velocityY = Math.abs(velocityY);
boolean result = false;
if(velocityX > this.swipe_Min_Velocity && xDistance > this.swipe_Min_Distance){
if(e1.getX() > e2.getX()) // right to left
this.listener.onSwipe(SWIPE_LEFT);
else
this.listener.onSwipe(SWIPE_RIGHT);
result = true;
}
else if(velocityY > this.swipe_Min_Velocity && yDistance > this.swipe_Min_Distance){
if(e1.getY() > e2.getY()) // bottom to up
this.listener.onSwipe(SWIPE_UP);
else
this.listener.onSwipe(SWIPE_DOWN);
result = true;
}
return result;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
this.tapIndicator = true;
return false;
}
@Override
public boolean onDoubleTap(MotionEvent arg) {
this.listener.onDoubleTap();;
return true;
}
@Override
public boolean onDoubleTapEvent(MotionEvent arg) {
return true;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent arg) {
if(this.mode == MODE_DYNAMIC){ // we owe an ACTION_UP, so we fake an
arg.setAction(ACTION_FAKE); //action which will be converted to an ACTION_UP later.
this.context.dispatchTouchEvent(arg);
}
return false;
}
static interface SimpleGestureListener{
void onSwipe(int direction);
void onDoubleTap();
}
}
我希望这对你非常有帮助,我在这里添加了左,右,上,下各个方向。
答案 3 :(得分:1)
就我而言,我保留了一个标志来决定是否必须刷新。
以XML
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/swipeId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"> ...
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout >
代码内
mSwipeRefreshLayout = findViewById(R.id.swipeId);
mSwipeRefreshLayout.setOnRefreshListener(new
SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
if (toRefresh)
startActivity(new Intent(context, LocationCurrentStatus.class));
else
mSwipeRefreshLayout.setRefreshing(false);
}
});
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
final int action = event.getAction();
boolean handled = false;
if (action == MotionEvent.ACTION_DOWN) {
final MotionEvent eventCopy = MotionEvent.obtain(event);
final float eventY = eventCopy.getY();
if (eventY > getHeight()) {
System.out.println("disabling");
toRefresh = false;
} else {
System.out.println("enabling");
toRefresh = true;
}
}
return super.dispatchTouchEvent(event);
}
private float getHeight() {
// your code to find threshold height
}