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package com.xiaolongtongxue.vp1;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
/**
* A customized view pager which listens when user is interacting with itself.
*/
public class InteractingListenViewPager extends ViewPager {
public InteractingListenViewPager(Context context) {
super(context);
}
public InteractingListenViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
if (interactingListener != null) {
interactingListener.on();
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
if (interactingListener != null) {
interactingListener.off();
}
break;
}
return super.onTouchEvent(ev);
}
private InteractingListener interactingListener;
public void setInteractingListener(InteractingListener interactingListener) {
this.interactingListener = interactingListener;
}
public interface InteractingListener {
/** user is interacting with the view pager */
void on();
/** user has no interactions with the view pager */
void off();
}
}
package com.xiaolongtongxue.vp1;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v7.app.AppCompatActivity;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private static final int DELAY_MILLIS = 2000;
private InteractingListenViewPager viewPager;
private Runnable timer = new Runnable() {
@Override public void run() {
viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);
viewPager.postDelayed(this, DELAY_MILLIS);
}
};
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_pager);
viewPager = (InteractingListenViewPager) findViewById(R.id.view_pager);
viewPager.setPageMargin((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8, getResources().getDisplayMetrics()));
viewPager.setAdapter(new SimpleAdapter());
viewPager.setInteractingListener(new InteractingListenViewPager.InteractingListener() {
@Override public void on() {
viewPager.removeCallbacks(timer);
}
@Override public void off() {
viewPager.postDelayed(timer, DELAY_MILLIS);
}
});
}
@Override protected void onResume() {
super.onResume();
viewPager.postDelayed(timer, DELAY_MILLIS);
}
@Override protected void onPause() {
super.onPause();
viewPager.removeCallbacks(timer);
}
static class SimpleAdapter extends PagerAdapter {
private static final int[] COLORS = new int[]{
Color.parseColor("#673AB7"),
Color.parseColor("#FF5722"),
Color.parseColor("#E91E63"),
};
private static final int REAL_COUNT = COLORS.length;
private final String[] strings;
public SimpleAdapter() {
strings = new String[REAL_COUNT];
for (int i = 0; i < REAL_COUNT; i++) {
strings[i] = String.format("Page %d", i);
}
}
@Override public int getCount() {
return Integer.MAX_VALUE;
}
@Override public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override public Object instantiateItem(ViewGroup container, int position) {
final int i = position % REAL_COUNT;
final Context context = container.getContext();
TextView tv = new TextView(context);
tv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
tv.setGravity(Gravity.CENTER);
tv.setTextColor(Color.WHITE);
tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 24);
tv.setBackgroundColor(COLORS[i]);
tv.setText(strings[i]);
container.addView(tv);
return tv;
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<com.xiaolongtongxue.vp1.InteractingListenViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
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