求教各位大神，下面的是我的一个ViewPager的安卓小程序，如大家所见现在这个android代码是能正常运行的，但当我将代码中所有父类 ”ViewPager“ 换成 子类
”NoScrollViewPager“ 后，程序一打开就闪退。。。
为啥换了个子类就会闪退啊。。。
package com.example.testviewpagerandtabhost;
public class MainActivity extends Activity {
Context context = null;
LocalActivityManager manager = null;
ViewPager pager = null;
TabHost tabHost = null;
TextView t1,t2,t3;
private int offset = 0;// 动画图片偏移量
private int currIndex = 0;// 当前页卡编号
private int bmpW;// 动画图片宽度
private ImageView cursor;// 动画图片
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = MainActivity.this;
manager = new LocalActivityManager(this , true);
manager.dispatchCreate(savedInstanceState);
InitImageView();
initTextView();
initPagerViewer();
}
/**
* 初始化标题
*/
private void initTextView() {
t1 = (TextView) findViewById(R.id.text1);
t2 = (TextView) findViewById(R.id.text2);
t3 = (TextView) findViewById(R.id.text3);
t1.setOnClickListener(new MyOnClickListener(0));
t2.setOnClickListener(new MyOnClickListener(1));
t3.setOnClickListener(new MyOnClickListener(2));
}
/**
* 初始化PageViewer
*/
private void initPagerViewer() {
pager = ((ViewPager) findViewById(R.id.viewpage));
final ArrayList<View> list = new ArrayList<View>();
Intent intent = new Intent(context, A.class);
list.add(getView("A", intent));
Intent intent2 = new Intent(context, B.class);
list.add(getView("B", intent2));
Intent intent3 = new Intent(context, C.class);
list.add(getView("C", intent3));
pager.setAdapter(new MyPagerAdapter(list));
pager.setCurrentItem(0);
pager.setOnPageChangeListener(new MyOnPageChangeListener());
}
/**
* 初始化动画
*/
private void InitImageView() {
cursor = (ImageView) findViewById(R.id.cursor);
bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.roller)
.getWidth();// 获取图片宽度
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenW = dm.widthPixels;// 获取分辨率宽度
offset = (screenW / 3 - bmpW) / 2;// 计算偏移量
Matrix matrix = new Matrix();
matrix.postTranslate(offset, 0);
cursor.setImageMatrix(matrix);// 设置动画初始位置
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
/**
* 通过activity获取视图
* @param id
* @param intent
* @return
*/
private View getView(String id, Intent intent) {
return manager.startActivity(id, intent).getDecorView();
}
/**
* Pager适配器
*/
public class MyPagerAdapter extends PagerAdapter{
List<View> list = new ArrayList<View>();
public MyPagerAdapter(ArrayList<View> list) {
this.list = list;
}
@Override
public void destroyItem(ViewGroup container, int position,
Object object) {
ViewPager pViewPager = ((ViewPager) container);
pViewPager.removeView(list.get(position));
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object instantiateItem(View arg0, int arg1) {
ViewPager pViewPager = ((ViewPager) arg0);
pViewPager.addView(list.get(arg1));
return list.get(arg1);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View arg0) {
}
}
/**
* 页卡切换监听
*/
public class MyOnPageChangeListener implements OnPageChangeListener {
int one = offset * 2 + bmpW;// 页卡1 -> 页卡2 偏移量
int two = one * 2;// 页卡1 -> 页卡3 偏移量
@Override
public void onPageSelected(int arg0) {
Animation animation = null;
switch (arg0) {
case 0:
if (currIndex == 1) {
animation = new TranslateAnimation(one, 0, 0, 0);
} else if (currIndex == 2) {
animation = new TranslateAnimation(two, 0, 0, 0);
}
break;
case 1:
if (currIndex == 0) {
animation = new TranslateAnimation(0, one, 0, 0);
} else if (currIndex == 2) {
animation = new TranslateAnimation(two, one, 0, 0);
}
break;
case 2:
if (currIndex == 0) {
animation = new TranslateAnimation(0, two, 0, 0);
} else if (currIndex == 1) {
animation = new TranslateAnimation(one, two, 0, 0);
}
break;
}
currIndex = arg0;
animation.setFillAfter(true);// True:图片停在动画结束位置
animation.setDuration(300);
cursor.startAnimation(animation);
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
}
/**
* 头标点击监听
*/
public class MyOnClickListener implements View.OnClickListener {
private int index = 0;
public MyOnClickListener(int i) {
index = i;
}
@Override
public void onClick(View v) {
pager.setCurrentItem(index);
}
};
public class NoScrollViewPager extends ViewPager {
public NoScrollViewPager(Context context) {
super(context);
// TODO 自动生成的构造函数存根
}
private boolean noScroll = false;
public void setNoScroll(boolean noScroll) {
this.noScroll = noScroll;
}
@Override
public void scrollTo(int x, int y) {
super.scrollTo(x, y);
}
@Override
public boolean onTouchEvent(MotionEvent arg0) {
/* return false;//super.onTouchEvent(arg0); */
if (noScroll)
return false;
else
return super.onTouchEvent(arg0);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent arg0) {
if (noScroll)
return false;
else
return super.onInterceptTouchEvent(arg0);
}
@Override
public void setCurrentItem(int item, boolean smoothScroll) {
super.setCurrentItem(item, smoothScroll);
}
@Override
public void setCurrentItem(int item) {
super.setCurrentItem(item);
}
}
}
