我想在某一页面加入ViewPager左右切换activity页面切换
由于不知道怎么用 百度了一堆代码 找了个比较合适的 加入进去 发现代码是三个activity的切换 但我加入第四个页面切换的时候就出错了 这是为什么?
请教各位大牛
由于不知道怎么用 百度了一堆代码 找了个比较合适的 加入进去 发现代码是三个activity的切换 但我加入第四个页面切换的时候就出错了 这是为什么?
请教各位大牛
@SuppressWarnings("deprecation")
public class MovingActivity 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.moving);
context = MovingActivity.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, SetUp1Activity.class);
list.add(getView("A", intent));
Intent intent2 = new Intent(context, SetUp2Activity.class);
list.add(getView("B", intent2));
Intent intent3 = new Intent(context, SetUp3Activity.class);
list.add(getView("C", intent3));
Intent intent4 = new Intent(context, SetUp4Activity.class);
list.add(getView("D", intent4));
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.bg_selected)
.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 / 4 - bmpW) / 3;// 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.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
int three=one * 3;
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(three, 0, 0, 0);
}
break;
case 1:
if (currIndex == 0) {
animation = new TranslateAnimation(offset, one, 0, 0);
} else if (currIndex == 2) {
animation = new TranslateAnimation(two, one, 0, 0);
}
break;
case 2:
if (currIndex == 0) {
animation = new TranslateAnimation(offset, two, 0, 0);
} else if (currIndex == 1) {
animation = new TranslateAnimation(one, two, 0, 0);
}
break;
case 3:
if (currIndex == 0) {
animation = new TranslateAnimation(offset, three, 0, 0);
} else if (currIndex == 1) {
animation = new TranslateAnimation(one, three, 0, 0);
}
break;
}
//Animation animation = new TranslateAnimation(one*currIndex, one*arg0, 0, 0);
currIndex = arg0;
animation.setFillAfter(true);// True:图片停在动画结束位置
animation.setDuration(300);
cursor.startAnimation(animation);
}
public void onPageScrollStateChanged(int arg0) {
}
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;
}
public void onClick(View v) {
pager.setCurrentItem(index);
}
};
}
本文介绍了一个使用ViewPager实现多个Activity页面切换的例子。通过LocalActivityManager管理多个活动,并利用PagerAdapter为ViewPager提供页面数据。文章还详细展示了如何添加动画效果来增强用户体验。
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