Android实现滑动效果，但是其中mActionBar.setDisplayHomeAsUpEnabled(false);这句代码报空指，怎么解决
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Android实现滑动效果，但是其中mActionBar.setDisplayHomeAsUpEnabled(false);这句代码报空指，怎么解决相关的知识，希望对你有一定的参考价值。
这是那段代码：
private void initView()
final ActionBar mActionBar = getActionBar();
mActionBar.setDisplayHomeAsUpEnabled(false);
mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mAdapter = new TabFragmentPagerAdapter(getSupportFragmentManager());
mViewPager.setAdapter(mAdapter);
mViewPager.setOnPageChangeListener(new OnPageChangeListener()
@Override
public void onPageSelected(int arg0)
mActionBar.setSelectedNavigationItem(arg0);
@Override
public void onPageScrolled(int arg0, float arg1, int arg2)
@Override
public void onPageScrollStateChanged(int arg0)
);
// 初始化 ActionBar
for (int i = 0; i < MAX_TAB_SIZE; i++)
Tab tab = mActionBar.newTab();
tab.setText(mAdapter.getPageTitle(i)).setTabListener(this);
mActionBar.addTab(tab);
Android导航菜单横向左右滑动并和下方的控件实现联动
这个是美团网个人订单的效果,找了很多地方都没找到,自己研究了两天终于弄出来了^_^,有什么问题希望大家指出来,谢谢。
实现原理是上方使用HorizontalScrollView这个可以水平横向拖动的控件,在其中加入了5个RadioButton;下方使用的是ViewPager,里面加入了7个Layout文件,其中第一个和最后一个为空,是为了实现拖到第一个屏幕的时候还能往外拖动的效果。
先看下效果,切换都是带动画效果的,并且点击上面最右边的标签时会自动滚动出后面的标签。
现在看一下代码:
package com.zj.horizontalsrollview; import java.util.ArrayList; import android.app.Activity; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup.MarginLayoutParams; import android.view.animation.Animation; import android.view.animation.AnimationSet; import android.view.animation.AnimationUtils; import android.view.animation.TranslateAnimation; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.RadioGroup.OnCheckedChangeListener; import android.widget.RelativeLayout; import android.widget.RelativeLayout.LayoutParams; /** * HorizontalScrollView和ViewPager联动效果 * 上面为HorizontalScrollView,下面为ViewPager * @author zj * 2012-5-23 下午1:07:06 */ public class MainActivity extends Activity implements OnCheckedChangeListener{ private RadioGroup mRadioGroup; private RadioButton mRadioButton1; private RadioButton mRadioButton2; private RadioButton mRadioButton3; private RadioButton mRadioButton4; private RadioButton mRadioButton5; private ImageView mImageView; private float mCurrentCheckedRadioLeft;//当前被选中的RadioButton距离左侧的距离 private HorizontalScrollView mHorizontalScrollView;//上面的水平滚动控件 private ViewPager mViewPager; //下方的可横向拖动的控件 private ArrayList<View> mViews;//用来存放下方滚动的layout(layout_1,layout_2,layout_3) @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); iniController(); iniListener(); iniVariable(); mRadioButton1.setChecked(true); mViewPager.setCurrentItem(1); mCurrentCheckedRadioLeft = getCurrentCheckedRadioLeft(); } private void iniVariable() { // TODO Auto-generated method stub mViews = new ArrayList<View>(); mViews.add(getLayoutInflater().inflate(R.layout.layout_0, null)); mViews.add(getLayoutInflater().inflate(R.layout.layout_1, null)); mViews.add(getLayoutInflater().inflate(R.layout.layout_2, null)); mViews.add(getLayoutInflater().inflate(R.layout.layout_3, null)); mViews.add(getLayoutInflater().inflate(R.layout.layout_4, null)); mViews.add(getLayoutInflater().inflate(R.layout.layout_5, null)); mViews.add(getLayoutInflater().inflate(R.layout.layout_0, null)); mViewPager.setAdapter(new MyPagerAdapter());//设置ViewPager的适配器 } /** * RadioGroup点击CheckedChanged监听 */ @Override public void onCheckedChanged(RadioGroup group, int checkedId) { AnimationSet _AnimationSet = new AnimationSet(true); TranslateAnimation _TranslateAnimation; Log.i("zj", "checkedid="+checkedId); if (checkedId == R.id.btn1) { _TranslateAnimation = new TranslateAnimation(mCurrentCheckedRadioLeft, getResources().getDimension(R.dimen.rdo1), 0f, 0f); _AnimationSet.addAnimation(_TranslateAnimation); _AnimationSet.setFillBefore(false); _AnimationSet.setFillAfter(true); _AnimationSet.setDuration(100); /*LayoutParams _LayoutParams1 = new LayoutParams(100, 4); _LayoutParams1.setMargins(0, 0, 0, 0); _LayoutParams1.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);*/ //mImageView.bringToFront(); mImageView.startAnimation(_AnimationSet);//开始上面蓝色横条图片的动画切换 //mImageView.setLayoutParams(_LayoutParams1); mViewPager.setCurrentItem(1);//让下方ViewPager跟随上面的HorizontalScrollView切换 }else if (checkedId == R.id.btn2) { _TranslateAnimation = new TranslateAnimation(mCurrentCheckedRadioLeft, getResources().getDimension(R.dimen.rdo2), 0f, 0f); _AnimationSet.addAnimation(_TranslateAnimation); _AnimationSet.setFillBefore(false); _AnimationSet.setFillAfter(true); _AnimationSet.setDuration(100); //mImageView.bringToFront(); mImageView.startAnimation(_AnimationSet); mViewPager.setCurrentItem(2); }else if (checkedId == R.id.btn3) { _TranslateAnimation = new TranslateAnimation(mCurrentCheckedRadioLeft, getResources().getDimension(R.dimen.rdo3), 0f, 0f); _AnimationSet.addAnimation(_TranslateAnimation); _AnimationSet.setFillBefore(false); _AnimationSet.setFillAfter(true); _AnimationSet.setDuration(100); //mImageView.bringToFront(); mImageView.startAnimation(_AnimationSet); mViewPager.setCurrentItem(3); }else if (checkedId == R.id.btn4) { _TranslateAnimation = new TranslateAnimation(mCurrentCheckedRadioLeft, getResources().getDimension(R.dimen.rdo4), 0f, 0f); _AnimationSet.addAnimation(_TranslateAnimation); _AnimationSet.setFillBefore(false); _AnimationSet.setFillAfter(true); _AnimationSet.setDuration(100); //mImageView.bringToFront(); mImageView.startAnimation(_AnimationSet); mViewPager.setCurrentItem(4); }else if (checkedId == R.id.btn5) { _TranslateAnimation = new TranslateAnimation(mCurrentCheckedRadioLeft, getResources().getDimension(R.dimen.rdo5), 0f, 0f); _AnimationSet.addAnimation(_TranslateAnimation); _AnimationSet.setFillBefore(false); _AnimationSet.setFillAfter(true); _AnimationSet.setDuration(100); //mImageView.bringToFront(); mImageView.startAnimation(_AnimationSet); mViewPager.setCurrentItem(5); } mCurrentCheckedRadioLeft = getCurrentCheckedRadioLeft(); Log.i("zj", "getCurrentCheckedRadioLeft="+getCurrentCheckedRadioLeft()); Log.i("zj", "getDimension="+getResources().getDimension(R.dimen.rdo2)); mHorizontalScrollView.smoothScrollTo((int)mCurrentCheckedRadioLeft-(int)getResources().getDimension(R.dimen.rdo2), 0); } /** * 获得当前被选中的RadioButton距离左侧的距离 */ private float getCurrentCheckedRadioLeft() { // TODO Auto-generated method stub if (mRadioButton1.isChecked()) { //Log.i("zj", "currentCheckedRadioLeft="+getResources().getDimension(R.dimen.rdo1)); return getResources().getDimension(R.dimen.rdo1); }else if (mRadioButton2.isChecked()) { //Log.i("zj", "currentCheckedRadioLeft="+getResources().getDimension(R.dimen.rdo2)); return getResources().getDimension(R.dimen.rdo2); }else if (mRadioButton3.isChecked()) { //Log.i("zj", "currentCheckedRadioLeft="+getResources().getDimension(R.dimen.rdo3)); return getResources().getDimension(R.dimen.rdo3); }else if (mRadioButton4.isChecked()) { //Log.i("zj", "currentCheckedRadioLeft="+getResources().getDimension(R.dimen.rdo4)); return getResources().getDimension(R.dimen.rdo4); }else if (mRadioButton5.isChecked()) { //Log.i("zj", "currentCheckedRadioLeft="+getResources().getDimension(R.dimen.rdo5)); return getResources().getDimension(R.dimen.rdo5); } return 0f; } private void iniListener() { // TODO Auto-generated method stub mRadioGroup.setOnCheckedChangeListener(this); mViewPager.setOnPageChangeListener(new MyPagerOnPageChangeListener()); } private void iniController() { // TODO Auto-generated method stub mRadioGroup = (RadioGroup)findViewById(R.id.radioGroup); mRadioButton1 = (RadioButton)findViewById(R.id.btn1); mRadioButton2 = (RadioButton)findViewById(R.id.btn2); mRadioButton3 = (RadioButton)findViewById(R.id.btn3); mRadioButton4 = (RadioButton)findViewById(R.id.btn4); mRadioButton5 = (RadioButton)findViewById(R.id.btn5); mImageView = (ImageView)findViewById(R.id.img1); mHorizontalScrollView = (HorizontalScrollView)findViewById(R.id.horizontalScrollView); mViewPager = (ViewPager)findViewById(R.id.pager); } /** * ViewPager的适配器 * @author zj * 2012-5-24 下午2:26:57 */ private class MyPagerAdapter extends PagerAdapter{ @Override public void destroyItem(View v, int position, Object obj) { // TODO Auto-generated method stub ((ViewPager)v).removeView(mViews.get(position)); } @Override public void finishUpdate(View arg0) { // TODO Auto-generated method stub } @Override public int getCount() { // TODO Auto-generated method stub return mViews.size(); } @Override public Object instantiateItem(View v, int position) { ((ViewPager)v).addView(mViews.get(position)); return mViews.get(position); } @Override public boolean isViewFromObject(View arg0, Object arg1) { // TODO Auto-generated method stub return arg0 == arg1; } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { // TODO Auto-generated method stub } @Override public Parcelable saveState() { // TODO Auto-generated method stub return null; } @Override public void startUpdate(View arg0) { // TODO Auto-generated method stub } } /** * ViewPager的PageChangeListener(页面改变的监听器) * @author zj * 2012-5-24 下午3:14:27 */ private class MyPagerOnPageChangeListener implements OnPageChangeListener{ @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } /** * 滑动ViewPager的时候,让上方的HorizontalScrollView自动切换 */ @Override public void onPageSelected(int position) { // TODO Auto-generated method stub //Log.i("zj", "position="+position); if (position == 0) { mViewPager.setCurrentItem(1); }else if (position == 1) { mRadioButton1.performClick(); }else if (position == 2) { mRadioButton2.performClick(); }else if (position == 3) { mRadioButton3.performClick(); }else if (position == 4) { mRadioButton4.performClick(); }else if (position == 5) { mRadioButton5.performClick(); }else if (position == 6) { mViewPager.setCurrentItem(5); } } } }
XML文件:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <HorizontalScrollView android:layout_width="match_parent" android:layout_height="50dp" android:fadingEdge="@null" android:scrollbars="none" android:background="#555555" android:id="@+id/horizontalScrollView" > <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:background="#33b5e5" > <RadioGroup android:id="@+id/radioGroup" android:layout_width="fill_parent" android:layout_height="49dp" android:orientation="horizontal" android:layout_alignParentTop="true" > <RadioButton style="@style/radioButton" android:text="one" android:id="@+id/btn1" /> <RadioButton style="@style/radioButton" android:text="two" android:id="@+id/btn2" /> <RadioButton style="@style/radioButton" android:text="three" android:id="@+id/btn3" /> <RadioButton style="@style/radioButton" android:text="four" android:id="@+id/btn4" /> <RadioButton style="@style/radioButton" android:text="five" android:id="@+id/btn5" /> </RadioGroup> <ImageView android:id="@+id/img1" android:layout_width="100dp" android:layout_height="4dp" android:background="#33b5e5" android:layout_alignParentBottom="true" /> </RelativeLayout> </HorizontalScrollView> <android.support.v4.view.ViewPager android:id="@+id/pager" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout>
第一次写这么多,希望转载的朋友能够尊重作者的劳动成果，加上转载地，谢谢。
http://zhengjiong.iteye.com/blog/1539951
以上是关于Android实现滑动效果，但是其中mActionBar.setDisplayHomeAsUpEnabled(false);这句代码报空指，怎么解决的主要内容，如果未能解决你的问题，请参考以下文章
Android之NineOldAndroids实现绚丽的ListView左右滑动删除Item效果