基础教程安卓Tab页面手势滑动切换以及动画效果-安卓笔记

安卓Tab页面手势滑动切换以及动画效果

2022-05-20 18:29:08

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001/**002* Tab页面手势滑动切换以及动画效果003*004* @author D.Winter005*006*/007public class dd extends Activity {008// ViewPager是google SDk中自带的一个附加包的一个类，可以用来实现屏幕间的切换。009// android-support-v4.jar010private ViewPager mPager;//页…

001

/**

002	* Tab页面手势滑动切换以及动画效果

003

004	* <span>@author</span> D.Winter

005

006

007	public class dd extends Activity {

008	// ViewPager是google SDk中自带的一个附加包的一个类，可以用来实现屏幕间的切换。

009	// android-support-v4.jar

010	private ViewPager mPager;//页卡内容

011	private List<View> listViews; // Tab页面列表

012	private ImageView cursor;// 动画图片

013	private TextView t1, t2, t3;// 页卡头标

014	private int offset = 0;// 动画图片偏移量

015	private int currIndex = 0;// 当前页卡编号

016	private int bmpW;// 动画图片宽度

017

018

@Override

019	public void onCreate(Bundle savedInstanceState) {

020	super.onCreate(savedInstanceState);

021	setContentView(R.layout.main);

022	InitImageView();

023	InitTextView();

024	InitViewPager();

025

}

026

027

/**

028

* 初始化头标

029

030	private void InitTextView() {

031	t1 = (TextView) findViewById(R.id.text1);

032	t2 = (TextView) findViewById(R.id.text2);

033	t3 = (TextView) findViewById(R.id.text3);

034

035	t1.setOnClickListener(new MyOnClickListener(0));

036	t2.setOnClickListener(new MyOnClickListener(1));

037	t3.setOnClickListener(new MyOnClickListener(2));

038

}

039

040

/**

041	* 初始化ViewPager

042

043	private void InitViewPager() {

044	mPager = (ViewPager) findViewById(R.id.vPager);

045	listViews = new ArrayList<View>();

046	LayoutInflater mInflater = getLayoutInflater();

047	listViews.add(mInflater.inflate(R.layout.lay1, null));

048	listViews.add(mInflater.inflate(R.layout.lay2, null));

049	listViews.add(mInflater.inflate(R.layout.lay3, null));

050	mPager.setAdapter(new MyPagerAdapter(listViews));

051	mPager.setCurrentItem(0);

052	mPager.setOnPageChangeListener(new MyOnPageChangeListener());

053

}

054

055

/**

056

* 初始化动画

057

058	private void InitImageView() {

059	cursor = (ImageView) findViewById(R.id.cursor);

060	bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.a)

061	.getWidth();// 获取图片宽度

062	DisplayMetrics dm = new DisplayMetrics();

063	getWindowManager().getDefaultDisplay().getMetrics(dm);

064	int screenW = dm.widthPixels;// 获取分辨率宽度

065	offset = (screenW / 3 - bmpW) / 2;// 计算偏移量

066	Matrix matrix = new Matrix();

067	matrix.postTranslate(offset, 0);

068	cursor.setImageMatrix(matrix);// 设置动画初始位置

069

}

070

071

/**

072	* ViewPager适配器

073

074	public class MyPagerAdapter extends PagerAdapter {

075	public List<View> mListViews;

076

077	public MyPagerAdapter(List<View> mListViews) {

078	this.mListViews = mListViews;

079

}

080

081

@Override

082	public void destroyItem(View arg0, int arg1, Object arg2) {

083	((ViewPager) arg0).removeView(mListViews.get(arg1));

084

}

085

086

@Override

087	public void finishUpdate(View arg0) {

088

}

089

090

@Override

091	public int getCount() {

092	return mListViews.size();

093

}

094

095

@Override

096	public Object instantiateItem(View arg0, int arg1) {

097	((ViewPager) arg0).addView(mListViews.get(arg1), 0);

098	return mListViews.get(arg1);

099

}

100

101

@Override

102	public boolean isViewFromObject(View arg0, Object arg1) {

103	return arg0 == (arg1);

104

}

105

106

@Override

107	public void restoreState(Parcelable arg0, ClassLoader arg1) {

108

}

109

110

@Override

111	public Parcelable saveState() {

112	return null;

113

}

114

115

@Override

116	public void startUpdate(View arg0) {

117

}

118

}

119

120

/**

121

* 头标点击监听

122

123	public class MyOnClickListener implements View.OnClickListener {

124	private int index = 0;

125

126	public MyOnClickListener(int i) {

127	index = i;

128

}

129

130

@Override

131	public void onClick(View v) {

132	mPager.setCurrentItem(index);

133

}

134

};

135

136

/**

137

* 页卡切换监听

138

139	public class MyOnPageChangeListener implements OnPageChangeListener {

140

141	int one = offset * 2 + bmpW;// 页卡1 -> 页卡2 偏移量

142	int two = one * 2;// 页卡1 -> 页卡3 偏移量

143

144

@Override

145	public void onPageSelected(int arg0) {

146	Animation animation = null;

147	switch (arg0) {

148

case 0:

149	if (currIndex == 1) {

150	animation = new TranslateAnimation(one, 0, 0, 0);

151	} else if (currIndex == 2) {

152	animation = new TranslateAnimation(two, 0, 0, 0);

153

}

154

break;

155

case 1:

156	if (currIndex == 0) {

157	animation = new TranslateAnimation(offset, one, 0, 0);

158	} else if (currIndex == 2) {

159	animation = new TranslateAnimation(two, one, 0, 0);

160

}

161

break;

162

case 2:

163	if (currIndex == 0) {

164	animation = new TranslateAnimation(offset, two, 0, 0);

165	} else if (currIndex == 1) {

166	animation = new TranslateAnimation(one, two, 0, 0);

167

}

168

break;

169

}

170	currIndex = arg0;

171	animation.setFillAfter(true);// True:图片停在动画结束位置

172	animation.setDuration(300);

173	cursor.startAnimation(animation);

174

}

175

176

@Override

177	public void onPageScrolled(int arg0, float arg1, int arg2) {

178

}

179

180

@Override

181	public void onPageScrollStateChanged(int arg0) {

182

}

183

}

184

}

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