ViewPager实现引导界面以及进入下一个activity解决办法

来源：互联网发布：数据分析报表编辑：程序博客网时间：2024/04/29 07:19

这次项目中实现了用户引导滑动图片，到最后一张图片的时候，我认为理想的是同时具备以下两点：

1）用户可以点击上面的“开始使用”这样的按钮可以进入主界面；

2）用户接着滑动下一个图片的手势而进入主界面；

3）用户在引导界面点击返回键的时候直接进入主界面；

增加“开始使用”按钮方式：

可以定义一个layout的xml再加载：一个LinearLayout，里面一个button。默认button是“gone”，

xml如下：

[html] view plaincopy

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/guide_item"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="5" />
<Button
android:id="@+id/start"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/guide_start"
android:visibility="gone" >
</Button>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>

button上下增加了textview，我是为了控制button在整个界面的位置。

引导的图片是其背景即可。

实现如下：

guide_activity.xml

[html] view plaincopy

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<android.support.v4.view.ViewPager
android:id="@+id/guide_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>

GuideActivity.java：

[java] view plaincopy

/**
* 引导界面
* @author maria
* 2012-07-19
*/
package com.maria.test;
import java.util.ArrayList;
import java.util.List;
import com.trunkbow.talker.R;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
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.DisplayMetrics;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
public class GuideActivity extends Activity {
private ViewPager viewPager;
private List<View> mImageViews; // 滑动的图片集合
private int[] imageResId; // 图片ID
private int currentItem = 0; // 当前图片的索引号
private GestureDetector gestureDetector; // 用户滑动
/** 记录当前分页ID */
private int flaggingWidth;// 互动翻页所需滚动的长度是当前屏幕宽度的1/3
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.guide_activity);
gestureDetector = new GestureDetector(new GuideViewTouch());
// 获取分辨率
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
flaggingWidth = dm.widthPixels / 3;
imageResId = new int[] { R.drawable.guide_1, R.drawable.guide_2 };
mImageViews = new ArrayList<View>();
// 初始化图片资源
LayoutInflater viewInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// 0
View convertView0 = viewInflater.inflate(R.layout.guide_item, null);
LinearLayout linearLayout0 = (LinearLayout) convertView0
.findViewById(R.id.guide_item);
linearLayout0.setBackgroundResource(imageResId[0]);
mImageViews.add(linearLayout0);
// 1
View convertView1 = viewInflater.inflate(R.layout.guide_item, null);
LinearLayout linearLayout1 = (LinearLayout) convertView1
.findViewById(R.id.guide_item);
linearLayout1.setBackgroundResource(imageResId[1]);
Button btn = (Button) convertView1.findViewById(R.id.start);
btn.setVisibility(View.VISIBLE);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
GoToMainActivity();
}
});
mImageViews.add(linearLayout1);
viewPager = (ViewPager) findViewById(R.id.guide_view);
viewPager.setAdapter(new MyAdapter());// 设置填充ViewPager页面的适配器
// 设置一个监听器，当ViewPager中的页面改变时调用
viewPager.setOnPageChangeListener(new MyPageChangeListener());
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
event.setAction(MotionEvent.ACTION_CANCEL);
}
return super.dispatchTouchEvent(event);
}
private class GuideViewTouch extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
if (currentItem == 1) {
if (Math.abs(e1.getX() - e2.getX()) > Math.abs(e1.getY()
- e2.getY())
&& (e1.getX() - e2.getX() <= (-flaggingWidth) || e1
.getX() - e2.getX() >= flaggingWidth)) {
if (e1.getX() - e2.getX() >= flaggingWidth) {
GoToMainActivity();
return true;
}
}
}
return false;
}
}
/**
* 进入主界面
*/
void GoToMainActivity() {
Intent i = new Intent(GuideActivity.this, MainActivivty.class);
startActivity(i);
finish();
}
/**
* 当ViewPager中页面的状态发生改变时调用
*
* @author Administrator
*
*/
private class MyPageChangeListener implements OnPageChangeListener {
/**
* This method will be invoked when a new page becomes selected.
* position: Position index of the new selected page.
*/
public void onPageSelected(int position) {
currentItem = position;
}
public void onPageScrollStateChanged(int arg0) {
}
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
}
/**
* 填充ViewPager页面的适配器
*
* @author Administrator
*
*/
private class MyAdapter extends PagerAdapter {
@Override
public int getCount() {
return imageResId.length;
}
@Override
public Object instantiateItem(View arg0, int arg1) {
((ViewPager) arg0).addView(mImageViews.get(arg1));
return mImageViews.get(arg1);
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View arg0) {
}
@Override
public void finishUpdate(View arg0) {
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
GoToMainActivity();
return false;
}
return super.onKeyDown(keyCode, event);
}
}