Walkers闪屏和引导界面

实战 Walker 之闪屏界面的实现

一、界面效果图

实现效果：当用户启动应用程序时，首先出现一闪屏界面，显示 3 秒后，跳转到主界面，这里假设
先跳转到登录界面。

二、实现过程

1、修改自动生成的 activity_welcome.xml 文件，主要代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/welcome_bg"
tools:context=".WelcomeActivity" >
</RelativeLayout>

2、修改 AndroidManifest.xml 文件，修改闪屏界面为全屏模式

<activity
android:name="cn.edu.bztc.walkersimulate.WelcomeActivity"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
android:label="@string/title_activity_welcome" >
</activity>

3、修改 WelcomeActivity，实现停顿 3 秒后跳转

方式 1：利用动画持续时间，动画结束后跳转，主要代码如下：

public class WelcomeActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
RelativeLayout layoutWelcome=(RelativeLayout) findViewById(R.id.layoutWelcome);
AlphaAnimation alphaAnimation=new AlphaAnimation(0.1f,1.0f);
alphaAnimation.setDuration(3000);
layoutWelcome.startAnimation(alphaAnimation);
alphaAnimation.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
Intent intent=new Intent(WelcomeActivity.this,LoginActivity.class);
startActivity(intent);
}
});
}
}

方式 2：使用 Handler 完成跳转

new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent intent=new Intent(WelcomeActivity.this,LoginActivity.class);
startActivity(intent);
}
},3000);

方式 3：使用多线程完成跳转

new Thread() {
public void run() {
try {
Thread.sleep(3000);
Intent intent = new Intent(WelcomeActivity.this,
LoginActivity.class);
startActivity(intent);

} catch (InterruptedException e) {
e.printStackTrace();
}
};
}.start();

实战 Walker 之引导界面的实现

一、界面效果图

实现效果：通过引导界面，用户能够快速了解应用的主要功能。当滑动到最后一个界面时，点击Go 进入到主界面。

二、实现过程

1、设计引导界面整体布局，修改自动生成的 activity_guide.xml 文件，在布局文件里首先加入 ViewPager 这个组件，然后加入加入四个 ImageView 组件，主要代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
<span style="white-space:pre"> </span>xmlns:tools="http://schemas.android.com/tools"
<span style="white-space:pre"> </span>android:layout_width="match_parent"
<span style="white-space:pre"> </span>android:layout_height="match_parent"
<span style="white-space:pre"> </span>tools:context=".GuideActivity" >
<android.support.v4.view.ViewPager
<span style="white-space:pre"> </span>android:id="@+id/vpGuide"
<span style="white-space:pre"> </span>android:layout_width="wrap_content"
<span style="white-space:pre"> </span>android:layout_height="wrap_content"
<span style="white-space:pre"> </span>android:layout_alignParentLeft="true"
<span style="white-space:pre"> </span>android:layout_alignParentTop="true" >
</android.support.v4.view.ViewPager>
<!--底部的四个圆点-->

<LinearLayout
<span style="white-space:pre"> </span>android:layout_width="wrap_content"
<span style="white-space:pre"> </span>android:layout_height="wrap_content"
<span style="white-space:pre"> </span>android:layout_alignParentBottom="true"
<span style="white-space:pre"> </span>android:layout_centerHorizontal="true"
<span style="white-space:pre"> </span>android:layout_marginBottom="40dp" >
<span style="white-space:pre"> </span><ImageView
<span style="white-space:pre">     </span>android:id="@+id/guide_dot1"
<span style="white-space:pre">     </span>android:layout_width="wrap_content"
<span style="white-space:pre">     </span>android:layout_height="wrap_content"
<span style="white-space:pre">     </span>android:background="@drawable/bg_point_selected" />
<span style="white-space:pre"> </span><ImageView
<span style="white-space:pre">     </span>android:id="@+id/guide_dot2"
<span style="white-space:pre">     </span>android:layout_width="wrap_content"
<span style="white-space:pre">     </span>android:layout_height="wrap_content"
<span style="white-space:pre">     </span>android:layout_marginLeft="10dp"
<span style="white-space:pre">     </span>android:background="@drawable/bg_point" />
<span style="white-space:pre"> </span><ImageView
<span style="white-space:pre">     </span>android:id="@+id/guide_dot3"
<span style="white-space:pre">     </span>android:layout_width="wrap_content"
<span style="white-space:pre">     </span>android:layout_height="wrap_content"
<span style="white-space:pre">     </span>android:layout_marginLeft="10dp"
<span style="white-space:pre">     </span>android:background="@drawable/bg_point" />
<span style="white-space:pre"> </span><ImageView
<span style="white-space:pre">     </span>android:id="@+id/guide_dot4"
<span style="white-space:pre">     </span>android:layout_width="wrap_content"
<span style="white-space:pre">     </span>android:layout_height="wrap_content"
<span style="white-space:pre">     </span>android:layout_marginLeft="10dp"
<span style="white-space:pre">     </span>android:background="@drawable/bg_point" />
<span style="white-space:pre"> </span></LinearLayout>
</RelativeLayout>

其中 bg_point_selected.xml 文件如下

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" >
<solid android:color="#427AB7" />
<size
android:height="8dp"
android:width="8dp" />
</shape>

bg_point.xml 文件如下

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" >

<!-- 未被选中 -->
<solid android:color="@android:color/black" />
<size
android:height="8dp"
android:width="8dp" />
</shape>

2、定义好要切换的布局文件 view1_of_pager.xml 文件、view2_of_pager.xml 文件、
view3_of_pager.xml 文件、view4_of_pager.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
<span style="white-space:pre"> </span>android:layout_width="match_parent"
<span style="white-space:pre"> </span>android:layout_height="match_parent"
<span style="white-space:pre"> </span>android:background="@drawable/guide_1"
<span style="white-space:pre"> </span>android:orientation="vertical" >
</LinearLayout>

view4_of_pager.xml 文件代码如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
<span style="white-space:pre"> </span>android:layout_width="match_parent"
<span style="white-space:pre"> </span>android:layout_height="match_parent"
<span style="white-space:pre"> </span>android:background="@drawable/guide_1"
<span style="white-space:pre"> </span>android:orientation="vertical" >
<span style="white-space:pre"> </span><TextView
<span style="white-space:pre">     </span>android:id="@+id/tvGo"
<span style="white-space:pre">     </span>android:layout_width="wrap_content"
<span style="white-space:pre">     </span>android:layout_height="wrap_content"
<span style="white-space:pre">     </span>android:layout_alignParentBottom="true"
<span style="white-space:pre">     </span>android:layout_alignParentRight="true"
<span style="white-space:pre">     </span>android:layout_marginBottom="16dp"
<span style="white-space:pre">     </span>android:layout_marginRight="19dp"
<span style="white-space:pre">     </span>android:background="@drawable/start_select"
<span style="white-space:pre">     </span>android:gravity="center"
<span style="white-space:pre">     </span>android:text="Go"
<span style="white-space:pre">     </span>android:textColor="#ffffff"
<span style="white-space:pre">     </span>android:textSize="30sp" />
</RelativeLayout>

其中 start_select.xml 文件如下

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/start_before"
android:state_pressed="false"/>

<item android:drawable="@drawable/start_after"
android:state_pressed="true"/>
</selector>

start_before.xml 文件如下：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" >
<solid android:color="#2362A7" />
<size
android:height="80dp"
android:width="80dp" />
</shape>

3、编写 GuideAdapter 类 extends PageAdapter

public class GuideAdapter extends PagerAdapter {
private List<View> views;
public GuideAdapter(List<View> views) {
this.views = views;
}
@Override
public int getCount() {
return views.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(views.get(position));
return views.get(position);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = views.get(position);
container.removeView(view);
}
}

4、修改 GuideActivity 类，代码如下：

public class GuideActivity extends Activity {
private List<View> guideViews;
private ViewPager vpGuide;
private int[] guide_dots = { R.id.guide_dot1, R.id.guide_dot2,

<pre name="code" class="java">R.id.guide_dot3, R.id.guide_dot4 };// 4 个导航点
private ImageView[] dots;
private TextView tvGo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_guide);
initGuideViews();
tvGo=(TextView) findViewById(R.id.tvGo);
initDots();
setListeners();
}
private void initDots() {
dots=new ImageView[4];
for(int i=0;i<dots.length;i++){
dots[i]=(ImageView) findViewById(guide_dots[i]);
}
}
private void setListeners() {
vpGuide.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
for (int i = 0; i < guide_dots.length; i++) {
if (position == i) {
dots[i].setImageResource(R.drawable.bg_point_selected);
} else {
dots[i].setImageResource(R.drawable.bg_point);
}
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});

tvGo.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(GuideActivity.this,LoginActivity.class);
startActivity(intent);
}
});
}
private void initGuideViews() {
vpGuide=(ViewPager) findViewById(R.id.vpGuide);
//准备好切换的 view
guideViews=new ArrayList<View>();
LayoutInflater layoutInflater=LayoutInflater.from(this);
guideViews.add(layoutInflater.inflate(R.layout.view1ofpager, null));
guideViews.add(layoutInflater.inflate(R.layout.view2ofpager, null));
guideViews.add(layoutInflater.inflate(R.layout.view3ofpager, null));
guideViews.add(layoutInflater.inflate(R.layout.view4ofpager, null));
GuideAdapter guideAdapter=new GuideAdapter(guideViews);
vpGuide.setAdapter(guideAdapter);
}
}