TextSwitcher(文本切换器)和ViewFlipper

1.TextSwitcher

使用：

应用分为三步：
1.得到 TextSwitcher 实例对象
  TextSwitcher switcher = (TextSwitcher) findViewById(R.id.textSwitcher);
2.为switcher指定ViewSwitcher.ViewFactory工厂，该工厂会产生出转换时需要的View
  switcher.setFactory(this);
3.为switcher设定显示的内容，该方法执行，就会切换到下个View
  switcher.setText(String.valueOf(new Random().nextInt()));

2.ViewFlipper

实现：

①创建主布局文件，包含ViewFlipper控件（从源码来看，ViewFlipper控件是集成FrameLayout，也是相当于一个帧布局，只是包含了一些特殊的属性）

②创建ViewFlipper的子View，就是两个LinearLayout（里面包含两个TextView）

③创建ViewFlipper中子view的进入和退出动画anim_in和anim_out两个动画文件

④在Activity中将两个子View添加到ViewFlipper中去，调动的是ViewFlipper的addView方法

具体代码：

①创建主布局文件

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.qianmo.rollads.MainActivity">
 
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">
 
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay"/>
 
    </android.support.design.widget.AppBarLayout>
 
    <RelativeLayout
        android:id="@+id/content_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:context="com.qianmo.rollads.MainActivity"
        tools:showIn="@layout/activity_main">
 
        <ViewFlipper
            android:id="@+id/viewFlipper"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:autoStart="true"
            android:background="#fff"
            android:flipInterval="3000"
            android:inAnimation="@anim/anim_in"
            android:outAnimation="@anim/anim_out"
            android:paddingLeft="30dp"
            >
        </ViewFlipper>
    </RelativeLayout>
    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_dialog_email"/>
 
</android.support.design.widget.CoordinatorLayout>

②创建ViewFlipper的子View，这里有两个，我就只给出一个来了，另一个是一样的

one_ads.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"
              android:padding="8dp"
    >
 
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        >
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="热议"
            android:textColor="#F14C00"
            android:textSize="12sp"
            android:background="@drawable/bg"
            />
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:padding="3dp"
            android:singleLine="true"
            android:text="小米8问世，雷胖子现在笑的开心了啦！"
            android:textColor="#333"
            android:textSize="16sp"
            />
 
    </LinearLayout>
 
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        >
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="热议"
            android:textColor="#F14C00"
            android:textSize="12sp"
            android:background="@drawable/bg"
            />
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:padding="3dp"
            android:singleLine="true"
            android:text="取了个漂亮的媳妇，整的是好开心！"
            android:textColor="#333"
            android:textSize="16sp"
            />
 
    </LinearLayout>
 
</LinearLayout>

③创建ViewFlipper中子view的进入和退出动画anim_in和anim_out两个动画文件,这里也只给出anim_in的代码，anim_out代码是类似的

anim_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="1500"
        android:fromYDelta="100%p"
        android:toYDelta="0"
        />
</set>

④在Activity中将两个子View添加到ViewFlipper中去，调动的是ViewFlipper的addView方法

　　MainActivity.java

package com.qianmo.rollads;
 
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ViewFlipper;
 
public class MainActivity extends AppCompatActivity {
 
    private ViewFlipper viewFlipper;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        viewFlipper = (ViewFlipper) findViewById(R.id.viewFlipper);
        setSupportActionBar(toolbar);
 
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
 
        viewFlipper.addView(View.inflate(this, R.layout.one_ads, null));
        viewFlipper.addView(View.inflate(this, R.layout.two_ads, null));
    }

}

ok，来看一下我们的效果