Android TextSwitcher实现文字轮播效果

TextSwitcher实现文字轮播效果

今天看到bdmh的TextSwitcher实现文字上下翻牌效果，觉得是个很有用的实现。由于原文中没有给出源码，所以参考着写了个demo。现在写在这里权当一个笔记和分享，以后有需要时可以拿来用。

• 文字上下滚动效果
• 自动轮播

---

layout代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/main_bg_color" >

    <include layout="@layout/title_bar_view"/>

    <TextSwitcher
        android:id="@+id/textswitcher"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dip"
        android:layout_marginRight="20dip"
        android:layout_marginTop="80dip"/>

LinearLayout>

其中的title_bar_view是一个很简单的标题栏布局，代码就不给出了。

Activity代码

package com.app.acoe.demo.activity;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher.ViewFactory;

import com.app.acoe.demo.R;

/**
 * @author Acoe
 * @date 2016-3-23
 * @version V1.0.0
 */
public class TextSwitcherDemoActivity extends Activity {
    private TextView txtTitle;
    private TextSwitcher txtSwitcher;

    private String[] items;
    private int i = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.text_switcher_demo_activity);

        initUI();
    }

    /**
     * 
     */
    private void initUI() {
        // 设置标题
        this.txtTitle = (TextView) findViewById(R.id.title_textview);
        this.txtTitle.setText("TextSwitcher");
        // 控件
        txtSwitcher = (TextSwitcher) findViewById(R.id.textswitcher);
        txtSwitcher.setFactory(new ViewFactory() {
            @Override
            public View makeView() {
                TextView tv = new TextView(getApplication());
                tv.setTextSize(getResources().getDimension(R.dimen.dimen_16));
                tv.setTextColor(getResources().getColor(R.color.normal_text_color));
                return tv;
            }
        });
        txtSwitcher.setInAnimation(getApplicationContext(), R.anim.slide_in_bottom);
        txtSwitcher.setOutAnimation(getApplicationContext(), R.anim.slide_out_top);
        items = new String[] { "新春特别活动，楚舆狂歌套限时出售！", "三周年红发效果图放出！", "冬至趣味活动开启，一起来吃冬至宴席。" };
        Message msg = mHandler.obtainMessage(1);
        msg.what = i;
        mHandler.sendMessage(msg);
    }

    private Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            txtSwitcher.setText(items[i % items.length]);
            i++;
            Message msgg = mHandler.obtainMessage(1);
            msgg.what = i;
            mHandler.sendMessageDelayed(msgg, 3000);
        }
    };
}

用到的两个动画文件

slide_in_bottom

<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true"
    android:shareInterpolator="false"
    android:zAdjustment="top">

    <translate 
        android:duration="1000"
        android:fromYDelta="100%p"
        android:toYDelta="0"/>

set>

slide_out_top

<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true"
    android:shareInterpolator="false"
    android:zAdjustment="top">

    <translate 
        android:duration="1000"
        android:fromYDelta="0"
        android:toYDelta="-100%p"/>

set>