控件：文本切换 TextSwitcher

◆TextSwitcher和ViewFactory的使用

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/MyLayout"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextSwitcher
        android:id="@+id/myTextSwitcher"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/but"
        android:text="显示当前时间"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher.ViewFactory;

public class MyTextSwitcherDemo extends Activity {
    // 文字切换
    private TextSwitcher txtsw = null;        
    // 按钮组件
    private Button but = null;    
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 调用布局管理器
        super.setContentView(R.layout.main);                        
        this.txtsw = (TextSwitcher) super.findViewById(R.id.myTextSwitcher) ;
        // 取得组件
        this.but = (Button) super.findViewById(R.id.but) ;        
        // 设置转换工厂
        this.txtsw.setFactory(new ViewFactoryImpl());    
        // 设置动画
        this.txtsw.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in)); 
        // 设置动画
        this.txtsw.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));
        // 定义监听
        this.but.setOnClickListener(new OnClickListenerImpl()) ;    
    }
    
    private class OnClickListenerImpl implements OnClickListener {
        @Override
        public void onClick(View v) {
            MyTextSwitcherDemo.this.txtsw.setText("当前时间为："
                    + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS")
                            .format(new Date())); // 显示当前时间
            
        }
    }
    private class ViewFactoryImpl implements ViewFactory {
        @Override
        public View makeView() {
            // 实例化图片显示
            TextView txt = new TextView(MyTextSwitcherDemo.this);
            // 设置背景颜色
            txt.setBackgroundColor(0xFFFFFFFF);                        
            txt.setTextColor(0xFF000000) ;
            // 自适应图片大小
            txt.setLayoutParams(new TextSwitcher.LayoutParams(        
                    LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
            // 文字大小
            txt.setTextSize(30) ;                                    
            return txt;
        }
        
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="org.lxh.demo"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="3" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MyTextSwitcherDemo"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>

                 

 TextSwitcher与ImageSwitcher一样，

如果需要切换都必须通过ViewFactory接口设置。