Android上下翻滚的公告

效果图：
 

添加工具类 VerticalTextview ：
 

import android.content.Context;
import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher;

import java.util.ArrayList;

/**
 * Name: 吴庆森
 * Date: 2019/4/18
 * Mailbox: [e-mail]
 * Describe:上下滚动的TextView
 */
public class VerticalTextview extends TextSwitcher implements ViewSwitcher.ViewFactory  {

    private static final int FLAG_START_AUTO_SCROLL = 0;
    private static final int FLAG_STOP_AUTO_SCROLL = 1;

    private float mTextSize = 25 ;
    private int mPadding = 5;
    private int textColor = Color.BLACK;

    /**
     * @param textSize 字号
     * @param padding 内边距
     * @param textColor 字体颜色
     */
    public void setText(float textSize,int padding,int textColor) {
        mTextSize = textSize;
        mPadding = padding;
        this.textColor = textColor;
    }

    private OnItemClickListener itemClickListener;
    private Context mContext;
    private int currentId = -1;
    private ArrayList<String> textList;
    private Handler handler;

    public VerticalTextview(Context context) {
        this(context, null);
        mContext = context;
    }

    public VerticalTextview(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        textList = new ArrayList<String>();
    }

    public void setAnimTime(long animDuration) {
        setFactory(this);
        Animation in = new TranslateAnimation(0, 0, animDuration, 0);
        in.setDuration(animDuration);
        in.setInterpolator(new AccelerateInterpolator());
        Animation out = new TranslateAnimation(0, 0, 0, -animDuration);
        out.setDuration(animDuration);
        out.setInterpolator(new AccelerateInterpolator());
        setInAnimation(in);
        setOutAnimation(out);
    }

    /**
     * 间隔时间
     * @param time
     */
    public void setTextStillTime(final long time){
        handler =new Handler() {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case FLAG_START_AUTO_SCROLL:
                        if (textList.size() > 0) {
                            currentId++;
                            setText(textList.get(currentId % textList.size()));
                        }
                        handler.sendEmptyMessageDelayed(FLAG_START_AUTO_SCROLL,time);
                        break;
                    case FLAG_STOP_AUTO_SCROLL:
                        handler.removeMessages(FLAG_START_AUTO_SCROLL);
                        break;
                }
            }
        };
    }
    /**
     * 设置数据源
     * @param titles
     */
    public void setTextList(ArrayList<String> titles) {
        textList.clear();
        textList.addAll(titles);
        currentId = -1;
    }

    /**
     * 开始滚动
     */
    public void startAutoScroll() {
        handler.sendEmptyMessage(FLAG_START_AUTO_SCROLL);
    }

    /**
     * 停止滚动
     */
    public void stopAutoScroll() {
        handler.sendEmptyMessage(FLAG_STOP_AUTO_SCROLL);
    }

    @Override
    public View makeView() {
        TextView t = new TextView(mContext);
        t.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        t.setMaxLines(1);
        t.setPadding(mPadding, mPadding, mPadding, mPadding);
        t.setTextColor(textColor);
        t.setTextSize(mTextSize);

        t.setClickable(true);
        t.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (itemClickListener != null && textList.size() > 0 && currentId != -1) {
                    itemClickListener.onItemClick(currentId % textList.size());
                }
            }
        });
        return t;
    }

    /**
     * 设置点击事件监听
     * @param itemClickListener
     */
    public void setOnItemClickListener(OnItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    /**
     * 轮播文本点击监听器
     */
    public interface OnItemClickListener {
        /**
         * 点击回调
         * @param position 当前点击ID
         */
        void onItemClick(int position);
    }

}

 

activity_main.xml 文件中代码为：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <com.example.languagemore.VerticalTextview
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

 

MainActivity 中的代码：

public class MainActivity extends AppCompatActivity {
    private ArrayList titleList;
    private VerticalTextview mTextview;

    @Override
    protected void onResume() {
        super.onResume();
        if (mTextview != null) {
            mTextview.startAutoScroll();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //开始
        mTextview.startAutoScroll();
    }

    private void init() {
        mTextview = (VerticalTextview) findViewById(R.id.textview);
        titleList = new ArrayList<>();
        titleList.add("2.4版本更新");
        titleList.add("哈哈哈哈哈哈");
        titleList.add("水水水水水水水水水水");
        mTextview.setTextList(titleList);
        mTextview.setText(25, 5, Color.RED);//设置属性
        mTextview.setTextStillTime(3000);//设置停留时长间隔
        mTextview.setAnimTime(300);//设置进入和退出的时间间隔
        mTextview.setOnItemClickListener(new VerticalTextview.OnItemClickListener() {
            @Override
            public void onItemClick(int position) {
                Toast.makeText(MainActivity.this, "点击了 : " + titleList.get(position), Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    protected void onPause() {
        super.onPause();
        mTextview.stopAutoScroll();
    }
}

这样就可以达到上图中的效果了。