Android 仿余额宝数字动画效果

package com.lance.widget;

import java.text.DecimalFormat;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;

/**
 * 一、设置跳跃的帧数，setFrames(int frames)，默认是25帧 二、设置数字格式 ， setFormat(String
 * pattern)，具体查DecimalFormat类的api 三、需要动画效果用，playNumber(double
 * number)方法代替setText()方法，小数如果超过3位小数会四舍五入保留2位小数
 * 
 * @author Lance
 *
 */
public class RunningTextView extends TextView {

    public double content;// 最后显示的数字
    private int frames = 25;// 总共跳跃的帧数,默认25跳
    private double nowNumber = 0.00;// 显示的时间
    private ExecutorService thread_pool;
    private Handler handler;
    private DecimalFormat formater;// 格式化时间，保留两位小数

    public RunningTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public RunningTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public RunningTextView(Context context) {
        super(context);
        init();
    }

    public int getFrames() {
        return frames;
    }

    // 设置帧数
    public void setFrames(int frames) {
        this.frames = frames;
    }

    /**
     * 设置数字格式，具体查DecimalFormat类的api
     * @param pattern
     */
    public void setFormat(String pattern) {
        formater = new DecimalFormat(pattern);
    }

    // 初始化
    private void init() {

        thread_pool = Executors.newFixedThreadPool(2);// 2个线程的线程池
        formater = new DecimalFormat("00.00");// 最多两位小数，而且不够两位整数用0占位。可以通过setFormat再次设置   decimalformat用来格式化数字
        handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                RunningTextView.this.setText(formater.format(nowNumber)
                        .toString());// 更新显示的数字
                nowNumber += Double.parseDouble(msg.obj.toString());// 跳跃arg1那么多的数字间隔
//                Log.v("nowNumber增加之后的值", nowNumber + "");
                //
                if (nowNumber < content) {
                    Message msg2 = handler.obtainMessage();
                    msg2.obj = msg.obj;
                    handler.sendMessage(msg2);// 继续发送通知改变UI
                } else {
                    RunningTextView.this.setText(formater.format(content)
                            .toString());// 最后显示的数字，动画停止
                }
            }
        };
    }

    /**
     * 播放数字动画的方法
     *
     * @param moneyNumber
     */
    public void playNumber(double moneyNumber) {
        if (moneyNumber == 0) {
            RunningTextView.this.setText("0.00");
            return;
        }
        content = moneyNumber;// 设置最后要显示的数字
        nowNumber = 0.00;// 默认都是从0开始动画
        thread_pool.execute(new Runnable() {
            @Override
            public void run() {
                Message msg = handler.obtainMessage();
                double temp = content / frames;
                msg.obj = temp < 0.01 ? 0.01 : temp;// 如果每帧的间隔比1小，就设置为1
//                Log.v("每帧跳跃的数量：", "" + msg.obj.toString());
                handler.sendMessage(msg);// 发送通知改变UI
            }
        });
    }

}

package com.lance.runningtextview;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

    private Button mBtrmb;
    private Button mBtdollar;
    private Button mBturo;
    private com.lance.widget.RunningTextView mRunningtextview;
    private EditText mEdit;
    private Button mBtplay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bindViews();
        // 设置数字格式，具体查DecimalFormat类的api
        mRunningtextview.setFormat("00.00");
        mBtplay.setOnClickListener(this);
        mBtrmb.setOnClickListener(this);
        mBtdollar.setOnClickListener(this);
        mBturo.setOnClickListener(this);
    }

    private void bindViews() {

        mBtrmb = (Button) findViewById(R.id.btrmb);
        mBtdollar = (Button) findViewById(R.id.btdollar);
        mBturo = (Button) findViewById(R.id.bturo);
        mRunningtextview = (com.lance.widget.RunningTextView) findViewById(R.id.runningtextview);
        mEdit = (EditText) findViewById(R.id.edit);
        mBtplay = (Button) findViewById(R.id.btplay);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btplay:
            // 播放数字动画
            String temp = mEdit.getText().toString();
            Log.v("temp:", temp);
            if(!temp.equals("")){
                double number = Double.parseDouble(temp);
                mRunningtextview.playNumber(number);
            }
            break;

        case R.id.btrmb:
            Toast.makeText(this, "use the symbol ￥ ", Toast.LENGTH_SHORT).show();
            mRunningtextview.setFormat("￥00.00");
            break;
        case R.id.bturo:
            Toast.makeText(this, "use the symbol € ", Toast.LENGTH_SHORT).show();
            mRunningtextview.setFormat("€00.00");
            break;
        case R.id.btdollar:
            Toast.makeText(this, "use the symbol $ ", Toast.LENGTH_SHORT).show();
            mRunningtextview.setFormat("$00.00");
            break;
        }

    }

}