Android 安卓动画按钮

我正在创建一个仪表板应用程序。这就是它看起来的样子：

现在我将向你们解释它是如何工作的。当我点击向上按钮时，红色的手向上移动并停留在30。向下按钮用于将手从30向下移动到0。按钮5用于将手从0起始位置移动到5。当我点击按钮10时，它意味着它将从5移动到10。按钮-5用于将手从10向下移动到5，按钮0用于将手从5向下移动到0

这是我的代码：

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class dash1 extends Activity {
    ImageView img, img1;
    Animation an, an1, an2, an3, an4, an5;
    Button bt, bt2, bt3, bt4, bt5, bt6;

    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        img = (ImageView) findViewById(R.id.ImageView01);
        final Bitmap bmp = BitmapFactory.decodeResource(getResources(),
                R.drawable.minute);
        final int w = bmp.getWidth();
        final int h = bmp.getHeight();
        final Matrix mat = new Matrix();
        mat.postRotate(245);
        Bitmap rtd = Bitmap.createBitmap(bmp, 0, 0, w, h, mat, true);
        BitmapDrawable bmd = new BitmapDrawable(rtd);
        img.setImageDrawable(bmd);
        an = AnimationUtils.loadAnimation(this, R.anim.anim);
        an1 = AnimationUtils.loadAnimation(this, R.anim.anim1);
        an2 = AnimationUtils.loadAnimation(this, R.anim.anim2);
        an3 = AnimationUtils.loadAnimation(this, R.anim.anim3);
        an4 = AnimationUtils.loadAnimation(this, R.anim.anim4);
        an5 = AnimationUtils.loadAnimation(this, R.anim.anim5);
        bt = (Button) findViewById(R.id.Button01);
        bt2 = (Button) findViewById(R.id.Button02);
        bt3 = (Button) findViewById(R.id.Button03);
        bt4 = (Button) findViewById(R.id.Button04);
        bt5 = (Button) findViewById(R.id.Button05);
        bt6 = (Button) findViewById(R.id.Button06);
        bt.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                an.setFillAfter(true);
                img.startAnimation(an);

            }
        });

        bt2.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                img.startAnimation(an1);
            }
        });
        bt3.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                an2.setFillAfter(true);
                img.startAnimation(an2);

            }
        });
        bt4.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                an3.setFillAfter(true);
                img.startAnimation(an3);
            }
        });
        bt5.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                an2.setFillAfter(true);
                img.startAnimation(an4);
            }
        });
        bt6.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                an5.setFillAfter(true);
                img.startAnimation(an5);
            }
        });
    }
}

现在我想添加一个按钮+，而不是按钮5和按钮10，用于递增和-用于按钮5和0。我如何通过一个按钮进行增量。我不知道怎么做。在这里旋转我使用动画。这是用于旋转的xml代码。谁知道怎么做就告诉我

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <rotate android:toYScale="0.0" 
        android:pivotX="50%" 
        android:pivotY="50%" 
        android:duration="3599" 
        android:fromDegrees="0" 
        android:toDegrees="205">
     </rotate>
</set>