自定义view小球滑动，跳转页面

最新推荐文章于 2020-01-09 10:47:49 发布

奋斗的阿浩

最新推荐文章于 2020-01-09 10:47:49 发布

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本文链接：https://blog.youkuaiyun.com/weixin_44293974/article/details/89065270

本文介绍了一个自定义的圆形视图组件CricleView的实现方法。该组件通过继承View并重写onDraw方法来绘制一个红色圆圈，并展示了如何通过动画改变其位置和颜色。

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自定义CricleView继承一个view

package bawei.com.zhoukaodemo2;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

public class CricleView extends View {
       private Paint mPaint;

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

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

    private void init(Context context) {

         mPaint = new Paint();
          mPaint.setColor(Color.RED);
          mPaint.setAntiAlias(true);
          mPaint.setStrokeWidth(5);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

         canvas.drawCircle(50,50,50,mPaint);
    }

     public  void  setColor(int color){
         mPaint.setColor(color);
         invalidate();
     }
}

主布局main

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
//这里里不要忘记改包名，是你自己定义view的路径名
    <bawei.com.zhoukaodemo2.CricleView
         android:id="@+id/cricle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

MainActivity

package bawei.com.zhoukaodemo2;

import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Intent;
import android.graphics.Color;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Display;

public class MainActivity extends AppCompatActivity {

       private CricleView mCricleView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mCricleView = findViewById(R.id.cricle);

        int width = getWindowManager().getDefaultDisplay().getWidth();
        int height = getWindowManager().getDefaultDisplay().getHeight();
        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(mCricleView,"translationX",0,width-100);
        ObjectAnimator objectAnimator1 = ObjectAnimator.ofFloat(mCricleView,"translationY",0,height-100);

        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.play(objectAnimator).with(objectAnimator1);
        animatorSet.setDuration(3000);
         animatorSet.start();

        animatorSet.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

                    mCricleView.setColor(Color.BLUE);
            }

            @Override
            public void onAnimationEnd(Animator animation) {

                //页面跳转
                Intent intent = new Intent(MainActivity.this,LoginActivity.class);//这里自己写一个Activity就行，这里不写啦。
                 startActivity(intent);
                 finish();

            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
             mCricleView.setColor(Color.BLUE);
            }
        },1000);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                 mCricleView.setColor(Color.BLACK);
            }
        },2000);
    }

}