安卓 水波纹emmm

WaterView//自定义View

package com.example.dell.ds_week01_lx01;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

public class WaterView extends View {
    private Paint paintTop,paintBottom;
    private Path pathBottom,pathTop;
    private float φ;

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

    public WaterView(Context context, @Nullable AttributeSet attrs) {
        super( context, attrs );
        init(context);
    }

    public WaterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super( context, attrs, defStyleAttr );
        init(context);
    }

    private void init(Context context) {
        paintTop = new Paint();
        paintTop.setColor( Color.WHITE );
        paintTop.setAntiAlias( true );



        //创建画笔
        paintBottom = new Paint();
        //设置颜色为蓝色
        paintBottom.setColor( Color.WHITE );
        //设置抗锯齿为true
        paintBottom.setAntiAlias( true );
        paintBottom.setAlpha( 60 );

        pathTop = new Path();
        pathBottom = new Path();
    }

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

//设置路径其实位置
        pathTop.moveTo( getLeft(),getBottom() );
        pathBottom.moveTo( getLeft(),getBottom() );

        φ-=0.1f;

        double pi = Math.PI * 2 / getWidth();
//设置路径移动的坐标
        for ( float x=0;x<getWidth();x+=20){
            float y = (float) (10*Math.cos( pi*x+φ )+10 );
            pathTop.lineTo( x,y );
            pathBottom.lineTo(x, (float) (10*Math.sin(pi*x+φ)));

            listener.animation(y);
        }
//设置路径结束位置
        pathTop.lineTo( getRight(),getBottom() );
        pathBottom.lineTo( getRight(),getBottom() );

//设置绘制路径
        canvas.drawPath( pathTop,paintTop );
        canvas.drawPath( pathBottom,paintBottom );

        postInvalidateDelayed( 20 );
    }
    private AnimationListener listener;

    //传递接口
    public void animation(AnimationListener listener){
        this.listener=listener;
    }

    public interface AnimationListener{
        void animation(float y);
    }

}

//布局界面

<?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=".WaterActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:background="#d43c3c">

        <ImageView
            android:id="@+id/login"
            android:layout_centerHorizontal="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@+id/water"
            android:src="@mipmap/ic_launcher_round" />

        <com.example.dell.ds_week01_lx01.WaterView
            android:id="@+id/water"
            android:layout_width="match_parent"
            android:layout_height="20dp"
            android:layout_alignParentBottom="true" />
    </RelativeLayout>
</RelativeLayout>

 

//WaterActivity 页面

package com.example.dell.ds_week01_lx01;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class WaterActivity extends AppCompatActivity {

    private WaterView water;

    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_water );

        final ImageView image = (ImageView) findViewById( R.id.login );

        water = (WaterView) findViewById( R.id.water );
        final RelativeLayout.LayoutParams params= (RelativeLayout.LayoutParams) image.getLayoutParams();
        water.animation( new WaterView.AnimationListener() {
            @Override
            public void animation(float y) {
                params.setMargins( 0,0,0, (int) y );
                image.setLayoutParams( params );
            }
        } );
    }
}

//activity_main布局页面

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <Button
        android:id="@+id/sbw"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="水波纹" />

</android.support.constraint.ConstraintLayout>

 

//MainActivity页面 

//点击跳转 跳到水波纹页面 也就是WaterActivity

package com.example.dell.ds_week01_lx01;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
        Button btn = findViewById( R.id.sbw );
        btn.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                startActivity( new Intent( MainActivity.this,WaterActivity.class ) );
            }
        } );
    }
}