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 ) ); } } ); } }