【安卓笔记】仿乐安全首页动态效果

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先看效果：

布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center"tools:context=".MainActivity" ><FrameLayoutandroid:layout_width="match_parent"android:layout_height="match_parent" ><ImageViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:src="@drawable/homepage_disk_button_orange_normal" /><ImageViewandroid:id="@+id/iv_rotate"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:src="@drawable/homepage_disk_orange_normal" /><com.example.view.RadiationViewandroid:id="@+id/rv"android:layout_width="250dp"android:layout_height="250dp"android:layout_gravity="center" /><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:text="SB"android:textColor="#ffffff"android:textSize="30sp" /></FrameLayout>
</LinearLayout>

旋转动画：

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"android:duration="12000"android:fromDegrees="0"android:pivotX="50%"android:pivotY="50%"android:startOffset="0"android:interpolator="@android:anim/linear_interpolator"android:repeatCount="infinite"android:repeatMode="restart"android:toDegrees="360" />

带辐射效果的view：

package com.example.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
/*** @author Rowandjj**带辐射效果的view*/
public class RadiationView extends View
{/***画笔*/private Paint mPaint = new Paint();/***颜色 */private int mColor = 0x3f990e;/*** 透明度*/private int mAlpha = 60;private Handler mHandler = null;private static final int MESSAGE_DRAW = 0;private static final String TAG = "RadiationView";private int width;private int height;/*** 扩散速度*/private int speed = 30;/***最大辐射半径 */private int maxRadius = 100;private int centerX;private int centerY;/*** 最小半径*/private int minRadius = 70;/*** 当前半径*/private int radius = minRadius;private boolean isStarted = false;public RadiationView(Context context){super(context);init();}public RadiationView(Context context, AttributeSet attrs){super(context, attrs, 0);init();}public void startRadiate(){isStarted = true;mHandler.sendEmptyMessage(MESSAGE_DRAW);}private void init(){mPaint = new Paint();mPaint.setStrokeWidth(1);//必须先设置color，再设置alphamPaint.setColor(mColor);mPaint.setAlpha(mAlpha);mHandler = new Handler(){public void handleMessage(android.os.Message msg) {if(msg.what == MESSAGE_DRAW){invalidate();if(isStarted){sendEmptyMessageDelayed(MESSAGE_DRAW,speed);}}}};}@Overrideprotected void onLayout(boolean changed, int left, int top, int right,int bottom){super.onLayout(changed, left, top, right, bottom);width = this.getWidth();height = this.getHeight();if(width <= 0 || height<=0){throw new RuntimeException("size illegal");}//中心点centerX = width/2;centerY = height/2;//最大辐射半径maxRadius = (width > height) ? height/2 : width/2;Log.i(TAG,"MAX"+maxRadius);if(maxRadius < 70){throw new RuntimeException("size too small");}}@Overrideprotected void onDraw(Canvas canvas){mPaint.setColor(mColor);mPaint.setAlpha(mAlpha);if(radius <= 0){return;}if(radius > maxRadius){radius = minRadius;}canvas.save();canvas.drawCircle(centerX, centerY, radius, mPaint);canvas.restore();radius += 1;}@Overrideprotected void onAttachedToWindow(){super.onAttachedToWindow();this.setLayerType(View.LAYER_TYPE_SOFTWARE, null);}public void setColor(int color){this.mColor = color;}public void setSpeed(int speed){this.speed = speed;}public void setMinRadius(int radius){this.minRadius = radius;}
}

调用的代码：

package com.example.animdemo1;
import android.app.Activity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import com.example.view.RadiationView;
public class MainActivity extends Activity
{private ImageView iv = null;private RadiationView rv = null;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);iv = (ImageView) findViewById(R.id.iv_rotate);rv = (RadiationView) findViewById(R.id.rv);rv.setMinRadius(70);//辐射半径rv.startRadiate();//开始辐射Animation anim = AnimationUtils.loadAnimation(this, R.anim.rotate_circle_anim);iv.startAnimation(anim);//开始动画}
}

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