自定义View的实现水波纹
一:
实现效果
MainActivity.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" android:orientation="vertical" tools:context=".MainActivity"> <jt.com.animatorcirecle.myview.DiffuseView android:id="@+id/diffuseView" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" app:diffuse_color="@color/colorAccent" app:diffuse_coreColor="@color/colorPrimaryDark" app:diffuse_coreImage="@android:drawable/ic_menu_search" app:diffuse_coreRadius="100" app:diffuse_maxWidth="300" app:diffuse_speed="5" app:diffuse_width="4"/> <Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="开始扩散"/> <Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:text="停止扩散"/> </LinearLayout>
MainActivity中的点击事件
public class MainActivity extends AppCompatActivity {
private Button button;
private Button button2;
private DiffuseView diffuseView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = findViewById(R.id.button);
button2 = findViewById(R.id.button2);
diffuseView = findViewById(R.id.diffuseView);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
diffuseView.start();
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
diffuseView.stop();
}
});
}
}自定义view类
public class DiffuseView extends View {
/** 扩散圆圈颜色 */
private int mColor = getResources().getColor(R.color.colorAccent);
/** 圆圈中心颜色 */
private int mCoreColor = getResources().getColor(R.color.colorPrimary);
/** 中心圆半径 */
private float mCoreRadius = 150;
/** 扩散圆宽度 */
private int mDiffuseWidth = 3;
/** 最大宽度 */
private Integer mMaxWidth = 255;
/** 扩散速度 */
private int mDiffuseSpeed = 5;
/** 是否正在扩散中 */
private boolean mIsDiffuse = false;
// 透明度集合
private List<Integer> mAlphas = new ArrayList<>();
// 扩散圆半径集合
private List<Integer> mWidths = new ArrayList<>();
private Paint mPaint;
public DiffuseView(Context context) {
this(context, null);
}
public DiffuseView(Context context, AttributeSet attrs) {
this(context, attrs, -1);
}
public DiffuseView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DiffuseView, defStyleAttr, 0);
mColor = a.getColor(R.styleable.DiffuseView_diffuse_color, mColor);
mCoreColor = a.getColor(R.styleable.DiffuseView_diffuse_coreColor, mCoreColor);
mCoreRadius = a.getFloat(R.styleable.DiffuseView_diffuse_coreRadius, mCoreRadius);
mDiffuseWidth = a.getInt(R.styleable.DiffuseView_diffuse_width, mDiffuseWidth);
mMaxWidth = a.getInt(R.styleable.DiffuseView_diffuse_maxWidth, mMaxWidth);
mDiffuseSpeed = a.getInt(R.styleable.DiffuseView_diffuse_speed, mDiffuseSpeed);
a.recycle();
}
private void init() {
mPaint = new Paint();
mPaint.setAntiAlias(true);
mAlphas.add(255);
mWidths.add(0);
}
@Override
public void invalidate() {
if(hasWindowFocus()){
super.invalidate();
}
}
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
super.onWindowFocusChanged(hasWindowFocus);
if(hasWindowFocus){
invalidate();
}
}
@Override
public void onDraw(Canvas canvas) {
// 绘制扩散圆
mPaint.setColor(mColor);
for (int i = 0; i < mAlphas.size(); i ++) {
// 设置透明度
Integer alpha = mAlphas.get(i);
mPaint.setAlpha(alpha);
// 绘制扩散圆
Integer width = mWidths.get(i);
canvas.drawCircle(getWidth() / 2, getHeight() / 2, mCoreRadius + width, mPaint);
if(alpha > 0 && width < mMaxWidth){
mAlphas.set(i, alpha - mDiffuseSpeed > 0 ? alpha - mDiffuseSpeed : 1);
mWidths.set(i, width + mDiffuseSpeed);
}
}
// 判断当扩散圆扩散到指定宽度时添加新扩散圆
if (mWidths.get(mWidths.size() - 1) >= mMaxWidth / mDiffuseWidth) {
mAlphas.add(255);
mWidths.add(0);
}
// 超过10个扩散圆，删除最外层
if(mWidths.size() >= 10){
mWidths.remove(0);
mAlphas.remove(0);
}
// 绘制中心圆
mPaint.setAlpha(255);
mPaint.setColor(mCoreColor);
canvas.drawCircle(getWidth() / 2, getHeight() / 2, mCoreRadius, mPaint);
if(mIsDiffuse){
invalidate();
}
}
/**
* 开始扩散
*/
public void start() {
mIsDiffuse = true;
invalidate();
}
/**
* 停止扩散
*/
public void stop() {
mIsDiffuse = false;
mWidths.clear();
mAlphas.clear();
mAlphas.add(255);
mWidths.add(0);
invalidate();
}
/**
* 是否扩散中
*/
public boolean isDiffuse(){
return mIsDiffuse;
}
/**
* 设置扩散圆颜色
*/
public void setColor(int colorId){
mColor = colorId;
}
/**
* 设置中心圆颜色
*/
public void setCoreColor(int colorId){
mCoreColor = colorId;
}
/**
* 设置中心圆半径
*/
public void setCoreRadius(int radius){
mCoreRadius = radius;
}
/**
* 设置扩散圆宽度(值越小宽度越大)
*/
public void setDiffuseWidth(int width){
mDiffuseWidth = width;
}
/**
* 设置最大宽度
*/
public void setMaxWidth(int maxWidth){
mMaxWidth = maxWidth;
}
/**
* 设置扩散速度，值越大速度越快
*/
public void setDiffuseSpeed(int speed){
mDiffuseSpeed = speed;
}
}自己添加的attrs.xml(创建在Values包底下,切勿倒错)
<?xml version="1.0" encoding="utf-8"?> <resources> <!--扩散圆颜色--> <attr name="diffuse_color" format="color"/> <!--中心圆颜色--> <attr name="diffuse_coreColor" format="color"/> <!--中心圆图片--> <attr name="diffuse_coreImage" format="reference"/> <!--中心圆半径--> <attr name="diffuse_coreRadius" format="float"/> <!--扩散圆宽度,值越小越宽--> <attr name="diffuse_width" format="integer"/> <!--最大扩散宽度--> <attr name="diffuse_maxWidth" format="integer"/> <!--扩散速度，值越大越快--> <attr name="diffuse_speed" format="integer"/> <declare-styleable name="DiffuseView"> <attr name="diffuse_color"/> <attr name="diffuse_coreColor"/> <attr name="diffuse_coreImage"/> <attr name="diffuse_coreRadius"/> <attr name="diffuse_width"/> <attr name="diffuse_maxWidth"/> <attr name="diffuse_speed"/> </declare-styleable> </resources>
这样就搞定了.绝对简单…zizizi
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作者：L.柚子皮