我试图理解如何实现"涟漪效应-触摸反馈"按钮和其他视图。我研究了与SO的涟漪效应相关的问题,并对此有所了解。我能够使用这个java代码成功地获得涟漪效应。
import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RadialGradient;
import android.graphics.Region;
import android.graphics.Shader;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.animation.AccelerateInterpolator;
import android.widget.Button;
public class MyButton extends Button {
private float mDownX;
private float mDownY;
private float mRadius;
private Paint mPaint;
public MyButton(final Context context) {
super(context);
init();
}
public MyButton(final Context context, final AttributeSet attrs) {
super(context, attrs);
init();
}
public MyButton(final Context context, final AttributeSet attrs,
final int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
mPaint = new Paint();
mPaint.setAlpha(100);
}
@Override
public boolean onTouchEvent(@NonNull final MotionEvent event) {
if (event.getActionMasked() == MotionEvent.ACTION_UP) {
mDownX = event.getX();
mDownY = event.getY();
ObjectAnimator animator = ObjectAnimator.ofFloat(this, "radius", 0,
getWidth() * 3.0f);
animator.setInterpolator(new AccelerateInterpolator());
animator.setDuration(400);
animator.start();
}
return super.onTouchEvent(event);
}
public void setRadius(final float radius) {
mRadius = radius;
if (mRadius > 0) {
RadialGradient radialGradient = new RadialGradient(mDownX, mDownY,
mRadius * 3, Color.TRANSPARENT, Color.BLACK,
Shader.TileMode.MIRROR);
mPaint.setShader(radialGradient);
}
invalidate();
}
private Path mPath = new Path();
private Path mPath2 = new Path();
@Override
protected void onDraw(@NonNull final Canvas canvas) {
super.onDraw(canvas);
mPath2.reset();
mPath2.addCircle(mDownX, mDownY, mRadius, Path.Direction.CW);
canvas.clipPath(mPath2);
mPath.reset();
mPath.addCircle(mDownX, mDownY, mRadius / 3, Path.Direction.CW);
canvas.clipPath(mPath, Region.Op.DIFFERENCE);
canvas.drawCircle(mDownX, mDownY, mRadius, mPaint);
}
}
但是,我想使用XML方法。我如何做到这一点?我看过这个和这个,但我对风格还不是很熟悉,所以我发现很难达到连锁反应。
我有一个按钮与以下XML代码:
<Button
android:id="@+id/button_email"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="0.50"
android:gravity="center"
android:text="@string/email" />
我如何得到这个按钮的连锁反应。如果有人能指导我,我会很感激。
[EDIT]添加ripple.xml和background.xml,正如上面的一个链接所提到的。我已经在res中创建了一个drawable-v21文件夹,并在那里添加了以下文件:
ripple.xml
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="@android:color/black" >
<item android:drawable="@drawable/background">
</item>
</ripple>
background.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="@android:color/darker_gray" />
</shape>
我添加了波纹作为我的按钮的背景,这是我的按钮的xml现在..
<Button
android:id="@+id/button_email"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="0.50"
android:gravity="center"
android:background="@drawable/ripple"
android:text="@string/email" />
当我运行应用程序时,我得到一个ResourceNotFoundException。这是logcat跟踪。
07-21 17:03:39.043: E/AndroidRuntime(15710): FATAL EXCEPTION: main
07-21 17:03:39.043: E/AndroidRuntime(15710): Process: com.xx.xxx, PID: 15710
07-21 17:03:39.043: E/AndroidRuntime(15710): android.view.InflateException: Binary XML file line #60: Error inflating class <unknown>
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.createView(LayoutInflater.java:620)
07-21 17:03:39.043: E/AndroidRuntime(15710): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
07-21 17:03:39.043: E/AndroidRuntime(15710): at com.xx.xxx.BusinessAdapter.onCreateViewHolder(BusinessAdapter.java:106)
07-21 17:03:39.043: E/AndroidRuntime(15710): at com.xx.xxx.BusinessAdapter.onCreateViewHolder(BusinessAdapter.java:1)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:2915)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:2511)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.support.v7.widget.LinearLayoutManager$RenderState.next(LinearLayoutManager.java:1425)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:999)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:524)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:1461)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:1600)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.View.layout(View.java:14817)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewGroup.layout(ViewGroup.java:4631)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.View.layout(View.java:14817)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewGroup.layout(ViewGroup.java:4631)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.View.layout(View.java:14817)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewGroup.layout(ViewGroup.java:4631)
07-21 17:03:39.043: E/AndroidRuntime(15710): at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.View.layout(View.java:14817)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewGroup.layout(ViewGroup.java:4631)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.View.layout(View.java:14817)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewGroup.layout(ViewGroup.java:4631)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1983)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1740)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.Choreographer.doFrame(Choreographer.java:544)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.os.Handler.handleCallback(Handler.java:733)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.os.Handler.dispatchMessage(Handler.java:95)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.os.Looper.loop(Looper.java:136)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.app.ActivityThread.main(ActivityThread.java:5001)
07-21 17:03:39.043: E/AndroidRuntime(15710): at java.lang.reflect.Method.invokeNative(Native Method)
07-21 17:03:39.043: E/AndroidRuntime(15710): at java.lang.reflect.Method.invoke(Method.java:515)
07-21 17:03:39.043: E/AndroidRuntime(15710): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
07-21 17:03:39.043: E/AndroidRuntime(15710): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
07-21 17:03:39.043: E/AndroidRuntime(15710): at dalvik.system.NativeStart.main(Native Method)
07-21 17:03:39.043: E/AndroidRuntime(15710): Caused by: java.lang.reflect.InvocationTargetException
07-21 17:03:39.043: E/AndroidRuntime(15710): at java.lang.reflect.Constructor.constructNative(Native Method)
07-21 17:03:39.043: E/AndroidRuntime(15710): at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
07-21 17:03:39.043: E/AndroidRuntime(15710): at android.view.LayoutInflater.createView(LayoutInflater.java:594)
07-21 17:03:39.043: E/AndroidRuntime(15710): ... 50 more
07-21 17:03:39.043: E/AndroidRuntime(15710): Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x1/d=0x7f020075 a=-1 r=0x
UPDATE Material Components:
使用Material Components Library可以很容易地应用波纹。
只使用MaterialButton
和 app:rippleColor
属性:
<com.google.android.material.button.MaterialButton
app:rippleColor="@color/my_selector"
../>
使用这样的选择器:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:alpha="..." android:color="?attr/colorOnPrimary" android:state_pressed="true"/>
<item android:alpha="..." android:color="?attr/colorOnPrimary" android:state_focused="true" android:state_hovered="true"/>
<item android:alpha="..." android:color="?attr/colorOnPrimary" android:state_focused="true"/>
<item android:alpha="..." android:color="?attr/colorOnPrimary" android:state_hovered="true"/>
<item android:alpha="..." android:color="?attr/colorOnPrimary"/>
</selector>
旧答案
你可以这样做:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/ripple"
/>
ripple.xml所在位置:
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:colorControlHighlight">
<item android:id="@android:id/mask">
<shape android:shape="oval">
<solid android:color="?android:colorAccent" />
</shape>
</item>
</ripple>
只需将?attr/selectableItemBackground
放在API 21+按钮的背景中,如下所示:
<Button
android:layout_width="match_parent"
android:layout_height="70dp"
android:background="?attr/selectableItemBackground"
android:text="Button" />
对于lollipop(API>21),将文件设置为btn_ripple_effect.xml,并放置在下面的代码
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:color="?android:colorAccent"
tools:targetApi="lollipop">
<item android:drawable="@color/cancel_btn_clr" /> <!-- default -->
<item android:id="@android:id/mask">
<shape android:shape="rectangle">
<solid android:color="?android:colorAccent" />
</shape>
</item>
</ripple>
对于pre - lollipop (API<21),在draw_v21文件夹中创建btn_ripple_effect.xml文件,并将下面的代码
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape>
<solid android:color="@color/colorAccent"></solid>
</shape>
</item>
<item>
<shape>
<solid android:color="@color/cancel_btn_clr"></solid>
</shape>
</item>
</selector>
对上面的答案稍加补充:请注意,没有以任何方式使用遮罩颜色。
你也可以用ripple做更复杂的事情。例如,如果你想在你的波纹按钮上有一个边框,你可以像使用图层列表一样使用它。
<ripple
xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:colorControlHighlight">
<!-- Note: <ripple> acts like a layer-list -->
<item android:id="@android:id/mask">
<shape android:shape="oval">
<!-- This color is not displayed in any way -->
<solid android:color="@android:color/black" />
</shape>
</item>
<!-- This is the border -->
<item>
<shape android:shape="rectangle">
<corners android:radius="3dp"/>
<!-- Use your border color in place of #f00 -->
<stroke android:width="1dp" android:color="#f00"/>
</shape>
</item>
</ripple>
请注意,id为@android:id/mask
的元素仅用于显示连锁反应将在何处停止。如果你想让它覆盖整个按钮,你可以把android:shape
改成rectangle
。你可以想象用它做更多有趣的事情!
还要确保有一个备份可绘制的设备,还没有21或应用程序会崩溃的旧设备。
在android:前台中使用这个最好的方法,因为它也允许你使用自己的背景。
android:前景= " ?android: attr/selectableItemBackground"
的例子:
<android.support.v7.widget.AppCompatButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:foreground="?android:attr/selectableItemBackground"
android:background="@color/button.normal"
android:textColor="@color/white"/>
我正在研究涟漪效应,因为我想把它应用到我的应用程序中的几个按钮上,碰巧在你的帖子上发生了。虽然您的问题是寻找关于如何使用XML添加涟漪效应的答案,但实际上这是我试图避免的事情,因为在尝试添加该属性时,您看到它需要v21。
如果您的目标低于v21,那么扩展Button(或ImageButton等)的新类将避免编译器的投诉。
由于没有解释如何实现上面的自定义类,我想我将填写。你所需要做的就是创建新类,然后在XML文件中将"Button"更改为"the.package.name. mybutton "。
来自: <Button
android:id="@+id/Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
:
<the.package.name.MyButton
android:id="@+id/Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
就是这样。现在你的按钮,当按下将有一个波纹包含在其范围内。
我喜欢这种方法,我只是希望波纹能扩展到边界。对于一个小按钮,这种涟漪效应确实突出了按钮的正方形或矩形。从视觉上看,如果波纹持续到它的整个半径,会更令人满意。
您可以将clickable
添加为true
, background
或foreround
添加为?attr/selectableItemBackground
属性到视图:
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button"
android:clickable="true"
android:background="?attr/selectableItemBackground"
android:textColor="@android:color/white"/>
如果你的视图已经用background
填充了一些东西,你可以用selectableItemBackground
填充foreground
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button"
android:clickable="true"
android:foreground="?attr/selectableItemBackground"
android:background="@color/colorPrimary"
android:textColor="@android:color/white"/>