Android Tint使用
Tint 属性
Tint 是 Android5.0 引入的一个属性，它可以在Android5.0 系统上，对视图进行颜色渲染。
下面是网上一个使用tint属性给背景调整不同颜色的例子：
"horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
...
android:src="@drawable/xamarin_white"
android:background="@drawable/mycircle"/>
...
android:src="@drawable/xamarin_white"
android:background="@drawable/mycircle"
android:tint="#2C3E50"/>
...
android:src="@drawable/xamarin_white"
android:background="@drawable/mycircle"
android:tint="#B4BCBC"/>
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效果图：
tint这个属性，是ImageView有的，它可以给ImageView的src设置，除了tint 之外，还有backgroundTint,foregroundTint,drawableTint,它们分别对应对背景、前景、drawable进行着色处理。 如果，我们给上面的例子设置 backgroundTint，那么蓝色背景就会被着色，替换成你设置的颜色。
原理
在5.0以上，View类中增加了对tint属性的获取
case R.styleable.View_backgroundTint:
// This will get applied later during setBackground().
if (mBackgroundTint == null) {
mBackgroundTint = new TintInfo();
}
mBackgroundTint.mTintList = a.getColorStateList(
R.styleable.View_backgroundTint);
mBackgroundTint.mHasTintList = true;
break;
case R.styleable.View_backgroundTintMode:
// This will get applied later during setBackground().
if (mBackgroundTint == null) {
mBackgroundTint = new TintInfo();
}
mBackgroundTint.mTintMode = Drawable.parseTintMode(a.getInt(
R.styleable.View_backgroundTintMode, -1), null);
mBackgroundTint.mHasTintMode = true;
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以具体的 ImageView 为例
//在构造函数中调用了这个方法
private void applyImageTint() {
if (mDrawable != null && (mHasDrawableTint || mHasDrawableTintMode)) {
mDrawable = mDrawable.mutate();
if (mHasDrawableTint) {
mDrawable.setTintList(mDrawableTintList);
}
if (mHasDrawableTintMode) {
mDrawable.setTintMode(mDrawableTintMode);
}
// The drawable (or one of its children) may not have been
// stateful before applying the tint, so let's try again.
if (mDrawable.isStateful()) {
mDrawable.setState(getDrawableState());
}
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setTintList 方法的实现
public void setTintList(ColorStateList tint) {
mBitmapState.mTint = tint;
mTintFilter = updateTintFilter(mTintFilter, tint, mBitmapState.mTintMode);
invalidateSelf();
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当追踪到 updateTintFilter（）这个方法的时候，我们就无法继续向下追踪了，不过研究参数也可以得出它实现的方式(PorterDuffColorFilter,BitmapDrawable.BitmapState,PorterDuff.Mode), 很明显，还是利用的PorterDuff那些相关类来实现的操作，ProterDuff 网上也有很多说明的例子，最重要的还是下图： 有关这些Mode的详细解释，大家自行查阅 
版本问题
Tint在默认只在Android5.0以上的系统生效，为了向下支持，系统提供了相应的Compact类，包括
AppCompatTextView、AppCompatImageView等。我们使用 ViewCompat.setBackgroundTintMode 在懂吗中动态的为 View 进行tint 操作，观察 这些Compat类发现都实现了 TintableBackgroundView 这个接口，如果需要让自定义的 View实现tint功能，我们可以仿照系统的实现类来实现。
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.support.v4.view;
import android.content.res.ColorStateList;
import android.graphics.PorterDuff;
import android.support.annotation.Nullable;
/**
* Interface which allows a {@link android.view.View} to receive background tinting calls from
* {@code ViewCompat} when running on API v20 devices or lower.
*/
public interface TintableBackgroundView {
/**
* Applies a tint to the background drawable. Does not modify the current tint
* mode, which is {@link PorterDuff.Mode#SRC_IN} by default.
*
* Subsequent calls to {@code View.setBackground(Drawable)} will automatically
* mutate the drawable and apply the specified tint and tint mode.
*
* @param tint the tint to apply, may be {@code null} to clear tint
*
* @see #getSupportBackgroundTintList()
*/
void setSupportBackgroundTintList(@Nullable ColorStateList tint);
/**
* Return the tint applied to the background drawable, if specified.
*
* @return the tint applied to the background drawable
*/
@Nullable
ColorStateList getSupportBackgroundTintList();
/**
* Specifies the blending mode used to apply the tint specified by
* {@link #setSupportBackgroundTintList(ColorStateList)}} to the background
* drawable. The default mode is {@link PorterDuff.Mode#SRC_IN}.
*
* @param tintMode the blending mode used to apply the tint, may be
* {@code null} to clear tint
* @see #getSupportBackgroundTintMode()
*/
void setSupportBackgroundTintMode(@Nullable PorterDuff.Mode tintMode);
/**
* Return the blending mode used to apply the tint to the background
* drawable, if specified.
*
* @return the blending mode used to apply the tint to the background
* drawable
*/
@Nullable
PorterDuff.Mode getSupportBackgroundTintMode();
}
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参考：http://www.open-open.com/lib/view/open1454052058573.html