一、獲取通知欄主題顏色
由於調用系統的屬性,獲取顏色在某些手機上是不兼容的。因此採用先創建一個系統通知欄對象,然後迭代其中的 View 獲取對應的顏色。代碼如下:
import android.app.Notification;
import android.content.Context;
import android.support.v4.app.NotificationCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
* Created by iOnesmile on 06/07/2017.
*/
public class NotificationColor {
private static final String NOTIFICATION_TITLE = "notification_title";
public static final int INVALID_COLOR = -1; // 無效顏色
private static int notificationTitleColor = INVALID_COLOR; // 獲取到的顏色緩存
/**
* 獲取系統通知欄主標題顏色,根據Activity繼承自AppCompatActivity或FragmentActivity採取不同策略。
*
* @param context 上下文環境
* @return 系統主標題顏色
*/
public static int getNotificationColor(Context context) {
try {
if (notificationTitleColor == INVALID_COLOR) {
if (context instanceof AppCompatActivity) {
notificationTitleColor = getNotificationColorCompat(context);
} else {
notificationTitleColor = getNotificationColorInternal(context);
}
}
} catch (Exception ignored) {
}
return notificationTitleColor;
}
/**
* 通過一個空的Notification拿到Notification.contentView,通過{@link RemoteViews#apply(Context, ViewGroup)}方法返回通知欄消息根佈局實例。
*
* @param context 上下文
* @return 系統主標題顏色
*/
private static int getNotificationColorInternal(Context context) {
NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
builder.setContentTitle(NOTIFICATION_TITLE);
Notification notification = builder.build();
try {
ViewGroup root = (ViewGroup) notification.contentView.apply(context, new FrameLayout(context));
TextView titleView = (TextView) root.findViewById(android.R.id.title);
if (null == titleView) {
iteratorView(root, new Filter() {
@Override
public void filter(View view) {
if (view instanceof TextView) {
TextView textView = (TextView) view;
if (NOTIFICATION_TITLE.equals(textView.getText().toString())) {
notificationTitleColor = textView.getCurrentTextColor();
}
}
}
});
return notificationTitleColor;
} else {
return titleView.getCurrentTextColor();
}
} catch (Exception e) {
Log.e("NotificationColor", "", e);
return getNotificationColorCompat(context);
}
}
/**
* 使用getNotificationColorInternal()方法,Activity不能繼承自AppCompatActivity(實測5.0以下機型可以,5.0及以上機型不行),
* 大致的原因是默認通知佈局文件中的ImageView(largeIcon和smallIcon)被替換成了AppCompatImageView,
* 而在5.0及以上系統中,AppCompatImageView的setBackgroundResource(int)未被標記爲RemotableViewMethod,導致apply時拋異常。
*
* @param context 上下文
* @return 系統主標題顏色
*/
private static int getNotificationColorCompat(Context context) {
try {
NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
Notification notification = builder.build();
int layoutId = notification.contentView.getLayoutId();
ViewGroup root = (ViewGroup) LayoutInflater.from(context).inflate(layoutId, null);
TextView titleView = (TextView) root.findViewById(android.R.id.title);
if (null == titleView) {
return getTitleColorIteratorCompat(root);
} else {
return titleView.getCurrentTextColor();
}
} catch (Exception e) {
}
return INVALID_COLOR;
}
private static void iteratorView(View view, Filter filter) {
if (view == null || filter == null) {
return;
}
filter.filter(view);
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
for (int i = 0; i < viewGroup.getChildCount(); i++) {
View child = viewGroup.getChildAt(i);
iteratorView(child, filter);
}
}
}
private static int getTitleColorIteratorCompat(View view) {
if (view == null) {
return INVALID_COLOR;
}
List<TextView> textViews = getAllTextViews(view);
int maxTextSizeIndex = findMaxTextSizeIndex(textViews);
if (maxTextSizeIndex != Integer.MIN_VALUE) {
return textViews.get(maxTextSizeIndex).getCurrentTextColor();
}
return INVALID_COLOR;
}
private static int findMaxTextSizeIndex(List<TextView> textViews) {
float max = Integer.MIN_VALUE;
int maxIndex = Integer.MIN_VALUE;
int index = 0;
for (TextView textView : textViews) {
if (max < textView.getTextSize()) {
// 找到字號最大的字體,默認把它設置爲主標題字號大小
max = textView.getTextSize();
maxIndex = index;
}
index++;
}
return maxIndex;
}
/**
* 實現遍歷View樹中的TextView,返回包含TextView的集合。
*
* @param root 根節點
* @return 包含TextView的集合
*/
private static List<TextView> getAllTextViews(View root) {
final List<TextView> textViews = new ArrayList<>();
iteratorView(root, new Filter() {
@Override
public void filter(View view) {
if (view instanceof TextView) {
textViews.add((TextView) view);
}
}
});
return textViews;
}
private interface Filter {
void filter(View view);
}
}
二、渲染播放圖標
播放器圖標的渲染,採用 v4
包中的 tint
方法,代碼如下:
public static Bitmap getBitmapByIdAndRender(Context context, int drawableResId, int renderColor) {
Drawable drawable = getDrawable(context, drawableResId);
drawable = tintDrawable(drawable, ColorStateList.valueOf(renderColor));
return drawableToBitmap(drawable);
}
public static Drawable getDrawable(Context context, int imageRes) {
Drawable drawable = context.getResources().getDrawable(imageRes);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
return drawable;
}
public static Drawable tintDrawable(Drawable drawable, ColorStateList colors) {
final Drawable wrappedDrawable = DrawableCompat.wrap(drawable);
DrawableCompat.setTintList(wrappedDrawable, colors);
return wrappedDrawable;
}
在設置副標題的顏色時,我採用了給主標題設置一個透明度的方式來達到,通過 HSV 模型把顏色和透明度合成一個新的色值:
/**
* 把RGB + Alpha合成爲一個新的RGB
* @param alpha
* @param color
* @return
*/
public static int getCompoundColor(int alpha, int color) {
float[] hsv = new float[]{0, 0, 1};
Color.colorToHSV(color, hsv);
hsv[2] = (alpha + 0.0f) / 0xFF;
color = Color.HSVToColor(hsv);
return color;
}
三、參考鏈接
Android自定義通知樣式適配 http://www.jianshu.com/p/426d85f34561
Android通知欄介紹與適配總結 http://iluhcm.com/2017/03/12/experience-of-adapting-to-android-notifications/