现象
图片.png
状态栏图标显示的个数有两个限制：
1.最大个数限制8个（包括battery）：
2.宽度限制；
最终能够显示的图标个数取这两个限制的较小值。
相关代码逻辑在com.android.systemui.statusbar.phone/StatusIconContainer.java类中：
// Max 8 status icons including battery
private static final int MAX_ICONS = 7;
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mMeasureViews.clear();
int mode = MeasureSpec.getMode(widthMeasureSpec);
final int width = MeasureSpec.getSize(widthMeasureSpec);
final int count = getChildCount();
// Collect all of the views which want to be laid out
for (int i = 0; i < count; i++) {
StatusIconDisplayable icon = (StatusIconDisplayable) getChildAt(i);
if (icon.isIconVisible() && !icon.isIconBlocked()) {
mMeasureViews.add((View) icon);
}
}
int visibleCount = mMeasureViews.size();
int maxVisible = visibleCount <= MAX_ICONS ? MAX_ICONS : MAX_ICONS - 1;
int totalWidth = mPaddingLeft + mPaddingRight;
boolean trackWidth = true;
// Measure all children so that they report the correct width
int childWidthSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.UNSPECIFIED);
mNeedsUnderflow = mShouldRestrictIcons && visibleCount > MAX_ICONS;
for (int i = 0; i < mMeasureViews.size(); i++) {
// Walking backwards
View child = mMeasureViews.get(visibleCount - i - 1);
measureChild(child, childWidthSpec, heightMeasureSpec);
if (mShouldRestrictIcons) {
if (i < maxVisible && trackWidth) {
totalWidth += getViewTotalMeasuredWidth(child);
} else if (trackWidth) {
// We've hit the icon limit; add space for dots
totalWidth += mUnderflowWidth;
trackWidth = false;
}
} else {
totalWidth += getViewTotalMeasuredWidth(child);
}
}
if (mode == MeasureSpec.EXACTLY) {
if (!mNeedsUnderflow && totalWidth > width) {
mNeedsUnderflow = true;
}
setMeasuredDimension(width, MeasureSpec.getSize(heightMeasureSpec));
} else {
if (mode == MeasureSpec.AT_MOST && totalWidth > width) {
mNeedsUnderflow = true;
totalWidth = width;
}
setMeasuredDimension(totalWidth, MeasureSpec.getSize(heightMeasureSpec));
}
}
/**
* Layout is happening from end -> start
*/
private void calculateIconTranslations() {
mLayoutStates.clear();
float width = getWidth();
float translationX = width - getPaddingEnd();
float contentStart = getPaddingStart();
int childCount = getChildCount();
// Underflow === don't show content until that index
if (DEBUG) android.util.Log.d(TAG, "calculateIconTranslations: start=" + translationX
+ " width=" + width + " underflow=" + mNeedsUnderflow);
// Collect all of the states which want to be visible
for (int i = childCount - 1; i >= 0; i--) {
View child = getChildAt(i);
StatusIconDisplayable iconView = (StatusIconDisplayable) child;
StatusIconState childState = getViewStateFromChild(child);
if (!iconView.isIconVisible() || iconView.isIconBlocked()) {
childState.visibleState = STATE_HIDDEN;
if (DEBUG) Log.d(TAG, "skipping child (" + iconView.getSlot() + ") not visible");
continue;
}
childState.visibleState = STATE_ICON;
childState.xTranslation = translationX - getViewTotalWidth(child);
mLayoutStates.add(0, childState);
translationX -= getViewTotalWidth(child);
}
// Show either 1-MAX_ICONS icons, or (MAX_ICONS - 1) icons + overflow
int totalVisible = mLayoutStates.size();
int maxVisible = totalVisible <= MAX_ICONS ? MAX_ICONS : MAX_ICONS - 1;
mUnderflowStart = 0;
int visible = 0;
int firstUnderflowIndex = -1;
for (int i = totalVisible - 1; i >= 0; i--) {
StatusIconState state = mLayoutStates.get(i);
// Allow room for underflow if we found we need it in onMeasure
if (mNeedsUnderflow && (state.xTranslation < (contentStart + mUnderflowWidth))||
(mShouldRestrictIcons && visible >= maxVisible)) {
firstUnderflowIndex = i;
break;
}
mUnderflowStart = (int) Math.max(contentStart, state.xTranslation - mUnderflowWidth);
visible++;
}
if (firstUnderflowIndex != -1) {
int totalDots = 0;
int dotWidth = mStaticDotDiameter + mDotPadding;
int dotOffset = mUnderflowStart + mUnderflowWidth - mIconDotFrameWidth;
for (int i = firstUnderflowIndex; i >= 0; i--) {
StatusIconState state = mLayoutStates.get(i);
if (totalDots < MAX_DOTS) {
state.xTranslation = dotOffset;
state.visibleState = STATE_DOT;
dotOffset -= dotWidth;
totalDots++;
} else {
state.visibleState = STATE_HIDDEN;
}
}
}
// Stole this from NotificationIconContainer. Not optimal but keeps the layout logic clean
if (isLayoutRtl()) {
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
StatusIconState state = getViewStateFromChild(child);
state.xTranslation = width - state.xTranslation - child.getWidth();
}
}
}
宽度设定，可以看status_bar.xml:
<FrameLayout
android:layout_height="match_parent"
android:layout_width="0dp"
android:layout_weight="1">
<include layout="@layout/heads_up_status_bar_layout" />
<!-- The alpha of the left side is controlled by PhoneStatusBarTransitions, and the
individual views are controlled by StatusBarManager disable flags DISABLE_CLOCK and
DISABLE_NOTIFICATION_ICONS, respectively -->
<LinearLayout
android:id="@+id/status_bar_left_side"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:clipChildren="false"
>
<com.android.systemui.statusbar.AlphaOptimizedFrameLayout
android:id="@+id/notification_icon_area"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
android:clipChildren="false"/>
</LinearLayout>
</FrameLayout>
<!-- Space should cover the notch (if it exists) and let other views lay out around it -->
<android.widget.Space
android:id="@+id/cutout_space_view"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center_horizontal|center_vertical"
/>
<com.android.keyguard.AlphaOptimizedLinearLayout android:id="@+id/system_icon_area"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
android:gravity="center_vertical|end"
>
<include layout="@layout/system_icons" />
</com.android.keyguard.AlphaOptimizedLinearLayout>
结论：从代码可见通知图标区域@+id/notification_icon_area和状态栏图标区域@+id/system_icon_area的layout_weight的比例是1:1，可以修改比例为1:2或者3:4，增大状态栏图标的比例，从而能显示更多的图标。
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