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本文為大家分享了類似微信朋友圈，點擊+號圖片，可以加圖片功能，供大家參考，具體內容如下
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" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="40dp" android:orientation="vertical" > <com.sw.demo.widget.NinePhotoView android:id="@+id/photoview" android:layout_width="match_parent" android:layout_height="wrap_content" app:ninephoto_hspace="10dp" app:ninephoto_vspace="10dp" app:rainbowbar_color="@android:color/holo_blue_bright" > </com.sw.demo.widget.NinePhotoView>
NinePhotoView.java
public class NinePhotoView extends ViewGroup {
public static final int MAX_PHOTO_NUMBER = 9;
private int[] constImageIds = { R.drawable.girl_0, R.drawable.girl_1,
R.drawable.girl_2, R.drawable.girl_3, R.drawable.girl_4,
R.drawable.girl_5, R.drawable.girl_6, R.drawable.girl_7,
R.drawable.girl_8 };
// horizontal space among children views
int hSpace = Utils.dpToPx(10, getResources());
// vertical space among children views
int vSpace = Utils.dpToPx(10, getResources());
// every child view width and height.
int childWidth = 0;
int childHeight = 0;
// store images res id
ArrayList<integer> mImageResArrayList = new ArrayList<integer>(9);
private View addPhotoView;
public NinePhotoView(Context context) {
super(context);
}
public NinePhotoView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public NinePhotoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray t = context.obtainStyledAttributes(attrs,
R.styleable.NinePhotoView, 0, 0);
hSpace = t.getDimensionPixelSize(
R.styleable.NinePhotoView_ninephoto_hspace, hSpace);
vSpace = t.getDimensionPixelSize(
R.styleable.NinePhotoView_ninephoto_vspace, vSpace);
t.recycle();
addPhotoView = new View(context);
addView(addPhotoView);
mImageResArrayList.add(new integer());
}
Measure
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int rw = MeasureSpec.getSize(widthMeasureSpec);
int rh = MeasureSpec.getSize(heightMeasureSpec);
childWidth = (rw - 2 * hSpace) / 3;
childHeight = childWidth;
int childCount = this.getChildCount();
for (int i = 0; i < childCount; i++) {
View child = this.getChildAt(i);
//this.measureChild(child, widthMeasureSpec, heightMeasureSpec);
LayoutParams lParams = (LayoutParams) child.getLayoutParams();
lParams.left = (i % 3) * (childWidth + hSpace);
lParams.top = (i / 3) * (childWidth + vSpace);
}
int vw = rw;
int vh = rh;
if (childCount < 3) {
vw = childCount * (childWidth + hSpace);
}
vh = ((childCount + 3) / 3) * (childWidth + vSpace);
setMeasuredDimension(vw, vh);
}
我們的子View三個一排，而且都是正方形，所以我們上面通過循環很好去得到所有子View的位置，注意我們上面把子View的左上角坐標存儲到我們自定義的LayoutParams 的left和top二個字段中，Layout階段會使用，最后我們算得整個ViewGroup的寬高，調用setMeasuredDimension設置。
Layout
@Override
protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
int childCount = this.getChildCount();
for (int i = 0; i < childCount; i++) {
View child = this.getChildAt(i);
LayoutParams lParams = (LayoutParams) child.getLayoutParams();
child.layout(lParams.left, lParams.top, lParams.left + childWidth,
lParams.top + childHeight);
if (i == mImageResArrayList.size() - 1 && mImageResArrayList.size() != MAX_PHOTO_NUMBER) {
child.setBackgroundResource(R.drawable.add_photo);
child.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
addPhotoBtnClick();
}
});
}else {
child.setBackgroundResource(constImageIds[i]);
child.setOnClickListener(null);
}
}
}
public void addPhoto() {
if (mImageResArrayList.size() < MAX_PHOTO_NUMBER) {
View newChild = new View(getContext());
addView(newChild);
mImageResArrayList.add(new integer());
requestLayout();
invalidate();
}
}
public void addPhotoBtnClick() {
final CharSequence[] items = { "Take Photo", "Photo from gallery" };
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
addPhoto();
}
});
builder.show();
}
最核心的就是調用layout方法，根據我們measure階段獲得的LayoutParams中的left和top字段，也很好對每個子View進行位置排列。然后判斷在圖片未達到最大值9張時，默認最后一張是+號圖片，然后設置點擊事件，彈出對話框供用戶選擇操作。
Draw
不需要重寫，使用ViewGroup默認實現即可。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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