本文为大家分享了类似微信朋友圈,点击+号图片,可以加图片功能,供大家参考,具体内容如下
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,defStyle); TypedArray t = context.obtainStyledAttributes(attrs,R.styleable.NinePhotoView,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); }
我们的子View三个一排,而且都是正方形,所以我们上面通过循环很好去得到所有子View的位置,注意我们上面把子View的左上角坐标存储到我们自定义的LayoutParams 的left和top二个字段中,Layout阶段会使用,最后我们算得整个ViewGroup的宽高,调用setMeasuredDimension设置。
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(); }
最核心的就是调用layout方法,根据我们measure阶段获得的LayoutParams中的left和top字段,也很好对每个子View进行位置排列。然后判断在图片未达到最大值9张时,默认最后一张是+号图片,然后设置点击事件,弹出对话框供用户选择操作。
Draw
不需要重写,使用ViewGroup默认实现即可。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持编程小技巧。
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