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自定義View常用例子二（點擊展開隱藏控件，九宮格圖片控件）

來源：程序員人生發布時間：2016-07-04 16:42:41 閱讀次數：3062次

自定義View經常使用例子2（點擊展開隱藏控件，9宮格圖片控件）

今天博客的主要內容是兩個常見的自定義控件，第1個是我們常常看到的點擊隱藏點擊查看控件，第2個控件是仿微信朋友圈的9宮格圖片控件，相對上1篇的流布式布局來講，這篇博客更容易，只不過觸及更多的知識點而已

轉載請注明原博客地址：http://blog.csdn.net/gdutxiaoxu/article/details/51772308

1.空話不多說了，先來看1下效果圖

圖1效果,點擊隱藏，展開

圖2效果，類似于朋友圈9宮格圖片

圖2源碼下載地址

圖1源碼下載地址：

圖1源碼

```

public class CollapseView extends LinearLayout {
    private long duration = 350;
    private Context mContext;
    private TextView mNumberTextView;
    private TextView mTitleTextView;
    private RelativeLayout mContentRelativeLayout;
    private RelativeLayout mTitleRelativeLayout;
    private ImageView mArrowImageView;
    int parentWidthMeasureSpec;
    int parentHeightMeasureSpec;
    private String TAG = "xujun";

    public CollapseView(Context context) {
        this(context, null);
    }

    public CollapseView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        LayoutInflater.from(mContext).inflate(R.layout.collapse_layout, this);
        initView();
    }


    private void initView() {
        mNumberTextView = (TextView) findViewById(R.id.numberTextView);
        mTitleTextView = (TextView) findViewById(R.id.titleTextView);
        mTitleRelativeLayout = (RelativeLayout) findViewById(R.id.titleRelativeLayout);
        mContentRelativeLayout = (RelativeLayout) findViewById(R.id.contentRelativeLayout);
        mArrowImageView = (ImageView) findViewById(R.id.arrowImageView);
        mTitleRelativeLayout.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                rotateArrow();
            }
        });
        mNumberTextView.setBackgroundResource(R.drawable.circle);
        Drawable circleShape = createCircleShape(Color.BLACK);
        mNumberTextView.setBackgroundDrawable(circleShape);
        collapse(mContentRelativeLayout);
    }

    public void setNumber(String number) {
        if (!TextUtils.isEmpty(number)) {
            mNumberTextView.setText(number);
        }
    }

    public void setTitle(String title) {
        if (!TextUtils.isEmpty(title)) {
            mTitleTextView.setText(title);
        }
    }

    public void setContent(int resID) {
        View view = LayoutInflater.from(mContext).inflate(resID, null);
        RelativeLayout.LayoutParams layoutParams =
                new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, RelativeLayout
                        .LayoutParams.WRAP_CONTENT);
        view.setLayoutParams(layoutParams);
        mContentRelativeLayout.addView(view);
    }

    /**
     * 若使用這個方法，強迫layoutParams must be RelativeLayout.LayoutParams，避免在某些情況下出現毛病
     *
     * @param view
     */
    public void setContent(View view) {
        ViewGroup.LayoutParams layoutParams = view.getLayoutParams();

        if (layoutParams == null) {
            layoutParams = new RelativeLayout.LayoutParams(
                    LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        }

        if (!(layoutParams instanceof RelativeLayout.LayoutParams)) {
            throw new IllegalStateException("layoutParams must be RelativeLayout.LayoutParams ");
        }

        view.setLayoutParams(layoutParams);
        mContentRelativeLayout.addView(view);
    }

    public void rotateArrow() {
        int degree = 0;
        if (mArrowImageView.getTag() == null || mArrowImageView.getTag().equals(true)) {
            mArrowImageView.setTag(false);
            degree = ⑴80;
            expand(mContentRelativeLayout);
        } else {
            degree = 0;
            mArrowImageView.setTag(true);
            collapse(mContentRelativeLayout);
        }
        mArrowImageView.animate().setDuration(duration).rotation(degree);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        parentWidthMeasureSpec = widthMeasureSpec;
        parentHeightMeasureSpec = heightMeasureSpec;
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
    }




    // 展開
    private void expand(final View view) {

        view.setVisibility(View.VISIBLE);
        int childWidthMode = getMode(parentWidthMeasureSpec);
        int childHeightMode = getMode(parentHeightMeasureSpec);
        view.measure(childWidthMode, childHeightMode);
        final int measuredWidth = view.getMeasuredWidth();
        final int measuredHeight = view.getMeasuredHeight();

        final ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);
        valueAnimator.setDuration(duration);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float precent = animation.getAnimatedFraction();
                int width = (int) (measuredWidth * precent);
                setWidth(view, width);
                if (precent == 1) {
                    valueAnimator.removeAllUpdateListeners();
                }
            }
        });
        valueAnimator.start();

    }

    private int getMode(int parentMeasureSpec) {

        if (parentMeasureSpec == MeasureSpec.EXACTLY) {
            return MeasureSpec.AT_MOST;
        } else if (parentMeasureSpec == MeasureSpec.AT_MOST) {
            return MeasureSpec.AT_MOST;
        } else {
            return parentMeasureSpec;
        }
    }

    private void setWidth(View view, int width) {
        ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
        layoutParams.width = width;
        view.setLayoutParams(layoutParams);
        view.requestLayout();
    }

    // 折疊
    private void collapse(final View view) {
        final int measuredHeight = view.getMeasuredHeight();
        final ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);
        valueAnimator.setDuration(duration);
        final int viewMeasuredWidth = view.getMeasuredWidth();

        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

            @Override
            public void onAnimationUpdate(ValueAnimator animation) {

                float precent = animation.getAnimatedFraction();
                Log.i(TAG, "onAnimationUpdate: precent" + precent);
                int width = (int) (viewMeasuredWidth - viewMeasuredWidth * precent);
                setWidth(view, width);
//                動畫履行結束的時候，設置View為View.GONE，同時移除監聽器
                if (precent == 1) {
                    view.setVisibility(View.GONE);
                    valueAnimator.removeAllUpdateListeners();
                }
            }
        });
        valueAnimator.start();
    }
}

```

思路解析

如圖所示，圖逐一4個部份組成，數字，標題，箭頭，圖片，點擊標題所在的那1行，圖片回相應地隱藏或顯示。
數字，標題，箭頭都在同1個相對布局里面，圖片在單獨的1個相對布局中，整體由 LinearLayout構成，布局文件以下

```

<?xml version="1.0" encoding="utf⑻"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:background="#ffffff"
              android:orientation="vertical">
    <RelativeLayout
        android:id="@+id/titleRelativeLayout"
        android:padding="30px"
        android:layout_width="match_parent"
        android:layout_height="170px"
        android:clickable="true">

        <TextView
            android:id="@+id/numberTextView"
            android:layout_width="70px"
            android:layout_height="70px"
            android:gravity="center"
            android:layout_centerVertical="true"

            android:clickable="false"
            android:text="1"
            android:textStyle="bold"
            android:textColor="#EBEFEC"
            android:textSize="35px" />

        <TextView
            android:id="@+id/titleTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_toRightOf="@id/numberTextView"
            android:layout_marginLeft="30px"
            android:clickable="false"
            android:textColor="#1d953f"
            android:textSize="46px" />


        <ImageView
            android:id="@+id/arrowImageView"
            android:layout_width="48px"
            android:layout_height="27px"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:background="@mipmap/arrow_down"
            android:clickable="false"
            android:scaleType="fitCenter" />
    </RelativeLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="2px"
        android:layout_below="@id/titleRelativeLayout"
        android:background="#E7E7EF"
        android:clickable="false"
        />

    <RelativeLayout
        android:id="@+id/contentRelativeLayout"
        android:visibility="gone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </RelativeLayout>

</LinearLayout>

```

把contentRelativeLayout的visibility設置為android:visibility="gone"，是由于1開始不用加載這個相對局部，這樣它不會占用位置

3. 在代碼中初始化布局，并給 mTitleRelativeLayout設置點擊事件。

 mTitleRelativeLayout.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    rotateArrow();
                }
            });

我們來看 rotateArrow()里面我們做了甚么，其實就是根據相應的動畫履行箭頭旋轉的動作和更改 contentRelativeLayout的高度核心代碼以下：

  int degree = 0;
  if (mArrowImageView.getTag() == null || mArrowImageView.getTag().equals(true)) {
        mArrowImageView.setTag(false);
        degree = ⑴80;
        expand(mContentRelativeLayout);
   } else {
        degree = 0;
        mArrowImageView.setTag(true);
        collapse(mContentRelativeLayout);
   }
   mArrowImageView.animate().setDuration(duration).rotation(degree);

我們在來看1下在expand我們做了甚么，其實就是給contentRelativeLayout履行1個動畫，在動畫的履行進程中不斷改變contentRelativeLayout的高度，注意在履行動畫之前，我們需要小調用view.measure(childWidthMode, childHeightMode);方法，這樣我們可能獲得到高度

    view.setVisibility(View.VISIBLE);
    int childWidthMode = getMode(parentWidthMeasureSpec);
    int childHeightMode = getMode(parentHeightMeasureSpec);
    view.measure(childWidthMode, childHeightMode);
    final int measuredWidth = view.getMeasuredWidth();
    final int measuredHeight = view.getMeasuredHeight();

    final ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);
    valueAnimator.setDuration(duration);
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            float precent = animation.getAnimatedFraction();
            int width = (int) (measuredWidth * precent);
            setWidth(view, width);
            // 動畫履行結束的時候，同時移除監聽器
            if (precent == 1) {
                valueAnimator.removeAllUpdateListeners();
            }
        }
    });
    valueAnimator.start();

反之，隱藏也是履行1個動畫，不斷改變高度，只不太高度是愈來愈小，直至為0為止

圖1的源碼分析到此為止，源碼下載地址：https://github.com/gdutxiaoxu/CustomViewDemo2.git

圖2源碼分析

源碼下載地址

1.思路解析，

1）首先我們自己自定義1個CustomImageView,在這個類里面我們給其提供了1個方法

public void setImageUrl(String url)；

在這個方法里面其實我們做的工作就是Picasso框架加載圖片，即圖片交給CustomImageView自己去加載，更符合面向對象的4位

    if (!TextUtils.isEmpty(url)) {
        this.url = url;
        if (isAttachedToWindow) {
            Picasso.with(getContext()).load(url).placeholder(new ColorDrawable(Color.parseColor("#f5f5f5"))).into(this);
        }
    }

2）接著我們自定義1個NineGridlayout，繼承ViewGroup，在這個類里面我們主要做的工作就是添加孩子，并肯定每一個孩子的位置

首先我們在構造方法里面初始化我們控件需要的寬度

public NineGridlayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    ScreenTools screenTools=ScreenTools.instance(getContext());
  //        初始總寬度
    totalWidth=screenTools.getScreenWidth()-screenTools.dip2px(80);
}

接著我們提供了setImagesData（）方法，基本所有的邏輯都放在這里

首先我們先根據孩子的數量肯定有多少行多少列
接著判斷是不是需要復用，不需要復用的話，直接添加孩子，需要復用的話，判斷需要新設置的孩子的數量是不是大于緩存的孩子的數量，小于的話，繼續添加孩子，知道孩子的數量到達我們需要的孩子的數量為止，小于的話，移除過剩的緩存的孩子的數量
接著再擺放每一個孩子的位置，并設置它的Url

注意我們這里之所以需要判斷是不是需要復用，是由于ListView或RecyclerView的緩存機制，若每次setImagesData（）的時候直接添加，會致使添加多個孩子，若直接移除所有孩子的話，性能相對來講較差，所以我們進行緩存，到此源碼分析位置。

代碼以下

/**
 * 博客地址：http://blog.csdn.net/gdutxiaoxu
 * @author xujun
 * @time 2015/11/27 16:13.
 */
public class NineGridlayout extends ViewGroup {

    /**
     * 圖片之間的間隔
     */
    private int gap = 5;
    private int columns;//列數
    private int rows;//行數
    private List listData;
    private int totalWidth;

    private final int MAX_COLUMNS=3;
    private final int MAX_ROW3=3;

    public NineGridlayout(Context context) {
        this(context,null);
    }

    public NineGridlayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        ScreenTools screenTools=ScreenTools.instance(getContext());
//        初始總寬度
        totalWidth=screenTools.getScreenWidth()-screenTools.dip2px(80);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

    }
    private void layoutChildrenView(){
        int childrenCount = listData.size();

        int singleWidth = (totalWidth - gap * (3 - 1)) / 3;
        int singleHeight = singleWidth;


        /**
         * 根據子view數量肯定高度,這里直接調用setLayoutParams設置NineGridlayout的高度
         * 
         */

        LayoutParams params = getLayoutParams();
        int marginHeight = getPaddingTop() + getPaddingTop();
        params.height = singleHeight * rows + gap * (rows - 1)+marginHeight;
        setLayoutParams(params);

//擺放孩子的位置
        for (int i = 0; i < childrenCount; i++) {
            CustomImageView childrenView = (CustomImageView) getChildAt(i);
            childrenView.setImageUrl(((Image) listData.get(i)).getUrl());
            int[] position = findPosition(i);

//            加上getPaddingLeft（），為了支持Padding屬性
            int left = (singleWidth + gap) * position[1]+getPaddingLeft();
            int top = (singleHeight + gap) * position[0]+getPaddingTop();
            int right = left + singleWidth;
            int bottom = top + singleHeight;

            childrenView.layout(left, top, right, bottom);
        }

    }


    private int[] findPosition(int childNum) {
        int[] position = new int[2];
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                if ((i * columns + j) == childNum) {
                    position[0] = i;//行
                    position[1] = j;//列
                    break;
                }
            }
        }
        return position;
    }

    public int getGap() {
        return gap;
    }

    public void setGap(int gap) {
        this.gap = gap;
    }


    public void setImagesData(List<Image> lists) {
        if (lists == null || lists.isEmpty()) {
            return;
        }
        //初始化布局
        generateChildrenLayout(lists.size());
        //這里做1個重用view的處理
        if (listData == null) {
            int i = 0;
            while (i < lists.size()) {
                CustomImageView iv = generateImageView();
                addView(iv,generateDefaultLayoutParams());
                i++;
            }
        } else {
            int oldViewCount = listData.size();
            int newViewCount = lists.size();
            if (oldViewCount > newViewCount) {
                removeViews(newViewCount - 1, oldViewCount - newViewCount);
            } else if (oldViewCount < newViewCount) {
                for (int i = 0; i < newViewCount - oldViewCount; i++) {
                    CustomImageView iv = generateImageView();
                    addView(iv,generateDefaultLayoutParams());
                }
            }
        }
        listData = lists;
        layoutChildrenView();
    }


    /**
     * 根據圖片個數肯定行列數量
     * 對應關系以下
     * num  row column
     * 1       1    1
     * 2       1    2
     * 3       1    3
     * 4       2    2
     * 5       2    3
     * 6       2    3
     * 7       3    3
     * 8       3    3
     * 9       3    3
     *
     * @param length
     */
    private void generateChildrenLayout(int length) {
        if (length <= MAX_COLUMNS) {
            rows = 1;
            columns = length;
        } else if (length <= MAX_COLUMNS*2) {
            rows = 2;
            columns = MAX_COLUMNS;
            if (length == MAX_COLUMNS+1) {
                columns = 2;
            }
        } else {
            rows = 3;
            columns = MAX_COLUMNS;
        }
    }

    private CustomImageView generateImageView() {
        CustomImageView iv = new CustomImageView(getContext());
        iv.setScaleType(ImageView.ScaleType.CENTER_CROP);
        iv.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
        iv.setBackgroundColor(Color.parseColor("#f5f5f5"));
        return iv;
    }


}

圖2源碼下載地址

圖1源碼下載地址：

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