1. 程式人生 > >Android 自定義控制元件之打造流佈局實現熱門搜尋標籤

Android 自定義控制元件之打造流佈局實現熱門搜尋標籤

最終效果

首先來看看效果圖:
UI圖
其他地方很好實現,就是熱門搜尋有點麻煩,由於資料的不確定性,那麼像GridView明顯不能滿足了,這時候就只能自己來定義一個佈局了。

最終實現後的效果:

最終效果圖

具體實現

1,自定義一個類繼承ViewGroup

/**
 * 自定義流佈局
 * @author zhouyou
 */
public class ZFlowLayout extends ViewGroup{

    // 儲存所有子View
    private List<List<View>> mAllChildViews = new ArrayList<>();
    // 每一行的高度
private List<Integer> mLineHeight = new ArrayList<>(); public ZFlowLayout(Context context) { this(context, null); } public ZFlowLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ZFlowLayout(Context context, AttributeSet attrs, int
defStyle) { super(context, attrs, defStyle); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // 父控制元件傳進來的寬度和高度以及對應的測量模式 int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); int
sizeHeight = MeasureSpec.getSize(heightMeasureSpec); int modeHeight = MeasureSpec.getMode(heightMeasureSpec); // 如果當前ViewGroup的寬高為wrap_content的情況 int width = 0;// 自己測量的 寬度 int height = 0;// 自己測量的高度 // 記錄每一行的寬度和高度 int lineWidth = 0; int lineHeight = 0; // 獲取子view的個數 int childCount = getChildCount(); for(int i = 0;i < childCount; i++){ View child = getChildAt(i); // 測量子View的寬和高 measureChild(child, widthMeasureSpec, heightMeasureSpec); // 得到LayoutParams MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams(); // 子View佔據的寬度 int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; // 子View佔據的高度 int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; // 換行時候 if(lineWidth + childWidth > sizeWidth){ // 對比得到最大的寬度 width = Math.max(width, lineWidth); // 重置lineWidth lineWidth = childWidth; // 記錄行高 height += lineHeight; lineHeight = childHeight; }else{// 不換行情況 // 疊加行寬 lineWidth += childWidth; // 得到最大行高 lineHeight = Math.max(lineHeight, childHeight); } // 處理最後一個子View的情況 if(i == childCount -1){ width = Math.max(width, lineWidth); height += lineHeight; } } // wrap_content setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width, modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mAllChildViews.clear(); mLineHeight.clear(); // 獲取當前ViewGroup的寬度 int width = getWidth(); int lineWidth = 0; int lineHeight = 0; // 記錄當前行的view List<View> lineViews = new ArrayList<View>(); int childCount = getChildCount(); for(int i = 0;i < childCount; i ++){ View child = getChildAt(i); MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); int childWidth = child.getMeasuredWidth(); int childHeight = child.getMeasuredHeight(); // 如果需要換行 if(childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width){ // 記錄LineHeight mLineHeight.add(lineHeight); // 記錄當前行的Views mAllChildViews.add(lineViews); // 重置行的寬高 lineWidth = 0; lineHeight = childHeight + lp.topMargin + lp.bottomMargin; // 重置view的集合 lineViews = new ArrayList(); } lineWidth += childWidth + lp.leftMargin + lp.rightMargin; lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin); lineViews.add(child); } // 處理最後一行 mLineHeight.add(lineHeight); mAllChildViews.add(lineViews); // 設定子View的位置 int left = 0; int top = 0; // 獲取行數 int lineCount = mAllChildViews.size(); for(int i = 0; i < lineCount; i ++){ // 當前行的views和高度 lineViews = mAllChildViews.get(i); lineHeight = mLineHeight.get(i); for(int j = 0; j < lineViews.size(); j ++){ View child = lineViews.get(j); // 判斷是否顯示 if(child.getVisibility() == View.GONE){ continue; } MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); int cLeft = left + lp.leftMargin; int cTop = top + lp.topMargin; int cRight = cLeft + child.getMeasuredWidth(); int cBottom = cTop + child.getMeasuredHeight(); // 進行子View進行佈局 child.layout(cLeft, cTop, cRight, cBottom); left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; } left = 0; top += lineHeight; } } /** * 與當前ViewGroup對應的LayoutParams */ @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { return new MarginLayoutParams(getContext(), attrs); } }

2,佈局引入自定義View

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.hkddy8.flowlabledemo.MainActivity" >
    <com.hkddy8.flowlabledemo.view.ZFlowLayout
        android:id="@+id/flowLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</RelativeLayout>  

3,使用

public class MainActivity extends Activity {
    private ZFlowLayout mFlowLayout;
    private String[] mLabels = {"購物","美食","遊玩","北京","CSDN", "Airsaid", "周遊", "新春送祝福"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mFlowLayout = (ZFlowLayout) findViewById(R.id.flowLayout);
        initLabel();
    }
    // 初始化標籤
    private void initLabel() {
        MarginLayoutParams layoutParams = new MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        layoutParams.setMargins(30, 30, 10, 10);// 設定邊距
        for (int i = 0; i < mLabels.length; i++) {
            final TextView textView = new TextView(MainActivity.this);
            textView.setTag(i);
            textView.setTextSize(15);
            textView.setText(mLabels[i]);
            textView.setPadding(24, 11, 24, 11);
            textView.setTextColor(Color.BLACK);
            textView.setBackgroundResource(R.drawable.lable_item_bg_normal);
            mFlowLayout.addView(textView, layoutParams);
            // 標籤點選事件
            textView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(getApplicationContext(), mLabels[(int) textView.getTag()], Toast.LENGTH_SHORT).show();
                }
            });
        }
    }
}

其中背景的Shape程式碼:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <stroke
        android:width="1dp"
        android:color="#000000" />
</shape>