Android自定義View實現標籤流效果

<declare-styleable name="FlowTagView">
        <attr name="lineSpacing" format="dimension" />
        <attr name="tagSpacing" format="dimension" />
        <!-- 是否是固定佈局 -->
        <attr name="isFixed" format="boolean" />
        <attr name="columnSize" format="integer" />
</declare-styleable>

package com.czhappy.effectdemo.flowtag;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;

import com.czhappy.effectdemo.R;

/**
 * Description:
 * User: chenzheng
 * Date: 2017/2/17 0017
 * Time: 10:23
 */
public class FlowTagConfig {

    private static final int DEFAULT_LINE_SPACING = 5;//預設行間距
    private static final int DEFAULT_TAG_SPACING = 10;//各個標籤之間的預設距離
    private static final int DEFAULT_FIXED_COLUMN_SIZE = 3; //預設列數

    private int lineSpacing;
    private int tagSpacing;
    private int columnSize;
    private boolean isFixed;

    public FlowTagConfig(Context context,AttributeSet attrs){
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlowTagView);
        try {
            lineSpacing = a.getDimensionPixelSize(R.styleable.FlowTagView_lineSpacing, DEFAULT_LINE_SPACING);
            tagSpacing = a.getDimensionPixelSize(R.styleable.FlowTagView_tagSpacing, DEFAULT_TAG_SPACING);
            columnSize = a.getInteger(R.styleable.FlowTagView_columnSize, DEFAULT_FIXED_COLUMN_SIZE);
            isFixed = a.getBoolean(R.styleable.FlowTagView_isFixed,false);
        } finally {
            a.recycle();
        }
    }

    public int getLineSpacing() {
        return lineSpacing;
    }

    public void setLineSpacing(int lineSpacing) {
        this.lineSpacing = lineSpacing;
    }

    public int getTagSpacing() {
        return tagSpacing;
    }

    public void setTagSpacing(int tagSpacing) {
        this.tagSpacing = tagSpacing;
    }

    public int getColumnSize() {
        return columnSize;
    }

    public void setColumnSize(int columnSize) {
        this.columnSize = columnSize;
    }

    public boolean isFixed() {
        return isFixed;
    }

    public void setIsFixed(boolean isFixed) {
        this.isFixed = isFixed;
    }
}

package com.czhappy.effectdemo.flowtag;

import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

/**
 * Description:
 * User: chenzheng
 * Date: 2017/2/17 0017
 * Time: 10:23
 */
public class FlowTagView extends ViewGroup {

    private int mLineSpacing;//行間距
    private int mTagSpacing;//各個標籤之間的距離
    private BaseAdapter mAdapter;
    private TagItemClickListener mListener;
    private DataChangeObserver mObserver;

    public FlowTagView(Context context) {
        super(context);
        init(context, null, 0);
    }

    public FlowTagView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs, 0);
    }

    public FlowTagView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs, defStyle);
    }

    private void init(Context context, AttributeSet attrs, int defStyle) {
        //獲取屬性
        FlowTagConfig config = new FlowTagConfig(context, attrs);
        mLineSpacing = config.getLineSpacing();
        mTagSpacing = config.getTagSpacing();
    }

    private void drawLayout() {
        if (mAdapter == null || mAdapter.getCount() == 0) {
            return;
        }

        this.removeAllViews();

        for (int i = 0; i < mAdapter.getCount(); i++) {
            View view = mAdapter.getView(i,null,null);
            final int position = i;
            view.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mListener != null) {
                        mListener.itemClick(position);
                    }
                }
            });
            this.addView(view);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int wantHeight = 0;
        int wantWidth = resolveSize(0, widthMeasureSpec);
        int paddingLeft = getPaddingLeft();
        int paddingRight = getPaddingRight();
        int paddingTop = getPaddingTop();
        int paddingBottom = getPaddingBottom();
        int childLeft = paddingLeft;
        int childTop = paddingTop;
        int lineHeight = 0;

        //固定列的數量所需要的程式碼
        for (int i = 0; i < getChildCount(); i++) {
            final View childView = getChildAt(i);
            LayoutParams params = childView.getLayoutParams();
            childView.measure(
                    getChildMeasureSpec(widthMeasureSpec, paddingLeft + paddingRight, params.width),
                    getChildMeasureSpec(heightMeasureSpec, paddingTop + paddingBottom, params.height)
            );
            //獲取單個tag的寬高
            int childHeight = childView.getMeasuredHeight();
            int childWidth = childView.getMeasuredWidth();
            lineHeight = Math.max(childHeight, lineHeight);

            //超過長度的新起一行
            if (childLeft + childWidth + paddingRight > wantWidth) {
                childLeft = paddingLeft;
                childTop += mLineSpacing + childHeight;
                lineHeight = childHeight;
            }

            childLeft += childWidth + mTagSpacing;
        }
        wantHeight += childTop + lineHeight + paddingBottom;
        setMeasuredDimension(wantWidth, resolveSize(wantHeight, heightMeasureSpec));
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        //固定列的數量所需要的程式碼

        int width = r - l;
        int paddingLeft = getPaddingLeft();
        int paddingTop = getPaddingTop();
        int paddingRight = getPaddingRight();
        int childLeft = paddingLeft;
        int childTop = paddingTop;
        int lineHeight = 0;

        for (int i = 0; i < getChildCount(); i++) {
            final View childView = getChildAt(i);
            if (childView.getVisibility() == View.GONE) {
                continue;
            }
            int childWidth = childView.getMeasuredWidth();
            int childHeight = childView.getMeasuredHeight();
            lineHeight = Math.max(childHeight, lineHeight);

            if (childLeft + childWidth + paddingRight > width) {
                childLeft = paddingLeft;
                childTop += mLineSpacing + lineHeight;
                lineHeight = childHeight;
            }

            childView.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
            childLeft += childWidth + mTagSpacing;
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }

    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new LayoutParams(this.getContext(), attrs);
    }

    public void setAdapter(BaseAdapter adapter){
        if (mAdapter == null){
            mAdapter = adapter;
            if (mObserver == null){
                mObserver = new DataChangeObserver();
                mAdapter.registerDataSetObserver(mObserver);
            }
            drawLayout();
        }
    }

    public void setItemClickListener(TagItemClickListener mListener) {
        this.mListener = mListener;
    }

    /**
     * 單擊監聽介面
     */
    public interface TagItemClickListener {
        void itemClick(int position);
    }

    class DataChangeObserver extends DataSetObserver {
        @Override
        public void onChanged() {
            FlowTagView.this.drawLayout();
        }

        @Override
        public void onInvalidated() {
            super.onInvalidated();
        }
    }
}

package com.czhappy.effectdemo.activity;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

import com.czhappy.effectdemo.R;
import com.czhappy.effectdemo.adapter.EvaluateAdapter;
import com.czhappy.effectdemo.flowtag.FlowTagView;
import com.czhappy.effectdemo.model.Evaluate;

import java.util.ArrayList;
import java.util.List;

/**
 * Description:
 * User: chenzheng
 * Date: 2017/2/17 0017
 * Time: 11:47
 */
public class FlowTagActivity extends AppCompatActivity {


    private FlowTagView mContainer;
    private EvaluateAdapter adapter;
    private List<Evaluate> chooseList = new ArrayList<Evaluate>();

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_flowtag);

        initView();
        initData();
    }

    private void initData() {
        List<Evaluate> list = new ArrayList();
        Evaluate e1 = new Evaluate("熱情", "1");
        Evaluate e2 = new Evaluate("服務周到", "2");
        Evaluate e3 = new Evaluate("一般", "3");
        Evaluate e4 = new Evaluate("技術活槓槓的", "4");
        Evaluate e5 = new Evaluate("專業精通", "5");
        Evaluate e6 = new Evaluate("只會吹牛逼", "6");
        Evaluate e7 = new Evaluate("地下第一僅此一家", "7");
        list.add(e1);
        list.add(e2);
        list.add(e3);
        list.add(e4);
        list.add(e5);
        list.add(e6);
        list.add(e7);
        adapter.setItems(list);

    }

    private void initView() {
        mContainer = (FlowTagView) this.findViewById(R.id.container);
        adapter = new EvaluateAdapter(this);
        mContainer.setAdapter(adapter);
        mContainer.setItemClickListener(new FlowTagView.TagItemClickListener() {
            @Override
            public void itemClick(int position) {
                Evaluate e = (Evaluate) adapter.getItem(position);
                e.is_choosed = !e.is_choosed;
                if(e.is_choosed){
                    chooseList.add(e);
                }else{
                    chooseList.remove(e);
                }
                adapter.notifyDataSetChanged();
            }
        });
    }
}

package com.czhappy.effectdemo.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.czhappy.effectdemo.R;
import com.czhappy.effectdemo.model.Evaluate;

import java.util.ArrayList;
import java.util.List;


/**
 * Description:
 * User: chenzheng
 * Date: 2017/2/17 0017
 * Time: 11:43
 */
public class EvaluateAdapter extends BaseAdapter {

    private Context context;
    private LayoutInflater mInflater;
    private List<Evaluate> list;

    public EvaluateAdapter(Context context) {
        this.context = context;
        this.mInflater = LayoutInflater.from(context);
        this.list =  new ArrayList<Evaluate>();

    }

    public List<Evaluate> getList(){
        return list;
    }

    public void setItems(List<Evaluate> list){
        this.list = list;
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return list == null ? 0 : list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }
    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = mInflater.inflate(
                    R.layout.evaluate_grid_item, null);
            holder.evaluate_tv = (TextView)convertView.findViewById(R.id.evaluate_tv);
            convertView.setTag(holder);

        } else {

            holder = (ViewHolder) convertView.getTag();
        }

        final Evaluate ee = (Evaluate) getItem(position);
        holder.evaluate_tv.setText(ee.getName());
        if(ee.is_choosed){
            holder.evaluate_tv.setBackgroundResource(R.drawable.bg_round_corner_line_orange);
        }else{
            holder.evaluate_tv.setBackgroundResource(R.drawable.bg_round_corner_line_gray);
        }
        return convertView;
    }

    private final class ViewHolder {
        private TextView evaluate_tv;
    }
}

<?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:orientation="vertical">

    <com.czhappy.effectdemo.flowtag.FlowTagView
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        app:tagSpacing="10dp"
        app:lineSpacing="10dp"/>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <solid android:color="#ffffff" />

    <corners android:radius="5dp" />

    <stroke android:width="0.5dp"
        android:color="#FF6700"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <solid android:color="#ffffff" />

    <corners android:radius="5dp" />

    <stroke android:width="0.5dp"
        android:color="#cccccc"/>
</shape>