仿应用商店推荐搜索流式布局

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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

public class FlowLayout extends ViewGroup {
    //
    private int usedWidth = 0;
    private static final int HORIZONTAL_SPACING = 30;
    private static final int VERTICAL_SPACING = 30;
    private Line currentLine;
    private List<Line> lines = new ArrayList<>();

    //
    public FlowLayout(Context context) {
        super(context);
    }

    public FlowLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //
        lines.clear();
        currentLine = null;
        usedWidth = 0;
        //
        int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
        // 测量子view
        measureChildren(widthMeasureSpec, heightMeasureSpec);
        // 将子view分行 当添加一个子view后，超出Width后，换行，将剩余空间平分给这一行中view；
        currentLine = new Line();
        for (int i = 0; i < getChildCount(); i++) {
            TextView childView = (TextView) getChildAt(i);
            int childViewMeasuredWidth = childView.getMeasuredWidth();
            usedWidth += childViewMeasuredWidth;
            if (usedWidth <= width) {
                currentLine.addView(childView);
                usedWidth += HORIZONTAL_SPACING;
                if (usedWidth > width) {
                    newline();
                }
            } else {
                newline();
                currentLine.addView(childView);
                usedWidth += childViewMeasuredWidth;
                usedWidth += HORIZONTAL_SPACING;
            }
        }
        if (!lines.contains(currentLine)) {
            lines.add(currentLine);
        }
        int totalHeight = 0;
        for (int i = 0; i < lines.size(); i++) {
            totalHeight += lines.get(i).getHeight();
        }
        totalHeight += (lines.size() - 1) * VERTICAL_SPACING;
        //
        setMeasuredDimension(width + getPaddingLeft() + getPaddingRight(), totalHeight + getPaddingTop() + getPaddingBottom());

    }

    private void newline() {
        lines.add(currentLine);
        currentLine = new Line();
        usedWidth = 0;
    }
    // 指定每一行的位置
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        l += getPaddingLeft();
        t += getPaddingTop();
        for (int i = 0; i < lines.size(); i++) {
            Line line = lines.get(i);
            line.layout(l, t);
            t += line.getHeight();
            t += VERTICAL_SPACING;
        }
    }

    private class Line {
        private List<View> children = new ArrayList<>();
        private int height;
        private int lineWidth;

        public void addView(View view) {
            children.add(view);
            if (height < view.getMeasuredHeight()) {
                height = view.getMeasuredHeight();
            }
            lineWidth += view.getMeasuredWidth();
        }

        public int getHeight() {
            return height;
        }

       // 自定每一行的view位置
        public void layout(int l, int t) {

            int r = 0;
            int ramaind = getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - lineWidth - (children.size() - 1) * HORIZONTAL_SPACING;
            if (children.size() > 0) {
                r = ramaind / children.size();
            }
            for (int i = 0; i < children.size(); i++) {
                View view = children.get(i);
                view.layout(l, t, l + view.getMeasuredWidth() + r, t + view.getMeasuredHeight());
                l += view.getMeasuredWidth();
                l += HORIZONTAL_SPACING;
                l += r;
            }
        }
    }
}

import android.content.Context;
import android.graphics.Camera;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.support.v7.widget.AppCompatTextView;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Toast;

/**
 * 自定义排序TextView
 */

public class MytextView extends AppCompatTextView {

    private Camera camera;
    private Matrix matrix;

    public MytextView(Context context) {
        super(context);
        init();
    }

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

    private void init() {
        camera = new Camera();
        matrix = new Matrix();
        setOnClickListener(onClickListener);
    }
    private OnClickListener onClickListener =new OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getContext(), getText().toString(), Toast.LENGTH_SHORT).show();
            show=true;
            invalidate();
        }
    };
    protected boolean show;
    private final static int FPS = 1000 / 60;
    private int degrees=0;

    @Override
    public void draw(Canvas canvas) {
        // 绕X轴3d旋转
        if(show && degrees<=360){
            int cx = getWidth()/2;
            int cy = getHeight()/2;
            camera.save();
            camera.rotateX(degrees);
            camera.getMatrix(matrix);
            camera.restore();
            //
            matrix.preTranslate(-cx,-cy);
            matrix.postTranslate(cx,cy);
            //
            canvas.concat(matrix);
            degrees+=20;
            postInvalidateDelayed(FPS);
        }else{
            degrees=0;
        }
        super.draw(canvas);

    }

    @Override
    protected void onDraw(Canvas canvas) {
        // 添加剩余空间后，字体不居中，移动canvas 字体居中
        int width = getWidth();
        float text_with = getPaint().measureText(getText().toString());
        canvas.translate((width-text_with-getPaddingLeft()-getPaddingRight())/2,0);
        super.onDraw(canvas);
        //

    }

public class RankingActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         initView();
    }

    private void initView() {
        //初始化view
        ScrollView scrollView = new ScrollView(this);
        FlowLayout layout = new FlowLayout(this);
        int padding = 20;
        layout.setPadding(padding,padding,padding,padding);
        scrollView.addView(layout);
        TextView textView = null;
        Random random = new Random();
        int backColor = 0xffcecece;
        int textPaddingV = 12;
        int textPaddingH = 10;
        for (int i = 0; i < Images.rank.length; i++) {
            final String text = Images.rank[i];
            textView = new MytextView(this);
            textView.setText(text);
            // 随机选择背景颜色
            int red = random.nextInt(188)+20;
            int green = random.nextInt(188) + 20;
            int blue = random.nextInt(188) + 20;
            int color = Color.rgb(red, green, blue);
            textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP,20);
            textView.setBackground(createStateListDrawable(createShape(backColor), createShape(color)));
            textView.setTextColor(Color.WHITE);
            textView.setPadding(textPaddingH, textPaddingV, textPaddingH, textPaddingV);
            layout.addView(textView, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, -2));

        }
        setContentView(scrollView);
    }
    public  StateListDrawable createStateListDrawable(Drawable pressedDrawable, Drawable normalDrawable){
        StateListDrawable stateListDrawable = new StateListDrawable();
        stateListDrawable.addState(new int[]{android.R.attr.state_pressed},pressedDrawable);
        stateListDrawable.addState(new int[]{},normalDrawable);
        return stateListDrawable;
    }
    public  GradientDrawable createShape(int color){
        GradientDrawable drawable = new GradientDrawable();
        drawable.setCornerRadius(10);
        drawable.setColor(color);
        return drawable;
    }