流式布局

//流式布局的写法
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.myview.R;
import com.example.myview.utils.DisPlayUtils;

import java.util.ArrayList;

/**
 * 继承的ViewGroup的子类容器布局
 */
public class MyFlowLayout extends LinearLayout {
    private int mScrrenWidth;
    private int dpValue;
    private int dpValueTwo;
    private int positon;

    public MyFlowLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        //得到屏幕的宽
        mScrrenWidth = getResources().getDisplayMetrics().widthPixels;
        //把dp专程px
        dpValue = DisPlayUtils.dip2px(8, getResources().getDisplayMetrics().density);
        dpValueTwo = DisPlayUtils.dip2px(5, getResources().getDisplayMetrics().density);
        setOrientation(VERTICAL);
    }

    public void setAdapter(ArrayList<String> list, final ClickItem clickItem) {//{"lvxx","memeda"}
        LinearLayout linearLayout = getLine();
        for (int i = 0; i < list.size(); i++) {

            int numWidth = 0;
            //getChildCount获取它里面的所有子控件
            for (int j = 0; j < linearLayout.getChildCount(); j++) {
                TextView tv = (TextView) linearLayout.getChildAt(j);
                //为了左边距和右边距
                LayoutParams params = (LayoutParams) tv.getLayoutParams();
                //测量TextView的宽和高
                //参数1：返回此视图的原始测量宽度 参数2：返回此视图的原始测量高度
                tv.measure(getMeasuredWidth(), getMeasuredHeight());
                int tvWidth = tv.getMeasuredWidth() + params.rightMargin + params.leftMargin + tv.getPaddingLeft() + tv.getPaddingRight();
                numWidth += tvWidth;
            }

            TextView tv = getText();
            LayoutParams layoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            layoutParams.leftMargin = dpValue;
            layoutParams.rightMargin = dpValue;
            layoutParams.topMargin = dpValue;
            tv.setLayoutParams(layoutParams);
            tv.setText(list.get(i) + "");
            tv.measure(getMeasuredWidth(), getMeasuredHeight());
            positon = i;
            tv.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (clickItem != null) {
                        clickItem.onItemClick(positon);
                    }
                }
            });

            int measuredWidth = tv.getMeasuredWidth();
            if (mScrrenWidth > (numWidth + measuredWidth)) {
                linearLayout.addView(tv);
            } else {
                linearLayout = getLine();
                linearLayout.addView(tv);
            }

        }

    }

    //每行要展示的布局
    private LinearLayout getLine() {
        LinearLayout linearLayout = new LinearLayout(getContext());
        linearLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
        this.addView(linearLayout);
        return linearLayout;
    }

    //初始化TextView用来展示数据
    private TextView getText() {
        TextView tv = new TextView(getContext());
        tv.setTextSize(16);
        tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        tv.setBackgroundResource(R.drawable.text_style);
        tv.setPadding(dpValue, dpValueTwo, dpValue, dpValueTwo);
        return tv;
    }

    public interface ClickItem {
        void onItemClick(int position);
    }
}

//主页面要执行的操作

/**
 * 流式布局
 * 应用场景 搜索记录
 */
public class MainActivity extends AppCompatActivity {
    private MyFlowLayout myFlowLayout;
    private ArrayList<String> mlist = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        initViews();
//调用了两遍方法
        myFlowLayout.setAdapter(mlist, new MyFlowLayout.ClickItem() {
            @Override
            public void onItemClick(int position) {
                Toast.makeText(MainActivity.this, mlist.get(position), Toast.LENGTH_SHORT).show();
            }
        });
        myFlowLayout.setAdapter(mlist, new MyFlowLayout.ClickItem() {
            @Override
            public void onItemClick(int position) {
                Toast.makeText(MainActivity.this, mlist.get(position), Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void initData() {
        mlist.add("吕英俊");
        mlist.add("吕潇洒");
        mlist.add("吕小帅");
        mlist.add("赵丑八怪");
        mlist.add("成鱼落雁");
        mlist.add("王锐");
        mlist.add("郑可心");
    }

    private void initViews() {
        myFlowLayout = findViewById(R.id.My_Flow_Layout);
    }
}