流式布局(根据字符串长度)

MainActivity

public class MainActivity extends AppCompatActivity {

    List strList=new ArrayList<>();
    private CustomView customView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }
    private void initView(){
        final EditText editText = findViewById(R.id.edit);
        customView = findViewById(R.id.water_fall);
        //customView =new CustomView(MainActivity.this);
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 获取输入框文字
                String str = editText.getText().toString();
                // 将文字放入列表
                strList.add(str);
                // 设置数据
                customView.setStringList(strList);
            }
        });
    }
}

自定义view

public class CustomView extends LinearLayout {

    //规定一行的字符串长度不能大于30  大于30就换行
    final int mMaxSize=30;
    List stringList=new ArrayList<>();
    Context mcontext;
    private TextView textView;
    private View view;

    public CustomView(Context context) {
        super(context);
        mcontext=context;
        init();
    }

    public CustomView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        mcontext=context;
        init();
    }

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

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

    public void setStringList(List stringList) {
        this.stringList = stringList;
        showList();
    }

    private void showList() {
        //因为每一次都要重新画，所以移除以前所有的布局
        removeAllViews();
        // 优先向根布局添加一条横向布局
        LinearLayout linearLayout_h= (LinearLayout) View.inflate(mcontext,R.layout.item_water_fall_h,null);
        addView(linearLayout_h);
        // 定义临时变量，用来计算最后一行已有的字符串长度
        int len=0;

        for(int i=0;imMaxSize){
                // 向根布局添加一条横向布局
                linearLayout_h= (LinearLayout) View.inflate(mcontext,R.layout.item_water_fall_h,null);
                addView(linearLayout_h);
                // 因为换行，所以这一个字符串长度就是最后一行长度
                len=stringList.get(i).length();
            }
            // 添加TextView,并赋值
            View view= View.inflate(mcontext,R.layout.item_water_fall,null);
            textView = view.findViewById(R.id.tv_item_water_fall);
            textView.setText(stringList.get(i));
            linearLayout_h.addView(view);

            // 设置权重，让每一行内所有控件相加充满整行，并合理分配
            LayoutParams layoutParams= (LayoutParams) view.getLayoutParams();
            layoutParams.weight=1;
            view.setLayoutParams(layoutParams);
            final int index=i;
            view.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(mcontext,stringList.get(index),Toast.LENGTH_SHORT).show();
                }
            });
            view.setOnLongClickListener(new OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    stringList.remove(index);
                    showList();
                    return true;
                }
            });
        }

    }

    private void init() {
        // 设置最外层的LinearLayout为垂直布局
        setOrientation(VERTICAL);
    }
}

activity_main.xml

纵向的LinearLayout

横向的LinearLayout

效果图

长按可以删除  点击可以Toast