Menu菜单的几种分类

##Menu
1.OptionsMenu:出现在系统栏
2.ContextMenu:出现屏幕正中央（注册控件 长按来触发）
3.PopupMenu:出现在指定控件的下方（控件写点击事件来触发 可以有多个）
4.PopupWindow
特点：自定义布局，指定出现的位置
位置：
1.出现在某个控件的下方
2.出现在父容器的某个位置
常用方法
setContentView(自定义布局的View对象)
2.setWidth();
setHeight();
3.showAtLocation(父容器view对象,Gravity.Bottom,0,0);
4.showAsDorpdown(子控件,0,0,Gravity.Bottom)
5.view.getBackground.setAlph(100);
popupweindow.dismiss();关闭

//系统菜单
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu1,menu);
        return super.onCreateOptionsMenu(menu);
    }
    //子菜单点击事件
    @Override
    public boolean onOptionsItemSelected(@NonNull final MenuItem item) {
        switch (item.getItemId()){
            case R.id.menu:
                final PopupWindow popupWindow = new PopupWindow();
                View view2 = LayoutInflater.from(this).inflate(R.layout.iteam,null);
                //设置内容
                popupWindow.setContentView(view2);
                //指定宽高
                popupWindow.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);
                popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
                popupWindow.showAtLocation(view2,Gravity.TOP,0,0);
                final TextView textView2 = view2.findViewById(R.id.iv_qun);
                textView2.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(MainActivity.this, ""+textView2.getText().toString(), Toast.LENGTH_SHORT).show();
                        popupWindow.dismiss();
                    }
                });
                break;
            case R.id.menu1:
                final AlertDialog.Builder builder = new AlertDialog.Builder(this);
                View view= LayoutInflater.from(this).inflate(R.layout.item2,null);
                builder.setView(view);
                final EditText editText = view.findViewById(R.id.ed1);
                Button button = view.findViewById(R.id.bt1);
                builder.setTitle("增加菜品");
                builder.setIcon(R.mipmap.ic_launcher_round);
                final AlertDialog dialog = builder.create();
                button.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        String string = editText.getText().toString();
                        HashMap<String,String> map = new HashMap<>();
                        map.put("title",string);
                        list.add(map);
                        dialog.dismiss();
                    }
                });
                dialog.show();
                break;
            case R.id.menu2:
                AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
                builder1.setTitle("删除操作");
                builder1.setMessage("确定要删除删除？");
                builder1.setIcon(R.mipmap.ic_launcher);

                builder1.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        list.remove(0);
                        myAdapter.notifyDataSetChanged();
                    }
                });
                builder1.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "取消", Toast.LENGTH_SHORT).show();
                    }
                });
                AlertDialog dialog1 = builder1.create();
                dialog1.show();
                break;
            case R.id.menu3:
                Intent intent = new Intent();
                intent.setClass(MainActivity.this,Main2Activity.class);
                intent.putExtra("name","我是Activity1");
                startActivity(intent);
                break;
        }
        return super.onOptionsItemSelected(item);
    }
     //上下文菜单
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        getMenuInflater().inflate(R.menu.menu1,menu);
        super.onCreateContextMenu(menu, v, menuInfo);
    }

    @Override
    public boolean onContextItemSelected(@NonNull MenuItem item) {
        Toast.makeText(this, ""+item.getTitle().toString(), Toast.LENGTH_SHORT).show();
        return super.onContextItemSelected(item);
    }

    private void initDates() {
        HashMap<String,String> map = new HashMap<>();
        map.put("stage_id","1");
        map.put("limit","20");
        map.put("page","1");
        new MyThread(url,map).start();
    }
 //popupMenu
    public void popupMenu(View view) {
        PopupMenu menu = new PopupMenu(MainActivity.this,tv2);
        menu.inflate(R.menu.option);

        menu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem menuItem) {
                Log.e("onMenuItemClick: ",menuItem.getTitle().toString());
                return false;
            }
        });
        menu.show();

    }
//popupwindow
public void popupWindow(View view) {
        final PopupWindow popupWindow = new PopupWindow();
        View view1 = LayoutInflater.from(this).inflate(R.layout.item2_layout,null);
        popupWindow.setContentView(view1);

        popupWindow.setWidth(LinearLayout.LayoutParams.MATCH_PARENT);
        popupWindow.setHeight(LinearLayout.LayoutParams.MATCH_PARENT);

        //显示popupWindow   参数一:指定出现在哪个控件下
        //popupWindow.showAsDropDown(tv3,0,0, Gravity.BOTTOM);

        //显示在父容器布局中
        View parent = LayoutInflater.from(this).inflate(R.layout.activity_main,null);
        popupWindow.showAtLocation(parent, Gravity.BOTTOM,0,0);

//        final TextView lide = view1.findViewById(R.id.lide);
//        lide.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View view) {
//                Log.e("onClick: ",lide.getText().toString());
//                popupWindow.dismiss();
//            }
//        });

        //透明效果
        view1.getBackground().setAlpha(100);
        final Button bu1 = view1.findViewById(R.id.bu1);
        Button bu2 = view1.findViewById(R.id.bu2);

        bu1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("onClick: ","点赞");
                popupWindow.dismiss();
            }
        });
        bu2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("onClick: ","取消");
                popupWindow.dismiss();
            }
        });



    }

本文地址：https://blog.csdn.net/SimpleJerry/article/details/107372597