Menu

package com.example.a221menu;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupMenu;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private TextView textView;

    private Button button;

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

        textView = findViewById(R.id.tv_show);

        button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PopupWindow popupWindow = new PopupWindow(MainActivity.this);

                View inflate = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_layout, null);

                popupWindow.setContentView(inflate);
                popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
                popupWindow.setWidth(300);

                popupWindow.showAsDropDown(button);
            }
        });

        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PopupMenu popupMenu = new PopupMenu(MainActivity.this, textView);

                popupMenu.inflate(R.menu.menu);

                popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {

                        int itemId = item.getItemId();

                        switch (itemId){
                            case R.id.blue:
                                Toast.makeText(MainActivity.this, "111", Toast.LENGTH_SHORT).show();
                                break;
                            case R.id.green:
                                Toast.makeText(MainActivity.this, "22", Toast.LENGTH_SHORT).show();
                                break;
                            case R.id.red:
                                Toast.makeText(MainActivity.this, "33", Toast.LENGTH_SHORT).show();
                                break;
                        }

                        return false;
                    }
                });

                popupMenu.show();
            }
        });



    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {

        getMenuInflater().inflate(R.menu.menu,menu);

        super.onCreateContextMenu(menu, v, menuInfo);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {

        int id = item.getItemId();

        switch (id){
            case R.id.red:
                Toast.makeText(this, "红色", Toast.LENGTH_SHORT).show();
                break;
            case R.id.green:
                Toast.makeText(this, "绿色", Toast.LENGTH_SHORT).show();
                break;
            case R.id.blue:
                Toast.makeText(this, "蓝色", Toast.LENGTH_SHORT).show();
                break;
        }

        return super.onContextItemSelected(item);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu,menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        switch (id){
            case R.id.red:
                Toast.makeText(this, "红色", Toast.LENGTH_SHORT).show();
                break;
            case R.id.green:
                Toast.makeText(this, "绿色", Toast.LENGTH_SHORT).show();
                break;
            case R.id.blue:
                Toast.makeText(this, "蓝色", Toast.LENGTH_SHORT).show();
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}