System menu OptionsMenu

Code display

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/red" android:title="Red"></item>
    <item android:id="@+id/black" android:title="black"></item>
    <item android:id="@+id/yellow" android:title="yellow"></item>
</menu>

public class MainActivity extends AppCompatActivity {

    private TextView tvText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }
    //Refer to the file in the layout menu in this method
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    //Click events
    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        int itemId = item.getItemId();
        switch (itemId) {
            case R.id.red:
                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.yellow:
                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.black:
                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }
}

Effect display

Matters needing attention

First, you need to create the resource file menu package under res.
Second, click on the layout file. You must reference the layout file on the page you want to display.

Context menucontextmenu

Code display

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/red" android:title="Red"></item>
    <item android:id="@+id/black" android:title="black"></item>
    <item android:id="@+id/yellow" android:title="yellow"></item>
</menu>

 private void initView() {
        tvText = (TextView) findViewById(R.id.tv_text);
        //Bind the menu to this control
        registerForContextMenu(tvText);
    }

    //Long press context menu

    @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(@NonNull MenuItem item) {
        int itemId = item.getItemId();
        switch (itemId){
            case R.id.red:
                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.yellow:
                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.black:
                Toast.makeText(this, item.getTitle(), Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onContextItemSelected(item);
    }

Effect display

Matters needing attention

You must bind the menu to this control and execute the registerForContextMenu method, otherwise it will not work.
Then it's a long Click to get an effect.

Pop-up Menu

Code display

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/one" android:title="First"></item>
    <item android:id="@+id/two" android:title="The second"></item>
</menu>

public class Main2Activity extends AppCompatActivity {

    private TextView tvShow;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        initView();
    }

    private void initView() {
        tvShow = (TextView) findViewById(R.id.tv_show);
        tvShow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Two parameters, one is context and the other is menu under the specified control
                PopupMenu popupMenu = new PopupMenu(Main2Activity.this,tvShow);
                //Loading layout
                popupMenu.inflate(R.menu.pop_menu);
                //Monitoring events
                popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem menuItem) {
                        int itemId = menuItem.getItemId();
                        switch (itemId){
                            case R.id.one:
                                tvShow.setTextColor(Color.parseColor("#027FFD"));
                                break;
                            case R.id.two:
                                tvShow.setTextColor(Color.parseColor("#AC78B0"));
                        }
                        return false;
                    }
                });
                //Display layout
                popupMenu.show();
            }
        });
    }
}

Effect display

PopupWindow window

Code display

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="First"
        android:textSize="30sp"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="The second"
        android:textSize="30sp"/>
</LinearLayout>

public class Main3Activity extends AppCompatActivity {

    private Button btnButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        initView();
    }

    private void initView() {
        btnButton = (Button) findViewById(R.id.btn_button);
        //Set click event
        btnButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //create object
                PopupWindow popupWindow = new PopupWindow(Main3Activity.this);
                //Loading layout
                View inflate = LayoutInflater.from(Main3Activity.this).inflate(R.layout.pop_layout, null);
                //Set up three elements
                popupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
                popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
                popupWindow.setContentView(inflate);

                //Set the blank and click Cancel
                popupWindow.setOutsideTouchable(true);
                //Set where to appear
                popupWindow.showAsDropDown(btnButton,400,400);
            }
        });
    }
}

Effect display

Matters needing attention

First of all, the window is equivalent to a layout, all of which must be written first.
Secondly, the necessary three attributes are indispensable: height, width and content loading.