1. System menu Options Menu

Step flow

1. Create menu folders

2. Create. xml file under menu folder

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

3.Activity rewrites onCreateOptionsMenu load resource files

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

4.Activity rewrites onOptions ItemSelected plus event listening

   @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id){
            case R.id.red:
                Toast.makeText(this, "gules", Toast.LENGTH_SHORT).show();
                break;
            case R.id.blue:
                Toast.makeText(this, "blue", Toast.LENGTH_SHORT).show();
                break;
            case R.id.yello:
                Toast.makeText(this, "yellow", Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }

Note: An Activity has only one system menu

Context Menu

Step flow:

1. Create a menu folder under res and create an xml file as the layout file of ContextMenu. We reuse the menu layout above.

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

2.Activity rewrites onCreateConextMenu load resource files

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

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

3.Activity rewrites onConextItemSelected to set up event listening

@Override
    public boolean onContextItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id){
            case R.id.red:
                Toast.makeText(this, "gules", Toast.LENGTH_SHORT).show();
                break;
            case R.id.blue:
                Toast.makeText(this, "blue", Toast.LENGTH_SHORT).show();
                break;
            case R.id.yello:
                Toast.makeText(this, "yellow", Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onContextItemSelected(item);
    }

3. Pop-up menu

1. Implementation process:

Step 1: Create a menu folder under res and create a new xml file as the layout file for PoupMenu.

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

Step 2: Encapsulate PopupMenu related logic into showPopupMenu() method, including instantiation of PopupMenu, layout settings, display, click monitoring and response by adding MenuItem, etc.

public void popupMenu(){
        PopupMenu popupMenu = new PopupMenu(MainActivity.this, tv);
        popupMenu.inflate(R.menu.menu);
        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                int id = item.getItemId();
                switch (id){
                    case R.id.red:
                        Toast.makeText(MainActivity.this, "gules", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.blue:
                        Toast.makeText(MainActivity.this, "blue", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.yello:
                        Toast.makeText(MainActivity.this, "yellow", Toast.LENGTH_SHORT).show();
                        break;
                }
                return false;
            }
        });
        popupMenu.show();
    }

Step 3: Set up event listening for the control and call the showPopupMenu() method directly

tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                popupMenu();
            }
        });