点击某个按钮，让菜单选项从按钮周围指定位置弹出。

 

Android Material Design：PopupMenu

Android Material Design 引入的PopupMenu类似过去的上下文菜单，但是更灵活。 如图所示：

现在给出实现上图PopupMenu的代码。 本例是一个普通的Button触发弹出PopupMenu。

测试的MainActivity.java ：

package zhangphil.materialdesign;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

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

        final Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                showPopupMenu(button);
            }
        });
    }

    private void showPopupMenu(View view) {
        // View当前PopupMenu显示的相对View的位置
        PopupMenu popupMenu = new PopupMenu(this, view);

        // menu布局
        popupMenu.getMenuInflater().inflate(R.menu.main, popupMenu.getMenu());

        // menu的item点击事件
        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                Toast.makeText(getApplicationContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
                return false;
            }
        });

        // PopupMenu关闭事件
        popupMenu.setOnDismissListener(new PopupMenu.OnDismissListener() {
            @Override
            public void onDismiss(PopupMenu menu) {
                Toast.makeText(getApplicationContext(), "关闭PopupMenu", Toast.LENGTH_SHORT).show();
            }
        });

        popupMenu.show();
    }
}

package zhangphil.materialdesign;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

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

		final Button button = (Button) findViewById(R.id.button);
		button.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				showPopupMenu(button);
			}
		});
	}

	private void showPopupMenu(View view) {
		// View当前PopupMenu显示的相对View的位置
		PopupMenu popupMenu = new PopupMenu(this, view);

		// menu布局
		popupMenu.getMenuInflater().inflate(R.menu.main, popupMenu.getMenu());

		// menu的item点击事件
		popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
			@Override
			public boolean onMenuItemClick(MenuItem item) {
				Toast.makeText(getApplicationContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
				return false;
			}
		});

		// PopupMenu关闭事件
		popupMenu.setOnDismissListener(new PopupMenu.OnDismissListener() {
			@Override
			public void onDismiss(PopupMenu menu) {
				Toast.makeText(getApplicationContext(), "关闭PopupMenu", Toast.LENGTH_SHORT).show();
			}
		});

		popupMenu.show();
	}
}

MainActivity.java需要的activity_main布局文件只含一个普通的Android Button，在次不再赘述。

位于menu目录下的main.xml：

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" >

    <item
        android:id="@+id/action_open"
        android:orderInCategory="100"
        android:title="打开"
        app:showAsAction="never"/>
    <item
        android:id="@+id/action_new"
        android:orderInCategory="100"
        android:title="新建"
        app:showAsAction="never"/>
    <item
        android:id="@+id/action_del"
        android:orderInCategory="100"
        android:title="删除"
        app:showAsAction="never"/>

</menu>