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 ：

[java] view plaincopyprint?

1. package zhangphil.materialdesign;
2. import android.app.Activity;
3. import android.os.Bundle;
4. import android.support.v7.widget.PopupMenu;
5. import android.view.MenuItem;
6. import android.view.View;
7. import android.widget.Button;
8. import android.widget.Toast;
9. public class MainActivity extends Activity {
10. @Override
11. protected void onCreate(Bundle savedInstanceState) {
12. super.onCreate(savedInstanceState);
13. setContentView(R.layout.activity_main);
14. final Button button = (Button) findViewById(R.id.button);
15. button.setOnClickListener(new View.OnClickListener() {
16. @Override
17. public void onClick(View v) {
18. showPopupMenu(button);
19. }
20. });
21. }
22. private void showPopupMenu(View view) {
23. // View当前PopupMenu显示的相对View的位置
24. PopupMenu popupMenu = new PopupMenu(this, view);
25. // menu布局
26. popupMenu.getMenuInflater().inflate(R.menu.main, popupMenu.getMenu());
27. // menu的item点击事件
28. popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
29. @Override
30. public boolean onMenuItemClick(MenuItem item) {
31. Toast.makeText(getApplicationContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
32. return false;
33. }
34. });
35. // PopupMenu关闭事件
36. popupMenu.setOnDismissListener(new PopupMenu.OnDismissListener() {
37. @Override
38. public void onDismiss(PopupMenu menu) {
39. Toast.makeText(getApplicationContext(), "关闭PopupMenu", Toast.LENGTH_SHORT).show();
40. }
41. });
42. popupMenu.show();
43. }
44. }

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：

[html] view plaincopyprint?

1. <menu xmlns:android="http://schemas.android.com/apk/res/android"
2. xmlns:app="http://schemas.android.com/apk/res-auto"
3. xmlns:tools="http://schemas.android.com/tools" >
4. <item
5. android:id="@+id/action_open"
6. android:orderInCategory="100"
7. android:title="打开"
8. app:showAsAction="never"/>
9. <item
10. android:id="@+id/action_new"
11. android:orderInCategory="100"
12. android:title="新建"
13. app:showAsAction="never"/>
14. <item
15. android:id="@+id/action_del"
16. android:orderInCategory="100"
17. android:title="删除"
18. app:showAsAction="never"/>
19. </menu>