ContextMenu上下文菜单 PopupMenu弹出式菜单 小例子

 

 

 

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res/menu中代码：

 

popup_menu.xml

 

<item android:id="@+id/color_red"       android:title="红色"       android:orderInCategory="10"       android:icon="@android:drawable/ic_dialog_info"       />   <item android:id="@+id/color_yellow"       android:title="黄色"       android:orderInCategory="20"       android:icon="@android:drawable/ic_dialog_info"       />   <item android:id="@+id/color_green"       android:title="绿色"       android:orderInCategory="10"       android:icon="@android:drawable/ic_dialog_info"       /></menu>

 

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activity类代码

 

 

public class Main2Activity extendsAppCompatActivity {    private TextView textView;   @Override   protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main2);       textView = (TextView) findViewById(R.id.textView);       registerForContextMenu(textView);//把上下文菜单注册到某一个组件上，那么在长按该组件会弹出上下文菜单    }    @Override   public void onCreateContextMenu(ContextMenu menu, View v,ContextMenu.ContextMenuInfo menuInfo) {       super.onCreateContextMenu(menu, v, menuInfo);       System.out.println(menu);       System.out.println(v);       System.out.println(menuInfo);       getMenuInflater().inflate(R.menu.context_menu,menu);    }    @Override   public boolean onContextItemSelected(MenuItem item) {//       item.getTitle();        System.out.println(item.getMenuInfo());       AdapterView.AdapterContextMenuInfo info=(AdapterView.AdapterContextMenuInfo) item.getMenuInfo();       System.out.println(info.targetView);       switch (item.getItemId()){           case R.id.color_red:               textView.setBackgroundColor(Color.RED);                break;           case R.id.color_green:               textView.setBackgroundColor(Color.GREEN);                break;           case R.id.color_yellow:                textView.setBackgroundColor(Color.YELLOW);                break;       }       return super.onContextItemSelected(item);    }}

public class Main4Activity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main4);    }    public void showPopupMenuClick(View view){        //创建弹出式菜单(context,要把菜单显示在哪个组件的旁边)        PopupMenu popupMenu = new PopupMenu(this,view);        popupMenu.getMenuInflater().inflate(R.menu.popup_menu,popupMenu.getMenu());        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {            @Override            public boolean onMenuItemClick(MenuItem item) {                switch (item.getItemId()){                    case R.id.color_red:                        Toast.makeText(Main4Activity.this, "red", Toast.LENGTH_SHORT).show();                        break;                    case R.id.color_green:                        Toast.makeText(Main4Activity.this, "green", Toast.LENGTH_SHORT).show();                        break;                    case R.id.color_yellow:                        Toast.makeText(Main4Activity.this, "yellow", Toast.LENGTH_SHORT).show();                        break;                }                return true;            }        });        popupMenu.show();    }}