常用菜单
菜单 | 显示菜单 | 事件监听 |
---|---|---|
系统菜单 | onCreateOptionsMenu | onOptionsItemSelected |
上下文菜单 | AlertDialog.Builder() | setSingleChoiceItems() |
系统菜单
首先需要在res下面创建一个menu文件夹,并新建一个xml文件作为OptionMenu的布局文件
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="主页" android:id="@+id/one"/>
<item android:title="我的" android:id="@+id/two"/>
<item android:title="博客" android:id="@+id/three"/>
<item android:title="账号" android:id="@+id/four"/>
</menu>
在Activity重写onCreateOptionsMenu加载资源文件
//添加系统菜单
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.items, menu);
return super.onCreateOptionsMenu(menu);
}
在Activity重写onOptionsItemSelected加设置事件监听
//设置item点击事件
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
int itemId = item.getItemId();
switch (itemId) {
case R.id.one:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.two:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.three:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.four:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
}
return super.onOptionsItemSelected(item);
}
上下文菜单
在res下面创建一个menu文件夹,并新建一个xml文件作为ContextMenu的布局文件(同上)
Activity重写onCreateConextMenu加载资源文件
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvShow = (TextView) findViewById(R.id.tv_show);
//长按事件,将上下文菜单注册到tvShow中
registerForContextMenu(tvShow);
}
//添加上下文菜单
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
getMenuInflater().inflate(R.menu.items, menu);
super.onCreateContextMenu(menu, v, menuInfo);
}
Activity重写onConextItemSelected设置事件监听
@Override
public boolean onContextItemSelected(@NonNull MenuItem item) {
int itemId = item.getItemId();
switch (itemId) {
case R.id.one:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.two:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.three:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
case R.id.four:
Toast.makeText(this, "" + item.getTitle(), Toast.LENGTH_SHORT).show();
break;
}
return super.onContextItemSelected(item);
}
*为控件添加长按属性并将菜单绑定到这个控件上:registerForContextMenu(控件)
弹出菜单
实现方法:
步骤1:在res下面创建一个menu文件夹,并新建一个xml文件作为PoupMenu的布局文件。
步骤2:把PopupMenu相关逻辑封装到showPopupMenu()方法中,包含PopupMenu的实例化、布局设置、显示、添加MenuItem的点击监听及响应等
步骤3:为控件设置事件监听直接调用showPopupMenu()方法
XML布局文件:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/red" android:title="红色字体"/>
</menu>
注意:弹出菜单,默认弹出的位置在控件view的下方
public class Main2Activity extends AppCompatActivity {
private TextView tvShow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
tvShow = (TextView) findViewById(R.id.tv_show);
tvShow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showPopMenu();
}
});
}
public void showPopMenu(){
//创建对象
PopupMenu popupMenu = new PopupMenu(this,tvShow);
//记载布局
popupMenu.inflate(R.menu.pop_item);
//事件监听
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
int id=item.getItemId();
switch (id){
case R.id.red:
tvShow.setTextColor(Color.parseColor("#ff0000"));
break;
}
return false;
}
});
//显示菜单
popupMenu.show();
}
}
效果:
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