安卓menu的介绍与使用

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/add"
android:icon="@mipmap/addition"
android:title="添加"/>
<item android:id="@+id/see"
android:icon="@mipmap/eye"
android:title="发现"/>
<item android:id="@+id/state"
android:icon="@mipmap/emoji"
android:title="表情"/>
</menu>

public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
} @Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.option_menu,menu);
return true;
}
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/top"
android:icon="@mipmap/up"
android:title="置顶" />
<item
android:id="@+id/delete"
android:icon="@mipmap/delete"
android:title="删除" />
</menu>

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.listview);
Random random = new Random();
for (int i=0;i<array.length;i++){
array[i] =String.valueOf(random.nextInt(1000));
}
//就因为这行代码，使按钮的长按事件与onCreateContextMenu建立了联系，所以非常重要
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,array);
listView.setAdapter(adapter); listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
listView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
Log.d(TAG,"onCreateActionMode");
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.float_menu,menu);
return true;
} @Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
Log.d(TAG,"onPrepareActionMode");
return false;
} @Override
public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
//长按控件调用的第一个方法。
Log.d(TAG,"onItemCheckedStateChanged");
} @Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
Log.d(TAG,"onActionItemClicked");
switch (item.getItemId()){
case R.id.top:
Toast.makeText(MainActivity.this, "置顶", Toast.LENGTH_SHORT).show();
mode.finish();
return true;
default:
return false;
}
} @Override
public void onDestroyActionMode(ActionMode mode) {
Log.d(TAG,"onDestroyActionMode");
}
});
}

public class MainActivity extends AppCompatActivity implements PopupMenu.OnMenuItemClickListener{
private static final String TAG = "MainActivity";
private Button showPopMenuBtn; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showPopMenuBtn = findViewById(R.id.showPopmenuBtn);
showPopMenuBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PopupMenu popup = new PopupMenu(MainActivity.this,v);
MenuInflater inflater = popup.getMenuInflater();
inflater.inflate(R.menu.option_menu,popup.getMenu());
setIconEnable(popup.getMenu(),true);
popup.show();//这里给popup设置监听事件,而整个activity实现了监听。
popup.setOnMenuItemClickListener(MainActivity.this);
}
});
} public void setIconEnable(Menu menu, boolean isVisible){
if (menu !=null){
try {
Method method = menu.getClass().getDeclaredMethod("setOptionalIconsVisible",boolean.class);
method.setAccessible(true);
method.invoke(menu,isVisible);
} catch (Exception e) {
e.printStackTrace();
}
}
} @Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()){
case R.id.add:
Toast.makeText(MainActivity.this,"添加",Toast.LENGTH_SHORT).show();
return true;
default:
return false; }
}