Android_几种菜单

Android中的菜单有如下几种：

OptionMenu：选项菜单，android中最常见的菜单，通过Menu键来调用

SubMenu：子菜单，android中点击子菜单将弹出一个显示子菜单项的悬浮框，子菜单不支持嵌套，即不能包括其他子菜单

ContextMenu：上下文菜单，通过长按某个视图组件后出现的菜单，该组件需注册上下文菜单

OptionMenu：

public boolean onCreateOptionsMenu(Menu menu)：调用OptionMenu，在这里完成菜单初始化

public boolean onOptionsItemSelected(MenuItem item)：菜单项被选中时触发，这里完成事件处理

public void onOptionsMenuClosed(Menu menu)：菜单关闭会调用该方法

public boolean onPrepareOptionsMenu(Menu menu)：选项菜单显示前会调用该方法，可在这里进行菜单的调整(动态加载菜单列表)

public boolean onMenuOpened(int featureId, Menu menu)：选项菜单打开以后会调用这个方法

加载菜单的方式有两种，一种是直接通过编写菜单XML文件，然后调用： getMenuInflater().inflate(R.menu.menu_main, menu);加载菜单

或者通过代码动态添加，onCreateOptionsMenu的参数menu，调用add方法添加菜单，add(菜单项的组号，ID，排序号，标题)，另外如果排序号是按添加顺序排序的话都填0即可

public class MainActivity extends AppCompatActivity {

//1.定义不同颜色的菜单项的标识:

final private int RED = 110;

final private int GREEN = 111;

final private int BLUE = 112;

final private int YELLOW = 113;

final private int GRAY= 114;

final private int CYAN= 115;

final private int BLACK= 116;

private TextView tv_test;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv_test = (TextView) findViewById(R.id.tv_test);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

menu.add(1,RED,4,"红色");

menu.add(1,GREEN,2,"绿色");

menu.add(1,BLUE,3,"蓝色");

menu.add(1,YELLOW,1,"黄色");

menu.add(1,GRAY,5,"灰色");

menu.add(1,CYAN,6,"蓝绿色");

menu.add(1,BLACK,7,"黑色");

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

switch (id){

case RED:

tv_test.setTextColor(Color.RED);

break;

case GREEN:

tv_test.setTextColor(Color.GREEN);

break;

case BLUE:

tv_test.setTextColor(Color.BLUE);

break;

case YELLOW:

tv_test.setTextColor(Color.YELLOW);

break;

case GRAY:

tv_test.setTextColor(Color.GRAY);

break;

case CYAN:

tv_test.setTextColor(Color.CYAN);

break;

case BLACK:

tv_test.setTextColor(Color.BLACK);

break;

}

return super.onOptionsItemSelected(item);

}}

ContextMenu

重写onCreateContextMenu()方法、为view组件注册上下文菜单，使用registerForContextMenu()方法,参数是View、重写onContextItemSelected()方法为菜单项指定事件监听器

menu_context.xml：

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android">

</group></menu>

接着我们在选项菜单的那个基础上，添加一个TextView，然后加上下面一些东西：

private TextView tv_context;

tv_context = (TextView) findViewById(R.id.tv_context);

registerForContextMenu(tv_context);

//重写与ContextMenu相关方法

@Override

//重写上下文菜单的创建方法

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenu.ContextMenuInfo menuInfo) {

MenuInflater inflator = new MenuInflater(this);

inflator.inflate(R.menu.menu_context, menu);

super.onCreateContextMenu(menu, v, menuInfo);

}

//上下文菜单被点击是触发该方法

@Override

public boolean onContextItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.blue:

tv_context.setTextColor(Color.BLUE);

break;

case R.id.green:

tv_context.setTextColor(Color.GREEN);

break;

case R.id.red:

tv_context.setTextColor(Color.RED);

break;

}

return true;

}

SubMenu(子菜单)

所谓的子菜单只是在<**item**>中又嵌套了一层<**menu**>而已

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android">

<menu>

</group>

</menu>

</item></menu>

接着我们改下上面上下文菜单的两个方法的内容，换上下面的代码：

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenu.ContextMenuInfo menuInfo) {

//子菜单部分：

MenuInflater inflator = new MenuInflater(this);

inflator.inflate(R.menu.menu_sub, menu);

super.onCreateContextMenu(menu, v, menuInfo);}

public boolean onContextItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.one:

Toast.makeText(MainActivity.this,"你点击了子菜单一",Toast.LENGTH_SHORT).show();

break;

case R.id.two:

item.setCheckable(true);

Toast.makeText(MainActivity.this,"你点击了子菜单二",Toast.LENGTH_SHORT).show();

break;

case R.id.three:

Toast.makeText(MainActivity.this,"你点击了子菜单三",Toast.LENGTH_SHORT).show();

item.setCheckable(true);

break;

}

return true;}

Popupmenu见https://www.cnblogs.com/XiaoGao128/p/12240792.html

参考资料：菜鸟教程