1. Menu 菜单
1.系统菜单
2.上下文菜单
3.弹出菜单
1.系统菜单
代码如下:
首先在res中创建一个文件夹 内含有xml的 命名OptionMenu的布局文件
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<!--showAsAction属性:always总是 never 从不 ifroom 能显示就显示 默认是nerver-->
<item android:id="@+id/blue" android:title="蓝色" app:showAsAction="never" ></item>
<item android:id="@+id/red" android:title="红色" > </item>
<item android:id="@+id/green" android:title="绿色" ></item>
</menu>
public class MainActivity extends AppCompatActivity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=findViewById(R.id.a);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.optionmenu,menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id=item.getItemId();
switch (id){
case R.id.blue:
textView.setTextColor(Color.BLUE);
break;
case R.id.red:
textView.setTextColor(Color.RED);
break;
case R.id.green:
textView.setTextColor(Color.GREEN);
break;
}
return super.onOptionsItemSelected(item);
}
}
2.上下文菜单
代码如下:
首先在res中创建一个文件夹 内含有xml的 命名ContextMenu的布局文件
然后和上一个菜单的xml中代码一样
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<!--showAsAction属性:always总是 never 从不 ifroom 能显示就显示 默认是nerver-->
<item android:id="@+id/blue" android:title="蓝色" app:showAsAction="never" ></item>
<item android:id="@+id/red" android:title="红色" > </item>
<item android:id="@+id/green" android:title="绿色" ></item>
</menu>
public class Main2Activity extends AppCompatActivity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
textView=findViewById(R.id.aa);
registerForContextMenu(textView);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
getMenuInflater().inflate(R.menu.contextmenu,menu);
super.onCreateContextMenu(menu, v, menuInfo);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
int id=item.getItemId();
switch (id){
case R.id.blue1:
textView.setTextColor(Color.BLUE);
break;
case R.id.red2:
textView.setTextColor(Color.RED);
break;
case R.id.green3:
textView.setTextColor(Color.GREEN);
break;
}
return super.onContextItemSelected(item);
}
}
3.弹出菜单
代码如下 :
首先在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。(代码同上)
可以封装在方法中 也可以不封装 下面是封装方法的代码
public class Main3Activity extends AppCompatActivity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
textView=findViewById(R.id.poup);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showpoupmenu();
}
private void showpoupmenu() {
PopupMenu popupMenu = new PopupMenu(Main3Activity.this, textView);
popupMenu.inflate(R.menu.poupmenu);
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
int id=item.getItemId();
switch (id){
case R.id.blue4:
textView.setTextColor(Color.BLUE);
break;
case R.id.red4:
textView.setTextColor(Color.RED);
break;
case R.id.green4:
textView.setTextColor(Color.GREEN);
break;
}
return false;
}
});
popupMenu.show();
}
});
}
}