android项目--上下文菜单

一般说到上下文菜单基本上都是长按事件，在一个控件上长按，就会弹出一个菜单。



1.创建上下文菜单：

//覆盖方法，创建上下文菜单
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
//创建菜单项

　　  menu.add(0, 0, 0, "查看");
menu.add(0, 1, 0, "跳转至网页查看");
menu.add(0, 2, 0, "查看博主其他博文");

menu.add(0, 0, 0, "删除此项");
menu.add(0, 1, 0, "全部删除");
menu.add(0, 2, 0, "返回");

}

2.覆盖方法onContextItemSelected。对每一个菜单项进行相应的处理

// 覆盖方法，对每一个菜单项进行事件监听
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 0:
Toast.makeText(context, "查看", Toast.LENGTH_SHORT).show();
break;
case 1:
Toast.makeText(context, "跳转至网页查看", Toast.LENGTH_SHORT).show();
break;
case 2:
// 。。。。。。。。
break;
default:
break;
}
return super.onContextItemSelected(item);
}

3.注册上下文菜单。如果没有注册，单击界面的某一个视图是没有反应的，所以上下文菜单与前面的选项菜单不一样

registerForContextMenu(linearLayout);   //注册上下文菜单

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在此，我想说的是另一种方法：通过对话框设置短按的上下文菜单

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AlertDialog.Builder dalog = new AlertDialog.Builder(OfflineBlogsContentActivity.this);
dalog.setTitle("请选择您要的操作：");
dalog.setView(null);
dalog.setItems(new String[] { "跳转至网页查看", "查看博主其他博文", "删除此记录", "取消"},
new OnClickListener() {

@Override
public void onClick(DialogInterface dialog1, int which) {
switch (which) {
case 0://跳转至网页查看
Intent intent = new Intent(OfflineBlogsContentActivity.this,
BlogsContentActivity.class);
intent.setAction("showbloger");
intent.putExtra("id", blog_offine.getBlogId());
intent.putExtra("newstitle", blog_offine.getBlogTitle());
intent.putExtra("link", blog_offine.getBlogUrl());
intent.putExtra("summary", blog_offine.getBlogSummary());
intent.putExtra("updated", blog_offine.getUpdateTime());
intent.putExtra("comments", blog_offine.getBlogSummary());
intent.putExtra("name", blog_offine.getBloger());
if (CheckNetWork.checkNetworkInfo(OfflineBlogsContentActivity.this)) {
startActivity(intent);
}

break;

case 1://查看博主其他博文
if (CheckNetWork.checkNetworkInfo(OfflineBlogsContentActivity.this)) {
System.out.println(blogapp);
Intent intent1 = new Intent(OfflineBlogsContentActivity.this,BlogerAllBlogsActivity.class);
intent1.putExtra("blogapp", blogapp);
intent1.putExtra("avatar", blogerimgUrl);
intent1.putExtra("name", blogername);
intent1.putExtra("postcount", blogernum);
startActivity(intent1);
}else{
Toast.makeText(OfflineBlogsContentActivity.this, "当前无网络！", Toast.LENGTH_SHORT).show();
}
break;
case 2://删除此记录
AlertDialog.Builder alert = new AlertDialog.Builder(
OfflineBlogsContentActivity.this);
alert.setView(null);
alert.setTitle("删除此项");
alert.setMessage("警告：将删除" + itemName);
alert.setPositiveButton("确定",
new OnClickListener() {

@Override
public void onClick(
DialogInterface dialog,
int which) {
BlogsSQLHelper
.getDBInstance(
OfflineBlogsContentActivity.this)
.deleteItem(
blog_offine
.getBlogId());
}
});
alert.setNegativeButton("取消", null);
alert.create().show();
break;
case 3://取消
dialog1.dismiss();
break;
}
}
});
dalog.create().show();