Android的无法解析构造意图 [英] Android cannot resolve constructor intent

问题描述

下面是我的code的一部分。我试图在其中当你点击第一个列表项它将启动活动 MrsClubb 导航菜单。然而，当我把这个在我的code将其与错误出现：

 无法解析构造意愿（android.widget.AdapterView.OnItemClickListener，java.lang.Class中＆LT; COM ....等＆GT;）
 

任何想法如何解决这个问题？

双**显示了在code中的误差。

下面是code的部分：

  @覆盖
保护无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;
    工具条工具栏=（栏）findViewById（R.id.toolbar）;
    mDrawerLayout =（DrawerLayout）findViewById（R.id.drawer）;
    mDrawerList =（ListView控件）findViewById（android.R.id.list）;
    mDrawerListItems = getResources（）getStringArray（R.array.drawer_list）。
    mDrawerList.setAdapter（新ArrayAdapter＆LT;串GT;（这一点，android.R.layout.simple_list_item_1，mDrawerListItems））;
    mDrawerList.setOnItemClickListener（新AdapterView.OnItemClickListener（）{
        @覆盖
        公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
            开关（位置）{
                情况下0：
                    意图I =新意图**（这一点，MrsClubb.class）**
                    startActivity（ⅰ）;
            }
            mDrawerLayout.closeDrawer（mDrawerList）;        }
    }）;
    mDrawerToggle =新ActionBarDrawerToggle（这一点，
            mDrawerLayout，
            工具栏，
            R.string.drawer_open，
            R.string.drawer_close）{
        公共无效onDrawerClosed（视图v）{
            （五）super.onDrawerClosed;
            invalidateOptionsMenu（）;
            syncState（）;
        }
        公共无效onDrawerOpened（视图v）{
            （五）super.onDrawerOpened;
            invalidateOptionsMenu（）;
            syncState（）;
        }
    };
 

解决方案

问题：

您不能使用这个来指活动的内部类中，如这个变得对内部类的引用。在构造函数的含义不解决消息是编译器间$ P $点为

 意图（AdapterView.OnItemClickListener监听器，Class类）
 

，它不识别，而不是

 意图（上下文的背景下，Class类）
 

这是正确的，而编译器所期待的。

解决方案：

替换

 意向书I =新意图（这一点，MrsClubb.class）;
 

与

 意向书I =新意图（MyActivity.this，MrsClubb.class）;
 

其中， MyActivity 是本code所属的活动类的名称。

Here is a section of my code. I am trying to make a navigation menu in which when you click on the first list item it launches the activity MrsClubb. However when I put this into my code it comes up with the error:

Cannot resolve constructor 'Intent(android.widget.AdapterView.OnItemClickListener,java.lang.Class<com....etc>)'

Any ideas how to resolve this?

The double ** shows where in the code the error is.

Here is the section of the code:

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
    mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer);
    mDrawerList = (ListView)findViewById(android.R.id.list);
    mDrawerListItems = getResources().getStringArray(R.array.drawer_list);
    mDrawerList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mDrawerListItems));
    mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            switch(position) {
                case 0:
                    Intent i = new Intent**(this, MrsClubb.class);**
                    startActivity(i);
            }
            mDrawerLayout.closeDrawer(mDrawerList);

        }
    });
    mDrawerToggle = new ActionBarDrawerToggle(this,
            mDrawerLayout,
            toolbar,
            R.string.drawer_open,
            R.string.drawer_close){
        public void onDrawerClosed(View v){
            super.onDrawerClosed(v);
            invalidateOptionsMenu();
            syncState();
        }
        public void onDrawerOpened(View v){
            super.onDrawerOpened(v);
            invalidateOptionsMenu();
            syncState();
        }
    };

解决方案

The Problem:

You cannot use this to refer to the Activity inside an inner class, as this becomes a reference to the inner class. The meaning of the constructor not resolved message is that the compiler interprets it as

Intent(AdapterView.OnItemClickListener listener, Class class) 

which it does not recognize, instead of

Intent(Context context, Class class)

which is correct and what the compiler expects.

The Solution:

Replace

Intent i = new Intent(this, MrsClubb.class);

with

Intent i = new Intent(MyActivity.this, MrsClubb.class);

where MyActivity is the name of the Activity class in which this code belongs.

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