我正在使用this教程实现带有RecyclerView的导航抽屉，但我不想应用整个教程，我只想处理用户的点击。我已在onClickListener课程的ViewHolder内实施了MyAdapter：
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener{
int Holderid; ImageView imageView, profile;
TextView textView, Name, email, drawerTitle;
private ClickListener listener;
// ViewHolder Constructor with View and viewType as a parameter
public ViewHolder(View itemView, int ViewType, ClickListener listener) {
super(itemView);
if (ViewType == TYPE_HEADER){
itemView.setClickable(false);
Name = (TextView) itemView.findViewById(R.id.user_name);
email = (TextView) itemView.findViewById(R.id.user_email);
profile = (ImageView) itemView.findViewById(R.id.circleView);
Holderid = 0;
}
if(ViewType == TYPE_ITEM) {
itemView.setClickable(true);
textView = (TextView) itemView.findViewById(R.id.rowText);
imageView = (ImageView) itemView.findViewById(R.id.rowIcon);
Holderid = 1;
// Handle item click and set the selection
}
if(ViewType == TYPE_SEPARATOR){
itemView.setClickable(false);
drawerTitle = (TextView) itemView.findViewById(R.id.drawerTitle);
Holderid = 2;
}
this.listener = listener;
itemView.setOnClickListener(this);
itemView.setOnLongClickListener(this);
}
int pos;
@Override
public void onClick(View v) {
if (listener != null) {
listener.onItemClicked(getPosition());
pos= getPosition();
Log.d("TAG", "Item clicked at position " + getPosition());
}
}
@Override
public boolean onLongClick(View v) {
if (listener != null) {
return listener.onItemLongClicked(getPosition());
}
return false;
}
public interface ClickListener {
public void onItemClicked(int position);
public boolean onItemLongClicked(int position);
}
}
我无法理解的是如何将ClickListener应用于MyAdapter对象：
mAdapter = new MyAdapter(dataList, mSelectedPositions, ...?);
这样当用户点击一个项目时，我就可以在MainActivity处理用户的点击。
我已经以这种方式创建了适配器（如教程中所述）：
整个MyAdapter课程：http://pastie.org/private/cibcsj3zieorlkcgh2rm1g
这是我的MainActivity类'onCreate：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* Assigning the toolbar object ot the view
and setting the the Action bar to our toolbar */
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
// enable ActionBar app icon to behave as action to toggle nav drawer
getSupportActionBar().setDisplayHomeAsUpEnabled(true); //pulsante drawer
getSupportActionBar().setHomeButtonEnabled(true); //pulsante dietro
//Initializing
mTitle = mDrawerTitle = getTitle();
SharedPreferences usrData = getSharedPreferences(
usr_loggedin,
MODE_PRIVATE);
AVATARresID = R.mipmap.aka;
// Add Drawer Item to dataList
dataList = new ArrayList<>();
dataList = prepareDatalist(dataList, NAME, EMAIL, AVATARresID);
mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
mRecyclerView.setHasFixedSize(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mAdapter = new MyAdapter(dataList, mSelectedPositions); //**ERROR HERE**
mRecyclerView.setAdapter(mAdapter);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
// Drawer Listener set to the Drawer toggle
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState(); // Finally we set the drawer toggle sync State
}
如何将onClick课程中出现的MyAdapter的结果提取回MainActivity，
int pos;
@Override
public void onClick(View v) {
if (listener != null) {
listener.onItemClicked(getPosition());
pos= getPosition();
Log.d("TAG", "Item clicked at position " + getPosition());
}
}
这样我可以根据点击的项目位置处理操作吗？
答案 0 :(得分：1)
ClickListener的构造函数也是实现Activity的类的对象。例如，您可以让Fragment / this实现该接口并使用public class MainActivity extends Activity implements ViewHolder.ClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// ....
mAdapter = new MyAdapter(dataList, mSelectedPositions, this);
// ....
}
作为参数
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.fgps"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="22" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="my api key is here" />
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
</activity>
<activity android:name="AlarmReceiverActivity" android:label="@string/alarmReceiverActivity_string"></activity><activity
android:name=".MnaActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name="com.example.fgps.BackgroundLocationService" />
</application>
</manifest>