如何打开上recyclerView项不同的活动的onclick [英] How to open a different activity on recyclerView item onclick
问题描述
我使用的是 recyclerView
来显示我的时listItems
在抽屉式导航
。我已经实现了 onclickListener
,但我一直停留在如何打开一个不同的活动
时, 项的点击
。我的所有项目做项目点击截至目前为每code是显示面包
与项目位置
。
我会AP preciate的帮助。
AdapterClass.java
公共类AdapterClass扩展RecyclerView.Adapter< AdapterClass.MyViewHolder> {
私人LayoutInflater充气;
私人上下文的背景下;
列表与LT;信息>数据= Collections.emptyList();
公共AdapterClass(上下文的背景下,列表与LT;信息>数据){
this.context =背景;
充气= LayoutInflater.from(上下文);
this.data =数据;
}
@覆盖
公共MyViewHolder onCreateViewHolder(ViewGroup中的父母,INT viewType){
查看查看= inflater.inflate(R.layout.custom_row,父母,假);
MyViewHolder持有人=新MyViewHolder(视图);
回报持有人;
}
@覆盖
公共无效onBindViewHolder(MyViewHolder持有人,INT位置){
信息电流= data.get(位置);
holder.title.setText(current.title);
holder.icon.setImageResource(current.iconId);
}
@覆盖
公众诠释getItemCount(){
返回data.size();
}
类MyViewHolder扩展RecyclerView.ViewHolder实现View.OnClickListener {
TextView的称号;
ImageView的图标;
公共MyViewHolder(查看ItemView控件){
超(ItemView控件);
标题=(TextView中)itemView.findViewById(R.id.listText);
图标=(ImageView的)itemView.findViewById(R.id.listIcon);
itemView.setClickable(真正的);
itemView.setOnClickListener(本);
}
@覆盖
公共无效的onClick(视图v){
Toast.makeText(背景下,单击的项目是:+为getPosition(),Toast.LENGTH_SHORT).show();
}
};
}
实施康拉德的解决方案后,登录猫错误
02-27 15:24:52.833:D / AndroidRuntime(1630):---------开始崩溃
02-27 15:24:52.834:E / AndroidRuntime(1630):致命异常:主要
02-27 15:24:52.834:E / AndroidRuntime(1630):工艺:com.snappy.stevekamau.snappy,PID:1630
02-27 15:24:52.834:E / AndroidRuntime(1630):java.lang.RuntimeException的:无法启动的活动ComponentInfo {com.snappy.stevekamau.snappy / com.snappy.stevekamau.snappy.YourActivity}:java.lang中.NullPointerException:尝试在空对象引用调用虚拟方法java.lang.CharSequence中android.support.v7.widget.Toolbar.getTitle()
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.ActivityThread.access $ 800(ActivityThread.java:144)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1278)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.os.Handler.dispatchMessage(Handler.java:102)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.os.Looper.loop(Looper.java:135)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.ActivityThread.main(ActivityThread.java:5221)
02-27 15:24:52.834:E / AndroidRuntime(1630):在java.lang.reflect.Method.invoke(本机方法)
02-27 15:24:52.834:E / AndroidRuntime(1630):在java.lang.reflect.Method.invoke(Method.java:372)
02-27 15:24:52.834:E / AndroidRuntime(1630):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:899)
02-27 15:24:52.834:E / AndroidRuntime(1630):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-27 15:24:52.834:E / AndroidRuntime(1630):显示java.lang.NullPointerException:产生的原因试图调用虚拟方法java.lang.CharSequence中android.support.v7.widget.Toolbar.getTitle()在一个空对象引用
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.support.v7.internal.widget.ToolbarWidgetWrapper< INIT>(ToolbarWidgetWrapper.java:95)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.support.v7.internal.widget.ToolbarWidgetWrapper< INIT>(ToolbarWidgetWrapper.java:88)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.support.v7.internal.app.ToolbarActionBar< INIT>(ToolbarActionBar.java:84)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.support.v7.app.ActionBarActivityDelegateBase.setSupportActionBar(ActionBarActivityDelegateBase.java:175)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.support.v7.app.ActionBarActivity.setSupportActionBar(ActionBarActivity.java:92)
02-27 15:24:52.834:E / AndroidRuntime(1630):在com.snappy.stevekamau.snappy.YourActivity.onCreate(YourActivity.java:18)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.Activity.performCreate(Activity.java:5933)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
02-27 15:24:52.834:E / AndroidRuntime(1630):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
02-27 15:24:52.834:E / AndroidRuntime(1630):10 ...更多
02-27 15:24:52.839:W / ActivityManager(464):强制完成活动com.snappy.stevekamau.snappy / .YourActivity
02-27 15:24:52.841:W / ActivityManager(464):强制完成活动com.snappy.stevekamau.snappy / .MainActivity
我觉得很容易。你可以(但你不必因为ViewHolder类不是静态的)创建领域上下文如下:
私人最终上下文的背景下;
公共MyViewHolder(查看ItemView控件){
超(ItemView控件);
上下文= itemView.getContext();
...
}
和您的onClick方法只需要调用某事象下面这样:
@覆盖
公共无效的onClick(视图v){
最终意图的意图;
开关(getPostion()){
情况下0:
意图=新的意图(背景下,FirstActivity.class);
打破;
情况1:
意图=新的意图(背景下,SecondActivity.class);
打破;
...
默认:
意图=新的意图(背景下,DefaultActivity.class);
打破;
}
context.startActivity(意向);
}
或
@覆盖
公共无效的onClick(视图v){
最终意图的意图;
如果(为getPosition()==某物){
意图=新的意图(背景下,OneActivity.class);
}否则,如果(为getPosition()== STH2){
意图=新的意图(背景下,SecondActivity.class);
} 其他 {
意图=新的意图(背景下,DifferentActivity.class);
}
context.startActivity(意向);
}
i am using a recyclerView
to show my listitems
in the navigation drawer
.I have implemented the onclickListener
but i have been stuck on how to open a different activity
when items are clicked
. All my items do on item click as of now as per the code is to display a toast
with the item position
.
I would appreciate the help.
AdapterClass.java
public class AdapterClass extends RecyclerView.Adapter<AdapterClass.MyViewHolder> {
private LayoutInflater inflater;
private Context context;
List<Information>data= Collections.emptyList();
public AdapterClass(Context context,List<Information>data){
this.context=context;
inflater= LayoutInflater.from(context);
this.data=data;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= inflater.inflate(R.layout.custom_row,parent,false);
MyViewHolder holder=new MyViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Information current=data.get(position);
holder.title.setText(current.title);
holder.icon.setImageResource(current.iconId);
}
@Override
public int getItemCount() {
return data.size();
}
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView title;
ImageView icon;
public MyViewHolder(View itemView) {
super(itemView);
title=(TextView)itemView.findViewById(R.id.listText);
icon=(ImageView)itemView.findViewById(R.id.listIcon);
itemView.setClickable(true);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Toast.makeText(context,"The Item Clicked is: "+getPosition(),Toast.LENGTH_SHORT).show();
}
};
}
Log cat error after implementing Konrad's solution
02-27 15:24:52.833: D/AndroidRuntime(1630): --------- beginning of crash
02-27 15:24:52.834: E/AndroidRuntime(1630): FATAL EXCEPTION: main
02-27 15:24:52.834: E/AndroidRuntime(1630): Process: com.snappy.stevekamau.snappy, PID: 1630
02-27 15:24:52.834: E/AndroidRuntime(1630): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.snappy.stevekamau.snappy/com.snappy.stevekamau.snappy.YourActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.ActivityThread.access$800(ActivityThread.java:144)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.os.Handler.dispatchMessage(Handler.java:102)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.os.Looper.loop(Looper.java:135)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.ActivityThread.main(ActivityThread.java:5221)
02-27 15:24:52.834: E/AndroidRuntime(1630): at java.lang.reflect.Method.invoke(Native Method)
02-27 15:24:52.834: E/AndroidRuntime(1630): at java.lang.reflect.Method.invoke(Method.java:372)
02-27 15:24:52.834: E/AndroidRuntime(1630): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
02-27 15:24:52.834: E/AndroidRuntime(1630): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-27 15:24:52.834: E/AndroidRuntime(1630): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.support.v7.internal.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:95)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.support.v7.internal.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:88)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.support.v7.internal.app.ToolbarActionBar.<init>(ToolbarActionBar.java:84)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.support.v7.app.ActionBarActivityDelegateBase.setSupportActionBar(ActionBarActivityDelegateBase.java:175)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.support.v7.app.ActionBarActivity.setSupportActionBar(ActionBarActivity.java:92)
02-27 15:24:52.834: E/AndroidRuntime(1630): at com.snappy.stevekamau.snappy.YourActivity.onCreate(YourActivity.java:18)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.Activity.performCreate(Activity.java:5933)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
02-27 15:24:52.834: E/AndroidRuntime(1630): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
02-27 15:24:52.834: E/AndroidRuntime(1630): ... 10 more
02-27 15:24:52.839: W/ActivityManager(464): Force finishing activity com.snappy.stevekamau.snappy/.YourActivity
02-27 15:24:52.841: W/ActivityManager(464): Force finishing activity com.snappy.stevekamau.snappy/.MainActivity
I think that it is easy. You can (but you don't have to because ViewHolder class is not static) create field context as is shown below:
private final Context context;
public MyViewHolder(View itemView) {
super(itemView);
context = itemView.getContext();
...
}
and on your onClick method just call sth like below:
@Override
public void onClick(View v) {
final Intent intent;
switch (getPostion()){
case 0:
intent = new Intent(context, FirstActivity.class);
break;
case 1:
intent = new Intent(context, SecondActivity.class);
break;
...
default:
intent = new Intent(context, DefaultActivity.class);
break;
}
context.startActivity(intent);
}
or
@Override
public void onClick(View v) {
final Intent intent;
if (getPosition() == sth){
intent = new Intent(context, OneActivity.class);
} else if (getPosition() == sth2){
intent = new Intent(context, SecondActivity.class);
} else {
intent = new Intent(context, DifferentActivity.class);
}
context.startActivity(intent);
}
这篇关于如何打开上recyclerView项不同的活动的onclick的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!