我的应用程序有问题。首先,我将解释它应该如何工作。当用户单击TextView时,使用ListView的应用程序应将用户从应用程序移动到youtube(例如,观看喜欢的歌曲的音乐视频),问题是用户单击TextView时,什么也没发生,我应该更改我的代码吗?
*现在,我不会按类将传递的链接传递给youtube,因为它应该将数据添加到列表中,现在,我只想一步一步地创建它,我只是创建了带有视频链接的String。
构造类
package com.example.kacper.recyclerview;
public class Constructor {
private String mYoutubeLink;
public Constructor (String youtubeLink){
mYoutubeLink = youtubeLink;
}
public String getYoutubeLink(){return mYoutubeLink;}
}
转接器类别
package com.example.kacper.recyclerview;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.zip.Inflater;
public class Adapter extends ArrayAdapter<Constructor> {
private Context context;
String id = "https://www.youtube.com/watch?v=JGwWNGJdvx8&list=RD87gWaABqGYs&index=4";
public Adapter(Activity context, ArrayList<Constructor> list) {
super(context, 0, list);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View list = convertView;
if (list == null) {
list = LayoutInflater.from(getContext()).inflate(R.layout.activity_list_item, parent, false);
}
TextView textView = (TextView) list.findViewById(R.id.TextView123);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube://" + id));
context.startActivity(intent);
}
});
return list;
}
}
该类将包含数据并将其添加到某天的列表中..:D
package com.example.kacper.recyclerview;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;
import java.util.ArrayList;
public class empty extends AppCompatActivity {
String string;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
ArrayList<Constructor> list = new ArrayList<Constructor>();
list.add(new Constructor("dummy data"));
Adapter adapter = new Adapter(this, list);
ListView listView = (ListView) findViewById(R.id.list);
listView.setAdapter(adapter);
}
}
activity_list_item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/TextView123"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="click"
android:textSize="15sp"/>
</LinearLayout>
activity_list_view
<?xml version="1.0" encoding="utf-8"?>
<ListView
android:id="@+id/list"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
最佳答案
查看您的代码,看来您的Adapter构造器需要更改为
public Adapter(Activity context, ArrayList<Constructor> list) {
super(context, 0, list);
this.context = context;
}
在下面的代码中上下文为null,因此给出
NullPointerException
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube://" + id));
context.startActivity(intent);
您还应该坚持Android Coding style guidelines
关于java - ListView-无法在TextView上转换 Intent ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51545071/