Question

如何在列表视图中单击ImageButton时打开新活动？目前我的OnClickListener在我的ArrayAdapter类中，但从那里我无法开始新的活动。那么我怎样才能在MainActivity中获得OnClickListener以及如何在那里处理＆＃34; name＆＃34;和＆＃34; ID＆＃34;？

继承我的ArrayAdapter：

public class MessageArrayAdapter extends ArrayAdapter<MessageHome> {

private TextView playername;
private ImageView profile;
private ImageButton chat;
private List<MessageHome> MessageList = new ArrayList<MessageHome>();
private LinearLayout singleMessageContainer;

@Override
public void add(MessageHome object) {
    MessageList.add(object);
    super.add(object);
}

public MessageArrayAdapter(Context context, int textViewResourceId) {
    super(context, textViewResourceId);
}


public int getCount() {
    return this.MessageList.size();
}

public MessageHome getItem(int index) {
    return this.MessageList.get(index);
}

public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    if (row == null) {
        LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(R.layout.activity_chat_singlemessage, parent, false);
    }
    singleMessageContainer = (LinearLayout) row.findViewById(R.id.singleMessageContainer);
    MessageHome chatMessageObj = getItem(position);
    playername = (TextView) row.findViewById(R.id.playername_);
    playername.setText(chatMessageObj.name);
    final String ID = chatMessageObj.ID;
    final String name = chatMessageObj.name;
    profile = (ImageView) row.findViewById(R.id.imageView2);
    if(chatMessageObj.newm == 1)
        profile.setImageResource(R.drawable.player);
    else
        profile.setImageResource(R.drawable.player2);

    chat = (ImageButton) row.findViewById(R.id.ib_message);
    chat.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.e("log_tag",name+ID);
            // Here start new activity, but doesn't work here

        }
    });

    return row;
}

}

这是我的MainActivity：

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Intent i = getIntent();
    setContentView(R.layout.activity_message);

    listView = (ListView) findViewById(R.id.listView1);

    messageArrayAdapter = new MessageArrayAdapter(getApplicationContext(), R.layout.activity_message_single);
    listView.setAdapter(messageArrayAdapter);

    listView.setTranscriptMode(AbsListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
    listView.setAdapter(messageArrayAdapter);

    //to scroll the list view to bottom on data change
    messageArrayAdapter.registerDataSetObserver(new DataSetObserver() {
        @Override
        public void onChanged() {
            super.onChanged();
            listView.setSelection(messageArrayAdapter.getCount() - 1);
        }
    });
}

感谢您的帮助;）

Answer 1

所有Views都有Context：

chat.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Log.e("log_tag",name+ID);
        Intent intent = new Intent(v.getContext(), NextActivity.class);
        v.getContext().startActivity(intent);
    }
});

Answer 2

尝试将以下行放在您的activity_chat_singlemessage.xml

中

android:onClick="nameOfFunction"

并将此功能放入您的活动中

 public void nameOfFunction(final View view){
      startActivity(new Intent(this, YourNewActivity.class));
 }

Answer 3

适配器中的

：

Uncaught ReferenceError: $ is not defined

并在你的听众中：

private Context context;
public MessageArrayAdapter(Context context, int textViewResourceId) {
    super(context, textViewResourceId);
  this.context = context;
}

Answer 4

我认为你有一些问题。但首先，您的适配器中只有一个图像按钮实例。因此，我认为只有列表中的最后一项才会绑定图像按钮。您应该为列表中的每个项目创建一个视图持有者，因为您需要将事件绑定到列表中的每个项目，以便将项目的索引与该视图所有者一起存储。所以创建一个内部类（我将删除你的一些细节）：

public static class ViewHolder{
    public TextView playerName;
    public ImageButton profileButton;
}

在你的adpater中，getView属性处理viewHolder：

public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder row;
    if (convert View == null) {
        LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(R.layout.activity_chat_singlemessage, parent, false);
        row.playerName = (TextView) row.findViewById(R.id.playername_);
        row.profileButton = (ImageButton)   row.findViewById(R.id.ib_message);
        convertView.setTag(row);
    } else row = (ViewHolder) convertView.GetTag();
   row.setText(chatMessageObj.name);
   row.profileButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.e("log_tag",name+ID);
            Intent intent = new Intent(v.getContext(), NextActivity.class);
            v.getContext().startActivity(intent);
        }
    });

希望能让你前进。（从asadmshah复制了意图代码）

如何在列表视图中单击ImageButton时打开新活动？

4 个答案: