问题
the app run ordinary but when i click in button send ,emulator has fortunatly stopped and this error in Logcat: java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView.
i search for this problem and found solution for other project and not similer to this project
mainactivity(chat):
package com.example.doctor;
import android.app.Activity;
import android.content.Intent;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.AbsListView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
public class chat extends Activity {
private ChatArrayAdapter adp;
private ListView list;
private EditText chatText;
private Button send;
Intent in;
private Boolean side =false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chat1);
Intent i=getIntent();
send=(Button)findViewById(R.id.btn);
list=(ListView)findViewById(R.id.ListView);
adp=new ChatArrayAdapter(getApplicationContext(),R.layout.chat2);
chatText=(EditText)findViewById(R.id.chat);
chatText.setOnKeyListener(new OnKeyListener(){
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if((event.getAction()==KeyEvent.ACTION_DOWN)&&(keyCode==KeyEvent.KEYCODE_ENTER))
{
return sendChatMessage();
}
return false;
}
});
send.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
sendChatMessage();
}});
list.setTranscriptMode(AbsListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
list.setAdapter(adp);
adp.registerDataSetObserver(new DataSetObserver() {
public void OnChanged()
{
super.onChanged();
list.setSelection(adp.getcount()-1);
}
} );
}
private boolean sendChatMessage() {
adp.add(new ChatMessage(side,chatText.getText().toString()));
chatText.setText("");
side=!side;
return true;
}
}
ChatArrayAdapter
package com.example.doctor;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.text.Layout;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
public class ChatArrayAdapter extends ArrayAdapter<ChatMessage> {
private TextView chatText;
private static List<ChatMessage> MessageList =new ArrayList<ChatMessage> ();
private LinearLayout layout;
public ChatArrayAdapter(Context context, int resource) {
super(context, resource, MessageList);
// TODO Auto-generated constructor stub
}
public void add(ChatMessage object) {
MessageList.add(object);
super.add(object);
}
public int getcount()
{
return this.MessageList.size();
}
public ChatMessage getitem(int index)
{
return this.MessageList.get(index);
}
public View getview(int position,View convertView,ViewGroup parent)
{
View v=convertView;
if(v==null)
{
LayoutInflater inflater= (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v=inflater.inflate(R.layout.chat2, parent, false);
}
layout =(LinearLayout)v.findViewById(R.id.messag1);
ChatMessage messageobj=getitem(position);
chatText=(TextView)v.findViewById(R.id.singlemessage);
chatText.setText(messageobj.message);
chatText.setBackgroundResource(messageobj.left ? R.drawable.pic_a :R.drawable.pic_b);
layout.setGravity(messageobj.left?Gravity.LEFT:Gravity.RIGHT);
return v;
}
public Bitmap decodeToBitmap(byte[]decodebyte)
{
return BitmapFactory.decodeByteArray(decodebyte, 0, decodebyte.length);
}
}
chat2.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/messag1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" />
<TextView
android:id="@+id/singlemessage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:background="@drawable/pic_b"
android:paddingLeft="10dip"
android:text="@string/hello"
android:textColor="@android:color/primary_text_light" />
</LinearLayout>
chat1.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/ListView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="80dp"
/>
<RelativeLayout
android:id="@+id/form"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:orientation="vertical" >
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:ems="10"
android:id="@+id/chat"
android:layout_alignParentLeft="true"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@+id/btn"
android:labelFor="@+id/chat"/>
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/chat"
android:layout_alignParentRight="true"
android:text="@string/send" />
</RelativeLayout>
</RelativeLayout>
回答1:
chat2.xml must contain a TextView, not a LinearLayout. Right now you have your TextView wrapped in a LinearLayout, therefore you are getting the Exception.
The constructor or ArrayAdapter you are using in ChatArrayAdapter by calling super(...) expects the R.id. for a TextView, not LinearLayout.
See here
来源：https://stackoverflow.com/questions/35719300/arrayadapter-requires-the-resource-id-to-be-a-textview