我正在尝试制作聊天泡泡,我已经成功地使用了一个文本,但是当我想添加另一个文本以将时间放入泡泡时我必须添加RelativeLayout
来放置它在实际的线性布局上,但这次我得到一个错误。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:transitionGroup="true">
<RelativeLayout
android:id="@+id/my_lay"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="17sp"
android:text="test"
android:background="@drawable/sender_message_9"/>
<TextView
android:id="@+id/messageTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15sp"
android:text="12:12 PM"
android:layout_alignBottom="@id/message"
android:layout_alignRight="@id/message"
/>
</RelativeLayout>
</LinearLayout>
ADAPTER:
public class ChatAdapter extends ArrayAdapter<MessageProvider> {
private List<Message> list = new ArrayList<>();
private TextView TXT;
private RelativeLayout rLayout;
Context context;
...
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView == null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.source_message, parent, false);
}
...
TXT.setText(Message);
//Set Linear Changes
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
if(!POSITION){ // Moves the layout to the right
params.gravity = Gravity.RIGHT;
}else { // Moves it to the Left
params.gravity = Gravity.LEFT;
}
TXT.setLayoutParams(params);
return convertView;
}
}
ERROR:
05-05 00:10:44.563 8962-8962/com.example.example E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParams
感谢您的回答,谢谢。
答案 0 :(得分:3)
更改以下行
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
到
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
因为您已将textview包含在RelativeLayout
父级内。
答案 1 :(得分:1)
错误就是这一行
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
您正在使用线性布局参数进行相对布局。
尝试使用
RelativeLayout.LayoutParams params= new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);