没有什么发生时动态添加的EditText [英] Nothing happening when dynamically adding EditText
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问题描述
在我的Android项目,我试图从微调的值动态添加的EditText,但什么也没有发生。假设在微调我已经选择了两个那么它应该在布局中添加2的EditText或再选择3应该在布局中添加3的EditText。
In my Android Project, I am trying to add EditText dynamically from the value of Spinner but nothing is happening. Suppose In Spinner I have selected two then It should add 2 EditText in Layout or selected 3 then it should add 3 EditText in Layout.
我曾尝试和写了这code,
I have tried and written this code,
Spinner spinner;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
spinner=(Spinner)findViewById(R.id.spinner);
ArrayList<Integer> options=new ArrayList<Integer>();
for(int i=1;i<7;i++)
{
options.add(i);
}
ArrayAdapter<Integer> adapter=new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item,options);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3)
{
//Integer.parseInt(spinner.getSelectedItem().toString());
//int a=spinner.getSelectedItemPosition();
addEditView();
}
@Override
public void onNothingSelected(AdapterView<?> arg0)
{
// TODO Auto-generated method stub
}
});
}
public void addEditView()
{
final LinearLayout ll=new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
EditText et=new EditText(this);
et.setText("Edit text");
ll.addView(et);
}
XML文件,
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/noofedittexttv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="5dp"
android:layout_marginTop="30dp"
android:text="No of EditText "
android:layout_marginRight="5dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="30dp"
android:layout_toRightOf="@+id/noofpassengerstv"
android:background="@drawable/rounded_edittext" />
</RelativeLayout>
请建议我该怎么办?
感谢。
推荐答案
在这里你去。正如所说,需要将动态创建TextViews添加到容器中,在这种情况下的LinearLayout:
Here you go. As said, you need to add the dynamically created TextViews to a container, in this case the LinearLayout:
main.xml中:
main.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/main_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="50dp"
>
<TextView
android:id="@+id/noofedittexttv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="30dp"
android:text="No of EditText "
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
/>
</RelativeLayout>
MainActivity.java:
MainActivity.java:
package com.example.test;
import java.util.ArrayList;
import android.os.Bundle;
import android.R.integer;
import android.app.Activity;
import android.text.Layout;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Spinner;
public class MainActivity extends Activity {
Spinner spinner;
private LinearLayout textViewContainer;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
spinner = (Spinner) findViewById(R.id.spinner);
textViewContainer = (LinearLayout) findViewById(R.id.main_container);
ArrayList<Integer> options = new ArrayList<Integer>();
for (int i = 1; i < 7; i++) {
options.add(i);
}
ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,
android.R.layout.simple_spinner_item, options);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
addEditView(spinner.getSelectedItem());
}
});
}
public void addEditView(Object o) {
textViewContainer.removeAllViews();
Integer n = (Integer) o;
for(int i = 0; i < n; i++) {
EditText et = new EditText(this);
et.setText("Edit text: " + i);
textViewContainer.addView(et);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
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