我是 android 新手，我正在尝试使用无线电组的示例程序。我在单选组下声明了 2 个单选按钮。我想在其中选择哪个单选按钮
无线电组。因为想要在匿名类新的 onClickListener 的 if 和 elseif 条件中使用它。
我尝试声明一个整数变量 radio_selected 并获取 radgrp.getCheckedRadioButtonId() 的返回值
radio_selected = radgrp.getCheckedRadioButtonId();并在 if 和 else if 条件中使用常量进行比较，如下所示：
if( radio_selected == R.id.rdb1 && (edit1.getText().toString().equals("admin")) && (edit2.getText().toString().equals("admin")))
我尝试打印 radio_selected 的值。它打印我-1，这意味着空选择。但是 radgrp.getCheckedRadioButtonId();返回一个整数值。
然而，上面的程序编译并工作正常，但我想知道为什么我不能使用 radio_selected 常量进行比较？
.java 文件
package android.button;
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.method.KeyListener;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.Toast;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class Android_eg2 extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final int radio_selected;
final EditText edit1 = (EditText)findViewById(R.id.txt1);
final EditText edit2 = (EditText)findViewById(R.id.txt2);
edit2.setOnKeyListener(new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(edit2.getText().toString().length()>5){
Toast.makeText(getApplicationContext(), "EXCEEDED the MAX LIMIT", Toast.LENGTH_LONG).show();
}
return false;
}
});
final RadioGroup radgrp = (RadioGroup)findViewById(R.id.rad);
//radio_selected = radgrp.getCheckedRadioButtonId();
Button bt = (Button)findViewById(R.id.button);
bt.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//System.out. println(radgrp.getCheckedRadioButtonId());
//System.out.println(radio_selected);
// TODO Auto-generated method stub
if(R.id.button == v.getId()){
if( radgrp.getCheckedRadioButtonId() == R.id.rdb1 && (edit1.getText().toString().equals("admin")) && (edit2.getText().toString().equals("admin"))){
Toast.makeText(getApplicationContext(),"LOGIN SUCCESS FOR ADMIN",Toast.LENGTH_LONG).show();
Log.v("TAG","In admin");
}
else if(radgrp.getCheckedRadioButtonId() == R.id.rdb2 && (edit1.getText().toString().equalsIgnoreCase("user")) && (edit2.getText().toString().equalsIgnoreCase("user"))){
Toast.makeText(getApplicationContext(),"LOGIN SUCCESS FOR USER",Toast.LENGTH_LONG).show();
Log.v("TAG","In user");
}
else{
Toast.makeText(getApplicationContext(),"INVALID ENTRY",Toast.LENGTH_LONG).show();
Log.v("TAG","Invalid");
}
}
}
});
radgrp.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
switch(checkedId){
case R.id.rdb1:
//Toast.makeText(getApplicationContext(),"ADMIN",Toast.LENGTH_LONG).show();
case R.id.rdb2:
//Toast.makeText(getApplicationContext(),"USER",Toast.LENGTH_LONG).show();
}
}
});
}
}
main.xml 文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Welcome to wipro"
/>
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<RadioGroup
android:id="@+id/rad"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<RadioButton
android:id="@+id/rdb1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text = "Admin"
>
</RadioButton>
<RadioButton
android:id="@+id/rdb2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text = "User"
>
</RadioButton>
</RadioGroup>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<TextView
android:id="@+id/lbl1"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="USER NAME"
android:textSize="6pt"
android:textColor = "#00aa00"
>
</TextView>
<EditText
android:id="@+id/txt1"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text=""
android:textSize="6pt"
android:textColor = "#aa0000"
>
</EditText>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<TextView
android:id="@+id/lbl2"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="PASSWORD"
android:textSize="6pt"
android:textColor="#00aa00"
android:layout_weight="1"
>
</TextView>
<EditText
android:id="@+id/txt2"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text=""
android:textSize="6pt"
android:textColor = "#aa0000"
android:password = "true"
>
</EditText>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="SUBMIT"
>
</Button>
</LinearLayout>
</LinearLayout>
R.java 文件
/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
package android.button;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int icon=0x7f020000;
}
public static final class id {
public static final int button=0x7f050007;
public static final int lbl1=0x7f050003;
public static final int lbl2=0x7f050005;
public static final int rad=0x7f050000;
public static final int rdb1=0x7f050001;
public static final int rdb2=0x7f050002;
public static final int txt1=0x7f050004;
public static final int txt2=0x7f050006;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int app_name=0x7f040001;
public static final int hello=0x7f040000;
}
}
