[英]How to hide next button and show when radio group button is selected
如何隱藏下一個按鈕,並且僅當用戶選擇單選按鈕時才會顯示
我有這個XML代碼
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RadioGroup
android:id="@+id/radioSex"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/assembly"
android:checked="false"
/>
<RadioButton
android:id="@+id/csharp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/java"
android:checked="false" />
<Button
android:id="@+id/btnDisplay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="NEXT"
android:onClick="OnClick"
/>
</RadioGroup>
</LinearLayout>
和這個班級代碼
package com.example.quiz;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
/**
* Created by leste on 3/5/2016.
*/
public class CS_Category extends Activity {
private RadioGroup radioSexGroup;
private RadioButton radioSexButton;
private Button btnDisplay;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.cs_category);
addListenerOnButton();
}
public void addListenerOnButton() {
radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
btnDisplay = (Button) findViewById(R.id.btnDisplay);
btnDisplay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// get selected radio button from radioGroup
int selectedId = radioSexGroup.getCheckedRadioButtonId();
radioSexButton = (RadioButton) findViewById(selectedId);
if (radioSexButton.getId() == R.id.assembly) {
Intent i = new Intent(CS_Category.this, CS_Assembly.class);
startActivity(i);
} else {
if (radioSexButton.getId() == R.id.csharp) {
Intent i = new Intent(CS_Category.this, CS_Csharp.class);
startActivity(i);
} else {
if (radioSexButton.getId() == R.id.java) {
Intent i = new Intent(CS_Category.this, CS_Java.class);
startActivity(i);
}
}
Toast.makeText(CS_Category.this,
radioSexButton.getText(), Toast.LENGTH_SHORT).show();
}
}
});
}
}
我應該怎么做才能隱藏下一個按鈕並僅在選中單選按鈕時顯示
在您的按鈕xml中,您應該使用:
機器人:能見度=“水漲船高”
在Java中,您應該使用:
btnDisplay.setVisibility(View.VISIBLE);
首先,我將按鈕從廣播組中移出並放在其下方。 然后在我的Java代碼中,我將具有以下功能:
public void onRadioButtonClicked(View view) {
// Is the button now checked?
boolean checked = ((RadioButton) view).isChecked();
// Check which radio button was clicked
switch(view.getId()) {
case R.id.assembly:
if (checked)
make_button_visible();
break;
case R.id.csharp:
if (checked)
make_button_visible();
break;
}
}
確保每個單選按鈕都設置了onClick =“ onRadioButtonClicked”。
然后有一個名為make_button_visible()的函數,其中包含以下幾行:
Button mButton=(Button)findViewById(R.id.btnDisplay);
mButton.setVisibility(View.VISIBLE);//This will make it visible
在onCreate方法中添加以下代碼
addListenerOnButton();
btnDisplay.setVisibility(View.INVISIBLE);
radioSexGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
if (btnDisplay.getVisibility() == View.INVISIBLE)
btnDisplay.setVisibility(View.VISIBLE);
}
});
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