以下是我要做的事情： 我有2个活动，一个MainActivity和一个在MA中单击按钮时打开的SettingsActivity。在SA中，有6个单选按钮，每个按钮在无线电组中具有相应的颜色ID（如if / else语句中所示），以及用于关闭活动的按钮。当用户按下关闭按钮时，MA的背景变为用户选择的颜色。一切都运行良好，除了getCheckedRadioButtonId（）方法获取创建SettingsActivity时选择的按钮的id，即无，因此显示的颜色始终是最后一个else块中的颜色。我知道这应该是一个非常简单的修复，但我花了大约4个小时尝试我能想到的每个解决方案，并且我的许多谷歌搜索都没有给我任何有用的东西。这是相关的代码：
SettingsActivity.java：
public class SettingsActivity extends AppCompatActivity {
public static final String colorID = "colorID";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
LayoutInflater inflater = LayoutInflater.from(SettingsActivity.this);
View settingsView= inflater.inflate(R.layout.activity_settings, null);
returnToMain();
}
public int getColorValueID(View view) {
final int colorId;
int id;
final RadioGroup radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);
if(radioGroup.getCheckedRadioButtonId()!= -1) {
id = radioGroup.getCheckedRadioButtonId();
}
else {
id = 0;
}
if (id == R.id.redButton) {
colorId = R.color.red_theme;
} else if (id == R.id.blueButton) {
colorId = R.color.blue_theme;
} else if (id == R.id.greenButton) {
colorId = R.color.green_theme;
} else if (id == R.id.orangeButton) {
colorId = R.color.orange_theme;
} else if (id == R.id.purpleButton) {
colorId = R.color.purple_theme;
} else {
colorId = R.color.blue_theme;
}
return colorId;
}
public void returnToMain(){
Button returnButton = (Button) findViewById(R.id.backToMain);
returnButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
LayoutInflater inflater = LayoutInflater.from(SettingsActivity.this);
View settingsView= inflater.inflate(R.layout.activity_settings, null);
int color = getColorValueID(settingsView);
final Intent mIntent = new Intent();
mIntent.putExtra(colorID, color);
setResult(RESULT_OK, mIntent);
finish();
}
});
}
}
activity_settings.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_settings"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.rileybolen.simplemortgagecalculator.SettingsActivity"
tools:background="#dedede">
<TextView
android:text="@string/settings"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:id="@+id/settingsHeading"
android:textColor="#494949"
android:textSize="32sp"
android:textAlignment="center"
/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/themeHeading"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:id="@+id/radioGroup">
<RadioButton
android:text="Orange"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/orangeButton"
android:layout_alignParentTop="true"
android:textColor="@color/orange_theme"
android:textSize="18sp"
android:layout_marginLeft="20dp"
/>
<RadioButton
android:text="Purple"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/purpleButton"
android:layout_below="@id/orangeButton"
android:textColor="@color/purple_theme"
android:textSize="18sp"
android:layout_marginLeft="20dp"/>
<RadioButton
android:text="Grey"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/greyButton"
android:layout_below="@id/purpleButton"
android:textColor="#494949"
android:textSize="18sp"
android:layout_marginLeft="20dp"/>
<RadioButton
android:text="Red"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/redButton"
android:layout_alignParentTop="true"
android:textColor="@color/red_theme"
android:textSize="18sp"
android:layout_marginLeft="20dp"/>
<RadioButton
android:text="Blue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/blueButton"
android:layout_below="@id/redButton"
android:textColor="@color/blue_theme"
android:textSize="18sp"
android:layout_marginLeft="20dp"/>
<RadioButton
android:text="Green"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/greenButton"
android:layout_below="@id/blueButton"
android:textColor="@color/green_theme"
android:textSize="18sp"
android:layout_marginLeft="20dp"/>
</RadioGroup>
<TextView
android:text="@string/theme_heading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="28dp"
android:id="@+id/themeHeading"
android:textColor="#494949"
android:textSize="24sp"
android:layout_below="@+id/settingsHeading"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
<Button
android:text="Close"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/backToMain"
android:layout_alignParentBottom="true"
/>
</RelativeLayout>
答案 0 :(得分：0)
在onCheckedChanged(RadioGroup group, int checkedId)
RadioGroup听众
radioGroup.setOnCheckedChangedListener(new OnCheckChangedListener(){
public void onCheckedChanged(RadioGroup group, int checkedId) {
}
});
像这样......