问题描述:
动态创建radio button, 并将多个button添加到radio group中。但是实际运行时多个radiobutton会被同时选中:
代码如下:
mRadioGroup = findViewById(R.id.radioGroup);
mDevButtons = new RadioButton[device_count];
for(int i=0;i<device_count;i++) {
mDevButtons[i] = new RadioButton(mContext);
mDevButtons[i].setText(devices[i].getDeviceInfo());
if(mCurrnetDeviceName != null && devices[i].getDeviceInfo().contains(mCurrnetDeviceName)) {
mDevButtons[i].setChecked(true);
}
final UsbHidDevice device = devices[i];
mDevButtons[i].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCurrnetDeviceName = device.getDeviceName();
if (mCurrnetDeviceName != null) {
Toast.makeText(mContext, "Selected device: " + mCurrnetDeviceName, Toast.LENGTH_SHORT).show();
}
}
});
mRadioGroup.addView(mDevButtons[i]);
}
解决方法:
动态创建的radiobutton默认是没有button id的,需要主动分配button id。
mDevButtons[i].setId(View.generateViewId());
mRadioGroup = findViewById(R.id.radioGroup);
mDevButtons = new RadioButton[device_count];
for(int i=0;i<device_count;i++) {
mDevButtons[i] = new RadioButton(mContext);
mDevButtons[i].setText(devices[i].getDeviceInfo());
mDevButtons[i].setId(View.generateViewId());
if(mCurrnetDeviceName != null && devices[i].getDeviceInfo().contains(mCurrnetDeviceName)) {
mDevButtons[i].setChecked(true);
}
final UsbHidDevice device = devices[i];
mDevButtons[i].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCurrnetDeviceName = device.getDeviceName();
if (mCurrnetDeviceName != null) {
Toast.makeText(mContext, "Selected device: " + mCurrnetDeviceName, Toast.LENGTH_SHORT).show();
}
}
});
mRadioGroup.addView(mDevButtons[i]);
}
解决原因:
radiogoup多个button之间互斥就是通过记录button id实现的。如果radio button没有button id,radio group无法得知具体是哪个button被选中,也就无法实现多个button互斥的功能。