我正在我的应用程序中创建一个安全设置部分。
有3个单选按钮允许用户在密码、TouchID或什么都不选择之间进行选择。默认情况下，所有单选按钮都未选中。单击单选按钮(例如使用密码(时，该代码会检查用户是否设置了密码。如果用户没有，则会显示一个对话框，并且单选按钮保持未选中状态。然后用户去设置一个密码(setUpPasscode按钮(。
设置后，密码活动将以返回大小写"2"结束，并且应选中带有密码选项的单选按钮。但事实并非如此。当我重新启动应用程序时，按钮会被选中。不知何故，它不会在完成前一项活动后立即进行检查，但它是经过技术检查的。我做错了什么？
public class SecuritySettings extends AppCompatActivity
{
TextView goBackToSettings;
Button setUpPasscode;
Button setUpTouchID;
RadioButton usePasscodeSelection;
RadioButton useTouchIDSelection;
RadioButton useNeitherSelection;
SharedPreferences sharedPreferences;
SharedPreferences.Editor editor;
Dialog myDialog;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.security_settings);
goBackToSettings = (TextView) findViewById(R.id.closeSettingsButtonID);
setUpPasscode = (Button) findViewById(R.id.setUpPasscodeButtonID);
setUpTouchID = (Button) findViewById(R.id.setUpTouchIDButtonID);
usePasscodeSelection = (RadioButton) findViewById(R.id.usePasscode);
useTouchIDSelection = (RadioButton) findViewById(R.id.useTouchID);
useNeitherSelection = (RadioButton) findViewById(R.id.useNothing);
myDialog = new Dialog(this);
//load state of radio buttons
loadRadioButtons();
// go back to main settings page
goBackToSettings.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Intent goBackToMainSettings = new Intent(getApplicationContext(), AppSettings.class);
goBackToMainSettings.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(goBackToMainSettings);
finish();
}
});
//Open new activity for setting passcode
setUpPasscode.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
Intent setUpPasscodeActivity = new Intent(getApplicationContext(), SetupPasscode.class);
startActivityForResult(setUpPasscodeActivity, 2);
}
});
// Open new activity for setting up TouchID
setUpTouchID.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
Intent setupTouchIDActivity = new Intent(getApplicationContext(), SetupTouchID.class);
startActivityForResult(setupTouchIDActivity, 1);
}
});
// when clicked, all other buttons become unchecked and the state of the buttons are saved
usePasscodeSelection.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
boolean bCheckForPasscode = doesUserHavePasscode();
// If true, user has a passcode setup
if (bCheckForPasscode)
{
usePasscodeSelection.setChecked(true);
useTouchIDSelection.setChecked(false);
useNeitherSelection.setChecked(false);
saveRadioButtons();
}
else
{
//No passcode detected for user
// Load previous radio button configuration since the selection wasn't valid
loadRadioButtons();
NoOptionSetPopup(null, "You must set up a passcode to enable this option.");
}
}
});
useTouchIDSelection.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
boolean bCheckForTouchID = doesUserHaveTouchIDSetup();
// If true, user has TouchID setup
if (bCheckForTouchID)
{
usePasscodeSelection.setChecked(false);
useTouchIDSelection.setChecked(true);
useNeitherSelection.setChecked(false);
saveRadioButtons();
}
else
{
//No passcode detected for user
// Load previous radio button configuration since the selection wasn't valid
loadRadioButtons();
NoOptionSetPopup(null, "You must set up TouchID to enable this option.");
}
}
});
useNeitherSelection.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
usePasscodeSelection.setChecked(false);
useTouchIDSelection.setChecked(false);
useNeitherSelection.setChecked(true);
saveRadioButtons();
}
});
}
// Open sharedpreferences and get the value that was saved there after setting up passcode using the same key 'string'
public boolean doesUserHavePasscode()
{
sharedPreferences = getApplicationContext().getSharedPreferences("MyPref", 0);
String checkHashString = sharedPreferences.getString("hashed_password", null);
if (checkHashString == null)
{
return false;
}
else
{
return true;
}
}
// Open sharedpreferences and get the value that was saved there after setting up TouchID using the same key 'string'
public boolean doesUserHaveTouchIDSetup()
{
sharedPreferences = getApplicationContext().getSharedPreferences("MyPref", 0);
boolean bDoesUserHaveTouchIDSetup = sharedPreferences.getBoolean("doesUserHaveTouchIDSetup", false);
return bDoesUserHaveTouchIDSetup;
}
public void NoOptionSetPopup(View v, String message)
{
TextView closePopup;
TextView contents;
myDialog.setContentView(R.layout.no_option_setup_popup);
closePopup = (TextView) myDialog.findViewById(R.id.closePopupButtonID);
contents = (TextView) myDialog.findViewById(R.id.theMessageID);
contents.setText(message);
closePopup.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
//Close popup
myDialog.dismiss();
}
});
myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
myDialog.show();
}
// Callback method to get the boolean from SetupPasscode/SetupTouchID activity & override the method
// What is being done here is that after a passcode/TouchID has been setup, we automatically assume that the newly set-up authentication will want to be used by the user.
// The values being returned from the activities only happen when they're successfully done (passed all validation checks).
// We then automatically make the corresponding radio button selected (if passcode setup, then select the 'use passcode on startup' radio button)
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode)
{
// Case for returning from SetupPasscode class
case 2:
// fetch the boolean value
boolean isDone = data.getBooleanExtra("isDone", false);
usePasscodeSelection.setChecked(isDone);
useTouchIDSelection.setChecked(false);
useNeitherSelection.setChecked(false);
saveRadioButtons();
loadRadioButtons();
break;
// Case for returning from SetupTouchID class
case 1:
// fetch the boolean value
boolean isTouchIDSetup = data.getBooleanExtra("isTouchIDDone", false);
usePasscodeSelection.setChecked(false);
useTouchIDSelection.setChecked(isTouchIDSetup);
useNeitherSelection.setChecked(false);
saveRadioButtons();
loadRadioButtons();
break;
default:
throw new IllegalStateException("Unexpected value: " + requestCode);
}
}
public void saveRadioButtons()
{
sharedPreferences = getApplicationContext().getSharedPreferences("MyPref", 0);
editor = sharedPreferences.edit();
editor.putBoolean("usePasscodeOption", usePasscodeSelection.isChecked());
editor.putBoolean("useTouchIDOption", useTouchIDSelection.isChecked());
editor.putBoolean("useNeitherOption", useNeitherSelection.isChecked());
}
public void loadRadioButtons()
{
sharedPreferences = getApplicationContext().getSharedPreferences("MyPref", 0);
usePasscodeSelection.setChecked(sharedPreferences.getBoolean("usePasscodeOption", false));
useTouchIDSelection.setChecked(sharedPreferences.getBoolean("useTouchIDOption", false));
useNeitherSelection.setChecked(sharedPreferences.getBoolean("useNeitherOption", false));
}
}
我建议重载onResume方法并检查单选按钮的状态，因为这将是流离开活动的最后一个控制。