我遇到SharedPreferences问题。我有两个活动：MainActivity和SettingsActivity。当MainActivity正在strating时，在onCreate方法中我默认创建设置并检查或者这是第一次运行应用程序。当我转到SettingsActivity时，我会检查或默认设置是否存在，并尝试从这些设置中设置我的类字段。但是在loadExistSettings（）方法中if-statement不执行。
public class MainActivity extends Activity {
public static SharedPreferences defaultSettings;
//----------------------
public boolean ledOn = false;
//----------------------
ImageButton switcher;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
switcher = (ImageButton) findViewById(R.id.switcher);
defaultSettings = getSharedPreferences(SettingsActivity.APP_PREFERENCES, Context.MODE_PRIVATE);
if(!defaultSettings.getBoolean("hasVisited", false)){
createDefaultSettings();
SharedPreferences.Editor editor = defaultSettings.edit();
editor.putBoolean("hasVisited", true);
editor.commit();
}
}
public void switchLED(View view){
if(!ledOn){
switcher.setImageResource(R.drawable.imgon);
ledOn = true;
}else{
switcher.setImageResource(R.drawable.imgoff);
ledOn = false;
}
}
public void showSettings(View v){
Intent intent = new Intent(this, SettingsActivity.class);
startActivity(intent);
}
public void createDefaultSettings(){
SharedPreferences.Editor editor = defaultSettings.edit();
editor.putBoolean(SettingsActivity.NORMAL_MODE, true);
editor.putBoolean(SettingsActivity.VIBRO_MODE, true);
editor.putBoolean(SettingsActivity.SILENT_MODE, true);
editor.putBoolean(SettingsActivity.INCOMING_CALL, true);
editor.putBoolean(SettingsActivity.SMS_INCOME, true);
editor.putInt(SettingsActivity.BATTERY_SHUTDOWN, 50);
editor.putInt(SettingsActivity.DELAY_ON, 300);
editor.putInt(SettingsActivity.DELAY_OFF, 300);
editor.putInt(SettingsActivity.SMS_REPEAT, 3);
editor.commit();
}
}
public class SettingsActivity extends Activity {
public static final String APP_PREFERENCES = "applicationSettings";
public static final String NORMAL_MODE = "workInNormalMode";
public static final String VIBRO_MODE = "workInVibroMode";
public static final String SILENT_MODE = "workInSilentMode";
public static final String INCOMING_CALL = "workWhenIncomingCall";
public static final String SMS_INCOME = "workWhenSMSIncome";
public static final String BATTERY_SHUTDOWN = "battery";
public static final String DELAY_ON = "on";
public static final String DELAY_OFF = "off";
public static final String SMS_REPEAT = "smsRepeat";
public static SharedPreferences appSettings;
public static boolean inNormalMode = true;
public static boolean inVibroMode = true;
public static boolean inSilentMode = true;
public static boolean whenIncomingCall = true;
public static boolean whenSmsIncome = true;
public static int battery = 10;
public static int sleepOn = 300;
public static int sleepOff = 300;
public static int smsRepeat = 3;
CheckBox checkNormalMode;
CheckBox checkVibroMode;
CheckBox checkSilentMode;
CheckBox checkIncomingCall;
CheckBox checkIncomingSms;
TextView percentValue;
SeekBar delayOn;
TextView delayOnValue;
SeekBar delayOff;
TextView delayOffValue;
SeekBar sms;
TextView smsRepeatValue;
Button accept;
Button cancel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
appSettings = getSharedPreferences(APP_PREFERENCES, Context.MODE_PRIVATE);
checkNormalMode = (CheckBox) findViewById(R.id.checkBox1);
checkVibroMode = (CheckBox) findViewById(R.id.checkBox2);
checkSilentMode = (CheckBox) findViewById(R.id.checkBox3);
checkIncomingCall = (CheckBox) findViewById(R.id.checkBox4);
checkIncomingSms = (CheckBox) findViewById(R.id.checkBox1);
percentValue = (TextView)findViewById(R.id.textView15);
delayOn = (SeekBar) findViewById(R.id.seekBar);
delayOn.incrementProgressBy(100);
delayOn.setMax(2000);
delayOnValue = (TextView)findViewById(R.id.textView16);
delayOff = (SeekBar) findViewById(R.id.seekBar2);
delayOff.incrementProgressBy(100);
delayOff.setMax(2000);
delayOffValue = (TextView) findViewById(R.id.textView17);
sms = (SeekBar) findViewById(R.id.seekBar3);
sms.incrementProgressBy(1);
sms.setMax(5);
smsRepeatValue = (TextView) findViewById(R.id.textView18);
accept = (Button) findViewById(R.id.button);
cancel = (Button) findViewById(R.id.button2);
loadExistSettings();
//Отримати мінімальне допустиме значення батареї
percentValue.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(SettingsActivity.this);
builder.setTitle("Мінімальний заряд батареї");
final EditText input = new EditText(SettingsActivity.this);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
builder.setView(input);
builder.setNegativeButton("Відміна", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.setPositiveButton("ОК", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
battery = Integer.parseInt(input.getText().toString());
percentValue.setText(String.valueOf(battery).toCharArray(), 0, String.valueOf(battery).toCharArray().length);
}
});
AlertDialog alert = builder.create();
alert.show();
}
});
//Отримати час скільки спалах має бути увімкнений
delayOn.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
sleepOn = progress;
delayOnValue.setText(String.valueOf(sleepOn).toCharArray(), 0, String.valueOf(sleepOn).toCharArray().length);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
//Отримати час скільки спалах має бути вимкнений
delayOff.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
sleepOff = progress;
delayOffValue.setText(String.valueOf(sleepOff).toCharArray(), 0, String.valueOf(sleepOff).toCharArray().length);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
//Отримати кількість повторень при вхідних смс
sms.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
smsRepeat = progress;
smsRepeatValue.setText(String.valueOf(smsRepeat).toCharArray(), 0, String.valueOf(smsRepeat).toCharArray().length);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
//Прийняти налаштування
accept.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(checkNormalMode.isChecked()) { inNormalMode = true; } else { inNormalMode = false; }
if(checkVibroMode.isChecked()) { inVibroMode = true; } else { inVibroMode = false; }
if(checkSilentMode.isChecked()) { inSilentMode = true; } else { inSilentMode = false; }
if(checkIncomingCall.isChecked()) { whenIncomingCall = true; } else { whenIncomingCall = false; }
if(checkIncomingSms.isChecked()) { whenSmsIncome = true; } else { whenSmsIncome = false; }
createPreferences();
}
});
//Відхилити налаштування
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
loadExistSettings();
}
});
}
public void createPreferences(){
SharedPreferences.Editor editor = appSettings.edit();
editor.putBoolean(NORMAL_MODE, inNormalMode);
editor.putBoolean(VIBRO_MODE, inVibroMode);
editor.putBoolean(SILENT_MODE, inSilentMode);
editor.putBoolean(INCOMING_CALL, whenIncomingCall);
editor.putBoolean(SMS_INCOME, whenSmsIncome);
editor.putInt(BATTERY_SHUTDOWN, battery);
editor.putInt(DELAY_ON, sleepOn);
editor.putInt(DELAY_OFF, sleepOff);
editor.putInt(SMS_REPEAT, smsRepeat);
editor.commit();
}
public void loadExistSettings(){
if(appSettings.contains(APP_PREFERENCES)){
inNormalMode = appSettings.getBoolean(NORMAL_MODE, true);
checkNormalMode.setChecked(inNormalMode);
inVibroMode = appSettings.getBoolean(VIBRO_MODE, true);
checkVibroMode.setChecked(inVibroMode);
inSilentMode = appSettings.getBoolean(SILENT_MODE, true);
checkSilentMode.setChecked(inSilentMode);
whenIncomingCall = appSettings.getBoolean(INCOMING_CALL, true);
checkIncomingCall.setChecked(whenIncomingCall);
whenSmsIncome = appSettings.getBoolean(SMS_INCOME, true);
checkIncomingSms.setChecked(whenSmsIncome);
battery = appSettings.getInt(BATTERY_SHUTDOWN, 20);
percentValue.setText(String.valueOf(battery).toCharArray(), 0, String.valueOf(battery).toCharArray().length);
sleepOn = appSettings.getInt(DELAY_ON, 300);
delayOnValue.setText(String.valueOf(sleepOn).toCharArray(), 0, String.valueOf(sleepOn).toCharArray().length);
sleepOff = appSettings.getInt(DELAY_OFF, 300);
delayOffValue.setText(String.valueOf(sleepOff).toCharArray(), 0, String.valueOf(sleepOff).toCharArray().length);
smsRepeat = appSettings.getInt(SMS_REPEAT, 3);
smsRepeatValue.setText(String.valueOf(smsRepeat).toCharArray(), 0, String.valueOf(smsRepeat).toCharArray().length);
}
}
}
答案 0 :(得分：0)
下面：
if(appSettings.contains(APP_PREFERENCES)){
///.....you code here
}
if条件始终为false，因为APP_PREFERENCES是首选项名称，而不是appSettings首选项中可用的键名。
要正确使用SharedPreferences.contains，请在访问以下值之前使用密钥名称检查当前SharedPreferences中是否存在密钥：
if(appSettings.contains(NORMAL_MODE)){
inNormalMode = appSettings.getBoolean(NORMAL_MODE, true);
checkNormalMode.setChecked(inNormalMode);
}