我正在尝试使用sharedPreference存储变量值，问题是每当我返回它时总是为NULL，即使我确定在退出之前为其分配了值 （我的应用程序获取用户编号并发送验证码并检查是否为真，如果是，则检查变量存储为真）
public class Verify extends Activity {
TextView Number;
EditText numf;
TextView codet;
EditText codef;
TextView vcs;
Button verify;
Button numOK;
ProgressBar pb;
TextView vs;
String cs;
TextView vr;
TextView checkSave;
TextView textViewShowTime;
String check;
int code;
int min = 00000;
int max = 99999;
private CountDownTimer countDownTimer; // built in android class
// CountDownTimer
private long totalTimeCountInMilliseconds; // total count down time in
// milliseconds
private long timeBlinkInMilliseconds; // start time of start blinking
private boolean blink; // controls the blinking .. on and off
long seconds;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.verifiy_activity);
Number = (TextView) findViewById(R.id.Number);
numf = (EditText) findViewById(R.id.numf);
codet = (TextView) findViewById(R.id.codet);
codef= (EditText) findViewById(R.id.codef);
vcs = (TextView) findViewById(R.id.vcs);
verify = (Button) findViewById(R.id.verify);
numOK = (Button) findViewById(R.id.numOK);
pb = (ProgressBar) findViewById(R.id.pb);
vs = (TextView) findViewById(R.id.vs);
vr = (TextView) findViewById(R.id.vr);
checkSave = (TextView) findViewById(R.id.checkSave);
textViewShowTime = (TextView) findViewById(R.id.tvTimeCount);
final SmsManager sm = SmsManager.getDefault();
checkGSM();
Toast.makeText(getApplicationContext(), "1"+check, Toast.LENGTH_LONG).show();
//OK button Start
numOK.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(seconds==0)
{
setTimer();
startTimer();
Random r = new Random();
code = r.nextInt(max - min + 1) + min;
cs=String.valueOf(code);
//sm.sendTextMessage(Number.getText().toString(), null,cs, null, null);
pb.setVisibility(View.VISIBLE);
Toast.makeText(getApplicationContext(), cs, Toast.LENGTH_LONG).show();
}
}
});
//Verify Button Start
verify.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
vcs.setVisibility(View.INVISIBLE);
pb = (ProgressBar) findViewById(R.id.pb);
codef= (EditText) findViewById(R.id.codef);
vcs = (TextView) findViewById(R.id.vcs);
vr = (TextView) findViewById(R.id.vr);
if(!(codef.getText().toString().equals(cs))&&codef.getText().length()!=0)
{
vcs.setVisibility(View.VISIBLE);
vcs.setText("Wrong Verification Code,Try Again");
//pb.setVisibility(View.INVISIBLE);
codef.setText("");
callCheck();
Toast.makeText(getApplicationContext(), cs, Toast.LENGTH_LONG).show();
}
else if(codef.getText().toString().equals(cs))
{
callCheck1();
vr.setTextColor(Color.GREEN);
vr.setText("Verified");
pb.setVisibility(View.GONE);
textViewShowTime.setVisibility(View.INVISIBLE);
checkSave.setVisibility(View.VISIBLE);
Toast.makeText(getApplicationContext(), "2"+check, Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(),
"hes"+ check, Toast.LENGTH_SHORT).show();
setCheck("true");
Toast.makeText(getApplicationContext(), "3"+check, Toast.LENGTH_LONG).show();
}
}
});
Toast.makeText(getApplicationContext(),
"4"+ check, Toast.LENGTH_SHORT).show();
codef.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
});
//check verification code
codef.setOnFocusChangeListener(new OnFocusChangeListener() {
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus==true)
{
}
else
{
//codef.getText().length()!=0
//vcs.setVisibility(View.GONE);
/*if(!(codef.getText().toString().equals(cs))&&codef.getText().length()!=0)
{
vcs.setVisibility(View.VISIBLE);
vcs.setText("Wrong Verification Code,Try Again");
pb.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(), cs, Toast.LENGTH_LONG).show();
}
else if(codef.getText().toString().equals(cs))
{
vr.setTextColor(Color.GREEN);
vr.setText("Verified");
pb.setVisibility(View.GONE);
}*/
}
}
});
//Verify Button End
}
public void setCheck(String x)
{
check=x;
Toast.makeText(getApplicationContext(), "5"+check, Toast.LENGTH_LONG).show();
}
public void checkGSM()
{
if(vr.equals("Verified"))
{
check="true";
}
else
{
check="false";
}
}
public void reset()
{
countDownTimer.cancel();
}
private void setTimer() {
int time = 5;
if(countDownTimer==null)
{
totalTimeCountInMilliseconds = 60 * time * 1000;
}
else
{
reset();
totalTimeCountInMilliseconds = 60 * time * 1000;
}
}
private void startTimer() {
countDownTimer = new CountDownTimer(totalTimeCountInMilliseconds, 500) {
// 500 means, onTick function will be called at every 500
// milliseconds
//@Override
public void onTick(long leftTimeInMilliseconds) {
seconds = leftTimeInMilliseconds / 1000;
textViewShowTime.setText(String.format("%02d", seconds / 60)
+ ":" + String.format("%02d", seconds % 60));
// format the textview to show the easily readable format
}
@Override
public void onFinish() {
// this function will be called when the timecount is finished
textViewShowTime.setText("Time up!");
textViewShowTime.setVisibility(View.VISIBLE);
}
}.start();
}
//Check Function Start
public void callCheck1()
{
// Creating alert Dialog with one Button
AlertDialog alertDialog1 = new AlertDialog.Builder(
Verify.this).create();
// Setting Dialog Title
alertDialog1.setTitle("Phone Number Saved");
// Setting Dialog Message
alertDialog1.setMessage("Your Phone Number Was Saved Successfully");
// Setting OK Button
alertDialog1.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
// closed
Toast.makeText(getApplicationContext(),
"You clicked on OK", Toast.LENGTH_SHORT).show();
}
});
// Showing Alert Message
alertDialog1.show();
}
//Check Function Start
public void callCheck()
{
// Creating alert Dialog with one Button
AlertDialog alertDialog1 = new AlertDialog.Builder(
Verify.this).create();
// Setting Dialog Title
alertDialog1.setTitle("SMS verification");
// Setting Dialog Message
alertDialog1.setMessage("Wrong Verification Code");
// Setting OK Button
alertDialog1.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
// closed
Toast.makeText(getApplicationContext(),
"You clicked on OK", Toast.LENGTH_SHORT).show();
}
});
// Showing Alert Message
alertDialog1.show();
}
public void savePreferences2(String key, boolean value) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
Editor editor = sharedPreferences.edit();
editor.putBoolean(key, value);
editor.commit();
}
public void savePreferences(String key, String value) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
Editor editor = sharedPreferences.edit();
editor.putString(key, value);
editor.commit();
}
public void loadSavedPreferences() {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
SharedPreferences sharedPreferences2 = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
String name = sharedPreferences.getString("storedAct","xx");
check=name.toString();
Toast.makeText(getApplicationContext(), "6"+check, Toast.LENGTH_LONG).show();
if(check.equals("true"))
{
vr.setText("Activated");
//Toast.makeText(getApplicationContext(),
// "hello"+check, Toast.LENGTH_SHORT).show();
}
else
{
vr.setText("Still");
}
/* if(name!=UserNumber)
{
nfield.setText(UserNumber);
}
else
{
nfield.setText(name);
}
*/
}
@Override
public void onStart(){
super.onStart();
loadSavedPreferences();
}
public void onPause()
{
super.onPause();
savePreferences("storedِAct",check);
}
public void onResume()
{
super.onResume();
loadSavedPreferences();
}
@Override
public void onStop(){
super.onStop();
savePreferences("storedِAct",check);
}
//End Save Settings On Close
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
答案 0 :(得分：1)
好的，要存储设置，请使用：
public void savePreferences(String key, String value) {
// We need an Editor object to make preference changes.
//"mySettings" is the name of settings file, and MODE_PRIVATE means that (from the docs):
//the created file can only be accessed by the calling application (or all applications //sharing the same user ID).
SharedPreferences settings = getSharedPreferences("mySettings", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString(key, value);
// Commit the edits!
editor.commit();
}
并阅读：
public void loadSavedPreferences() {
// Restore preferences
SharedPreferences settings = getSharedPreferences("mySettings", Activity.MODE_PRIVATE);
check = settings.getString("storedAct", "false");
//rest of the code
}
请同时检查用于保存首选项的onPause（）和onStop（）键名称。它是“storedAct”，但由于某种原因，它在这里显示奇怪，在我的编辑器和loadSavedPreferences（）中，你的密钥是“storedAct”，但它显示正确，所以它可能是你的密钥没有的问题匹配:)此外，仅在onPause（）中保存您的首选项，从onStop（）中删除它并将其加载到onResume（）中（从onStart（）中删除。）
答案 1 :(得分：0)
首先，您确定使用相同的密钥来存储和检索该值吗？ （这看起来很愚蠢，但只是为了确保...）
然后你也可以尝试使用this.getSharedPreferences（String name，int mode） 有了这个你的活动和名称，你的喜好的任何唯一名称（如你的应用程序全名）
答案 2 :(得分：0)
您必须在活动的onStop（）中删除对savePreference（）的调用。此时变量可能为null。 在该点尝试日志输出以检查字符串的值。