我创建了一个使用sharedpreference存储数字的应用程序，但每当我重新安装或更新该应用程序时，数字值都会被删除或检索到与实际数字不同的值。
发生的情况示例：得分=300
将显示0或250
为什么会这样？
共享首选项代码
package com.example.warrenedy.julyfinal;
import android.app.Activity;
import android.content.SharedPreferences;
import android.graphics.drawable.Drawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.content.Context;
import android.content.Intent;
import pl.droidsonroids.gif.GifImageView;
public class TestScreen extends Activity implements View.OnClickListener{
Button btnAutoEmotionCrush, btnEmotionVictory, btnSolve, btnFlow, btnMediate, btnExercise, btnTestScreen2;
int counter = 0;
TextView text;
ImageView dr0;
ImageView dr1;
ImageView dr2;
ImageView dr3;
ImageView dr4;
ImageView dr5;
ImageView dr6;
ImageView dr7;
ImageView dr8;
ImageView dr9;
SharedPreferences sharedpreferences;
public static final String MyPREFERENCES = "MyPrefs";
public static final String Count = "Count";
public static final String Screen = "Screen";
int cnt = 0;
String screen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_screen);
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
if ( sharedpreferences.contains(Count)) {
cnt = sharedpreferences.getInt(Count, 0);
}
screen = "";
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(Screen,screen);
editor.commit();
dr0=(GifImageView) findViewById(R.id.d0);
dr1=(GifImageView) findViewById(R.id.d1);
dr2=(GifImageView) findViewById(R.id.d2);
dr3=(GifImageView) findViewById(R.id.d3);
dr4=(GifImageView) findViewById(R.id.d4);
dr5=(GifImageView) findViewById(R.id.d5);
dr6=(GifImageView) findViewById(R.id.d6);
dr7=(GifImageView) findViewById(R.id.d7);
dr8=(GifImageView) findViewById(R.id.d8);
dr9=(GifImageView) findViewById(R.id.d9);
btnAutoEmotionCrush = (Button) findViewById(R.id.btnAutoCrush);
btnEmotionVictory = (Button) findViewById(R.id.btnEmotionVictory);
btnSolve = (Button) findViewById(R.id.btnSolve);
btnFlow = (Button) findViewById(R.id.btnFlow);
btnMediate = (Button) findViewById(R.id.btnMediate);
btnExercise = (Button) findViewById(R.id.btnExercise);
btnTestScreen2 = (Button) findViewById(R.id.Test2);
btnAutoEmotionCrush.setOnClickListener(this);
btnEmotionVictory.setOnClickListener(this);
btnSolve.setOnClickListener(this);
btnFlow.setOnClickListener(this);
btnMediate.setOnClickListener(this);
btnExercise.setOnClickListener(this);
btnTestScreen2.setOnClickListener(this);
convertToImg(cnt);
}
@Override
public void onClick(View v) {
if ( v == btnAutoEmotionCrush ) {
Intent i = new Intent(this, com.example.warrenedy.julyfinal.ui.AllEmotionsActivity.class);
startActivity(i);
}
if ( v == btnEmotionVictory ) {
Intent i = new Intent(this, Screen141_Emotion_Selection.class);
startActivity(i);
}
else if ( v == btnSolve ) {
Intent i = new Intent(this, Screen0_Problem_Solver.class);
startActivity(i);
}
else if ( v == btnFlow ) {
Intent i = new Intent(this, Screen5_Flows_Of_Life.class);
startActivity(i);
}
else if ( v == btnMediate ) {
}
else if ( v == btnExercise ) {
}
else if ( v == btnTestScreen2 ) {
Intent i = new Intent(this, TestScreen2.class);
startActivity(i);
}
}
public void convertToImg(Integer cnt)
{
int a = cnt;
int num=0;
int digit=0;
while (a>=1)
{
num=a%10;
a=a/10;
switch(num)
{
case 0:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_0_500_clr_624);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_0_500_clr_624);
break;
case 1:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_1_500_clr_625);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_1_500_clr_625);
break;
case 2:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_2_500_clr_654);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_2_500_clr_654);
break;
case 3:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_3_500_clr_648);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_3_500_clr_648);
break;
case 4:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_4_500_clr_650);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_4_500_clr_650);
break;
case 5:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_5_500_clr_643);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_5_500_clr_643);
break;
case 6:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_6_500_clr_630);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_6_500_clr_630);
break;
case 7:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_7_500_clr_615);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_7_500_clr_615);
break;
case 8:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_8_500_clr_647);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_8_500_clr_647);
break;
case 9:
if(digit==0)
dr0.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==1)
dr1.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==2)
dr2.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==3)
dr3.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==4)
dr4.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==5)
dr5.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==6)
dr6.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==7)
dr7.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==8)
dr8.setImageResource(R.drawable.gold_streak_9_500_clr_617);
if(digit==9)
dr9.setImageResource(R.drawable.gold_streak_9_500_clr_617);
break;
default:
Toast.makeText(this,"error", Toast.LENGTH_SHORT).show();
}
digit++;
}
}
public void onResume(){
if (sharedpreferences.contains(Count)) {
cnt = sharedpreferences.getInt(Count, 0);
}
super.onResume();
}
}
SharedPreference保存在应用程序数据文件夹的xml文件中，这意味着它取决于应用程序数据的状态，重新安装应用程序意味着清除数据，更新不应该删除数据，除非开发人员希望更新。您可以提供完整的示例以更好地理解。