为什么每次我重新打开 Main activity 时我的变量都被重置为零
Why are my variables being reset to zero every time I reopen my Main activity
我目前正在为一个大学项目创建一个应用程序。在该应用程序中，我使用了两个 php 脚本 - 一个用于将应用程序中的变量数据设置为 MySQL 数据库，另一个用于从数据库中检索数据并在应用程序中设置变量。将数据发送到 mySQL 的第一个脚本工作正常，没有任何问题，但是从 mySQL 检索数据以在应用程序内设置变量的脚本仅在 运行 通过我的网络服务器。当 运行 在我的应用程序中（在 Activity 启动和创建时），变量都设置为零。任何帮助都会很棒，我被困了几个星期！
<?php
require "conn.php";
$username = "test";
$stmt = $conn->prepare("SELECT gold, goldMulti, xp, xpMulti, xpMax, xpMaxMulti, dmg, dmgMulti, bossCount, bossHp, bossHpMulti, level, backgroundCount FROM users WHERE username = '$username'");
$stmt ->execute();
$stmt ->bind_result($gold, $goldMulti, $xp, $xpMulti, $xpMax, $xpMaxMulti, $dmg, $dmgMulti, $bossCount, $bossHp, $bossHpMulti, $level, $backgroundCount);
$varaibles = array();
$stmt ->fetch();
$temp = array();
$temp['gold'] = $gold;
$temp['goldMulti'] = $goldMulti;
$temp['xp'] = $xp;
$temp['xpMulti'] = $xpMulti;
$temp['xpMax'] = $xpMax;
$temp['xpMaxMulti'] = $xpMaxMulti;
$temp['dmg'] = $dmg;
$temp['dmgMulti'] = $dmgMulti;
$temp['bossCount'] = $bossCount;
$temp['bossHp'] = $bossHp;
$temp['bossHpMulti'] = $bossHpMulti;
$temp['level'] = $level;
$temp['backgroundCount'] = $backgroundCount;
array_push($variables,$temp);
echo json_encode($temp);
?>
public class MainActivity extends AppCompatActivity {
// int variables for logic and functions ------------------------------------------------------
public int gold;
public int goldAwarded;
public int goldMultiplier;
public int xp;
public int xpAwarded;
public int xpMultiplier;
public int dmg;
public int dmgMultiplier;
public int bossCount;
public int bossHP;
public int bossHPMultiplier;
public int bossHPBase;
public int level;
public int xpMax;
public int bossCountFunc;
public int backgroundCount;
public int xpMaxMulti;
public int baseDmg;
// Widget variables -----------------------------------------------------------------------------
private TextView bossNumberText;
private TextView levelText;
private TextView goldText;
private TextView bossHealthText;
private ImageButton tapButton;
private ImageView bossImage;
private ImageView playerImage;
private ImageView bossImage2;
private ImageView bossImage3;
private ImageButton shopButton;
public String LoggedInUser = LogIn.getUser();
// Audio players --------------------------------------------------------------------------------
MediaPlayer mps;
MediaPlayer mpb;
MediaPlayer mpc;
MediaPlayer mpl;
MediaPlayer mpp;
// Websever php file URL to retrieve Data from user ----------------------------------------------
private static final String URL = "http://jg1104.brighton.domains/AppPhp/variablesretrieval.php";
private void getData(){
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try{
JSONArray array = new JSONArray(response);
for(int i = 0; i<array.length(); i++){
JSONObject object = array.getJSONObject(i);
gold = object.getInt("gold");
goldMultiplier = object.getInt("goldMulti");
xp = object.getInt("xp");
xpMultiplier = object.getInt("xpMulti");
xpMax = object.getInt("xpMax");
xpMaxMulti = object.getInt("xpMaxMulti");
dmg = object.getInt("dmg");
dmgMultiplier = object.getInt("dmgMulti");
bossCount = object.getInt("bossCount");
bossHP = object.getInt("bossHp");
bossHPMultiplier = object.getInt("bossHpMulti");
level = object.getInt("level");
backgroundCount = object.getInt("backgroundCount");
}
}catch (Exception e) {
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this,error.toString(), Toast.LENGTH_SHORT).show();
}
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String, String> param = new HashMap<>();
param.put("LoggedInUser", LoggedInUser);
return param;
}
}
);
Volley.newRequestQueue(MainActivity.this).add(stringRequest);
}
// On create -------------------------------------------------------------------------------------
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bossNumberText = (TextView) findViewById(R.id.bossNumberText);
levelText = (TextView) findViewById(R.id.levelText);
goldText = (TextView) findViewById(R.id.goldText);
bossHealthText = (TextView) findViewById(R.id.bossHealthText);
tapButton = (ImageButton) findViewById(R.id.TapButton);
bossImage = (ImageView) findViewById(R.id.bossImage);
playerImage = (ImageView) findViewById(R.id.playerImage);
bossImage2 = (ImageView) findViewById(R.id.bossImage2);
bossImage3 = (ImageView) findViewById(R.id.bossImage3);
shopButton = (ImageButton) findViewById(R.id.shopButton);
mpb = MediaPlayer.create(this, R.raw.backgroundmusic);
mpc = MediaPlayer.create(this, R.raw.coin);
mpl = MediaPlayer.create(this, R.raw.levelup);
mpp = MediaPlayer.create(this, R.raw.pain);
mps = MediaPlayer.create(this, R.raw.shootingsound);
// retrieving data from database and setting TextViews -----------------------------------
getData();
// Set looping and start of background music ---------------------------------------------
mpb.setLooping(true);
mpb.start();
// Initialising variable values on create ------------------------------------------------
goldAwarded = 100;
xpAwarded = 100;
baseDmg = 1;
bossHPBase = 10;
bossCountFunc = 1;
shopButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
launchShop();
}
});
}
@Override
protected void onStart() {
// onclickListener for main button --------------------------------------------------------
super.onStart();
getData();
levelText.setText("Level: " + Integer.toString(level));
goldText.setText("Gold: " + Integer.toString(gold));
bossHealthText.setText("HP: " + Integer.toString(bossHP));
bossNumberText.setText("Boss: " + bossCount);
tapButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// shooting sound
mps.start();
// run method that looks to see if background needs to be changed
newBackground();
// handlers for enemy animations
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
bossImage.setImageDrawable(getResources().getDrawable(R.drawable.onezshot));
AnimationDrawable oneshotz = (AnimationDrawable) bossImage.getDrawable();
oneshotz.start();
}
}, 0);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
bossImage2.setImageDrawable(getResources().getDrawable(R.drawable.twozshot));
AnimationDrawable twozshot = (AnimationDrawable) bossImage2.getDrawable();
twozshot.start();
}
}, 0);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
bossImage3.setImageDrawable(getResources().getDrawable(R.drawable.threezshot));
AnimationDrawable threezshot = (AnimationDrawable) bossImage3.getDrawable();
threezshot.start();
}
}, 0);
// handler for shooting animation
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
playerImage.setImageDrawable(getResources().getDrawable(R.drawable.shooting));
AnimationDrawable shooting = (AnimationDrawable) playerImage.getDrawable();
shooting.start();
}
}, 0);
bossHP -= dmg;
bossHealthText.setText("HP: " + Integer.toString(bossHP));
// if boss dies
if (bossHP <= 1) {
mpp.start();
bossCount++;
bossCountFunc++;
backgroundCount++;
if (backgroundCount > 9) {
backgroundCount = 1;
}
if (bossCountFunc > 3) {
bossCountFunc = 1;
}
bossNumberText.setText("Boss: " + bossCount);
goldMultiplier++;
xpMultiplier++;
mpc.start();
gold += (goldAwarded * goldMultiplier);
goldText.setText("Gold: " + Integer.toString(gold));
xp += (xpAwarded * xpMultiplier);
bossHPMultiplier++;
// look for level up
if (xp >= xpMax) {
mpl.start();
level++;
dmgMultiplier++;
bossHPMultiplier *= 2;
dmg = (baseDmg * dmgMultiplier);
levelText.setText("lvl: " + Integer.toString(level));
xp = 0;
xpMax = xpMax * xpMaxMulti;
}
newBoss();
}
}
});
}
// Method to show or hide boss frames
public void newBoss(){
bossHP = bossHPBase * bossHPMultiplier;
if(bossCountFunc==1){
bossImage.setVisibility(View.VISIBLE);
bossImage2.setVisibility(View.INVISIBLE);
bossImage3.setVisibility(View.INVISIBLE);
}
if(bossCountFunc==2){
bossImage.setVisibility(View.INVISIBLE);
bossImage2.setVisibility(View.VISIBLE);
}
if(bossCountFunc==3){
bossImage2.setVisibility(View.INVISIBLE);
bossImage3.setVisibility(View.VISIBLE);
}
}
// method to check and change background
public void newBackground(){
ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.constraintLayout);
if(backgroundCount<=3){
layout.setBackgroundResource(R.drawable.main);
}
if(backgroundCount>3 && backgroundCount<=6){
layout.setBackgroundResource(R.drawable.maintwo);
}
if(backgroundCount>6 && backgroundCount<=9){
layout.setBackgroundResource(R.drawable.mainthree);
}
}
public void launchShop(){
Intent intent = new Intent(this, Shop.class);
startActivity(intent);
}
private void setData(final String LoggedInUser, final int gold,final int goldMultiplier,final int xp,final int xpMultiplier
,final int xpMax,final int xpMaxMulti,final int dmg
,final int dmgMultiplier,final int bossCount,final int bossHP
,final int bossHPMultiplier,final int level,final int backgroundCount){
final ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setCancelable(false);
progressDialog.setIndeterminate(false);
progressDialog.setTitle("Setting Data");
progressDialog.show();
String uRl = "http://jg1104.brighton.domains/AppPhp/setdata.php";
StringRequest request = new StringRequest(Request.Method.POST, uRl, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if(response.equals("Data set")){
progressDialog.dismiss();
Toast.makeText(MainActivity.this, response, Toast.LENGTH_SHORT).show();
}
else{
progressDialog.dismiss();
Toast.makeText(MainActivity.this, response, Toast.LENGTH_SHORT).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
Toast.makeText(MainActivity.this, error.toString(), Toast.LENGTH_SHORT).show();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String, String> param = new HashMap<>();
param.put("LoggedInUser", LoggedInUser);
param.put("gold", Integer.toString(gold));
param.put("goldMulti", Integer.toString(goldMultiplier));
param.put("xp", Integer.toString(xp));
param.put("xpMulti", Integer.toString(xpMultiplier));
param.put("xpMax", Integer.toString(xpMax));
param.put("xpMaxMulti", Integer.toString(xpMaxMulti));
param.put("dmg", Integer.toString(dmg));
param.put("dmgMulti", Integer.toString(dmgMultiplier));
param.put("bossCount", Integer.toString(bossCount));
param.put("bossHp", Integer.toString(bossHP));
param.put("bossHpMulti", Integer.toString(bossHPMultiplier));
param.put("level", Integer.toString(level));
param.put("backgroundCount", Integer.toString(backgroundCount));
return param;
}
};
request.setRetryPolicy(new DefaultRetryPolicy(30000,DefaultRetryPolicy.DEFAULT_MAX_RETRIES,DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
MySingleton.getmInstance(MainActivity.this).addToRequestQueue(request);
}
@Override
protected void onStop() {
super.onStop();
setData(LoggedInUser,gold,goldMultiplier,xp,xpMultiplier,xpMax,xpMaxMulti,dmg,dmgMultiplier,bossCount,bossHP,bossHPMultiplier,level,backgroundCount);
}
}
由于脚本在我的网络服务器中使用时可以正常工作，我确定这与我的 java 编码有关。
这段代码是你的问题：
try{
JSONArray array = new JSONArray(response);
for(int i = 0; i<array.length(); i++){
JSONObject object = array.getJSONObject(i);
gold = object.getInt("gold");
goldMultiplier = object.getInt("goldMulti");
xp = object.getInt("xp");
xpMultiplier = object.getInt("xpMulti");
xpMax = object.getInt("xpMax");
xpMaxMulti = object.getInt("xpMaxMulti");
dmg = object.getInt("dmg");
dmgMultiplier = object.getInt("dmgMulti");
bossCount = object.getInt("bossCount");
bossHP = object.getInt("bossHp");
bossHPMultiplier = object.getInt("bossHpMulti");
level = object.getInt("level");
backgroundCount = object.getInt("backgroundCount");
}
} catch (Exception e) {
}
您不应将 catch 块留空。很可能是 throwing and swallowing 错误。
这样做：
} catch (Exception e) {
Log.e("MyApp", "Error parsing!", e);
}
（一些关于 Logcat https://developer.android.com/studio/debug/am-logcat 的阅读）
或者一起摆脱 try catch 让你的应用程序崩溃（快速失败）！！
你的实际错误（或者我能看到的第一个错误）是当你的服务器端响应是一个 JSONObject 时你试图解析一个 JSONarray。这行代码：
JSONArray array = new JSONArray(response);
而这个回应：
{
"gold":600, "goldMulti":3,
"xp":0, "xpMulti":3, "xpMax":0, "xpMaxMulti":0,
"dmg":3,"dmgMulti":3,
"bossCount":3,
"bossHp":80,
"bossHpMulti":14,
"level":3,
"backgroundCount":3
}
（来自这里）http://jg1104.brighton.domains/AppPhp/variablesretrieval.php
您应该将其解析为 JsonObject 或将服务器端返回的响应包装在数组 [].
中
我目前正在为一个大学项目创建一个应用程序。在该应用程序中，我使用了两个 php 脚本 - 一个用于将应用程序中的变量数据设置为 MySQL 数据库，另一个用于从数据库中检索数据并在应用程序中设置变量。将数据发送到 mySQL 的第一个脚本工作正常，没有任何问题，但是从 mySQL 检索数据以在应用程序内设置变量的脚本仅在 运行 通过我的网络服务器。当 运行 在我的应用程序中（在 Activity 启动和创建时），变量都设置为零。任何帮助都会很棒，我被困了几个星期！
<?php
require "conn.php";
$username = "test";
$stmt = $conn->prepare("SELECT gold, goldMulti, xp, xpMulti, xpMax, xpMaxMulti, dmg, dmgMulti, bossCount, bossHp, bossHpMulti, level, backgroundCount FROM users WHERE username = '$username'");
$stmt ->execute();
$stmt ->bind_result($gold, $goldMulti, $xp, $xpMulti, $xpMax, $xpMaxMulti, $dmg, $dmgMulti, $bossCount, $bossHp, $bossHpMulti, $level, $backgroundCount);
$varaibles = array();
$stmt ->fetch();
$temp = array();
$temp['gold'] = $gold;
$temp['goldMulti'] = $goldMulti;
$temp['xp'] = $xp;
$temp['xpMulti'] = $xpMulti;
$temp['xpMax'] = $xpMax;
$temp['xpMaxMulti'] = $xpMaxMulti;
$temp['dmg'] = $dmg;
$temp['dmgMulti'] = $dmgMulti;
$temp['bossCount'] = $bossCount;
$temp['bossHp'] = $bossHp;
$temp['bossHpMulti'] = $bossHpMulti;
$temp['level'] = $level;
$temp['backgroundCount'] = $backgroundCount;
array_push($variables,$temp);
echo json_encode($temp);
?>
public class MainActivity extends AppCompatActivity {
// int variables for logic and functions ------------------------------------------------------
public int gold;
public int goldAwarded;
public int goldMultiplier;
public int xp;
public int xpAwarded;
public int xpMultiplier;
public int dmg;
public int dmgMultiplier;
public int bossCount;
public int bossHP;
public int bossHPMultiplier;
public int bossHPBase;
public int level;
public int xpMax;
public int bossCountFunc;
public int backgroundCount;
public int xpMaxMulti;
public int baseDmg;
// Widget variables -----------------------------------------------------------------------------
private TextView bossNumberText;
private TextView levelText;
private TextView goldText;
private TextView bossHealthText;
private ImageButton tapButton;
private ImageView bossImage;
private ImageView playerImage;
private ImageView bossImage2;
private ImageView bossImage3;
private ImageButton shopButton;
public String LoggedInUser = LogIn.getUser();
// Audio players --------------------------------------------------------------------------------
MediaPlayer mps;
MediaPlayer mpb;
MediaPlayer mpc;
MediaPlayer mpl;
MediaPlayer mpp;
// Websever php file URL to retrieve Data from user ----------------------------------------------
private static final String URL = "http://jg1104.brighton.domains/AppPhp/variablesretrieval.php";
private void getData(){
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try{
JSONArray array = new JSONArray(response);
for(int i = 0; i<array.length(); i++){
JSONObject object = array.getJSONObject(i);
gold = object.getInt("gold");
goldMultiplier = object.getInt("goldMulti");
xp = object.getInt("xp");
xpMultiplier = object.getInt("xpMulti");
xpMax = object.getInt("xpMax");
xpMaxMulti = object.getInt("xpMaxMulti");
dmg = object.getInt("dmg");
dmgMultiplier = object.getInt("dmgMulti");
bossCount = object.getInt("bossCount");
bossHP = object.getInt("bossHp");
bossHPMultiplier = object.getInt("bossHpMulti");
level = object.getInt("level");
backgroundCount = object.getInt("backgroundCount");
}
}catch (Exception e) {
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this,error.toString(), Toast.LENGTH_SHORT).show();
}
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String, String> param = new HashMap<>();
param.put("LoggedInUser", LoggedInUser);
return param;
}
}
);
Volley.newRequestQueue(MainActivity.this).add(stringRequest);
}
// On create -------------------------------------------------------------------------------------
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bossNumberText = (TextView) findViewById(R.id.bossNumberText);
levelText = (TextView) findViewById(R.id.levelText);
goldText = (TextView) findViewById(R.id.goldText);
bossHealthText = (TextView) findViewById(R.id.bossHealthText);
tapButton = (ImageButton) findViewById(R.id.TapButton);
bossImage = (ImageView) findViewById(R.id.bossImage);
playerImage = (ImageView) findViewById(R.id.playerImage);
bossImage2 = (ImageView) findViewById(R.id.bossImage2);
bossImage3 = (ImageView) findViewById(R.id.bossImage3);
shopButton = (ImageButton) findViewById(R.id.shopButton);
mpb = MediaPlayer.create(this, R.raw.backgroundmusic);
mpc = MediaPlayer.create(this, R.raw.coin);
mpl = MediaPlayer.create(this, R.raw.levelup);
mpp = MediaPlayer.create(this, R.raw.pain);
mps = MediaPlayer.create(this, R.raw.shootingsound);
// retrieving data from database and setting TextViews -----------------------------------
getData();
// Set looping and start of background music ---------------------------------------------
mpb.setLooping(true);
mpb.start();
// Initialising variable values on create ------------------------------------------------
goldAwarded = 100;
xpAwarded = 100;
baseDmg = 1;
bossHPBase = 10;
bossCountFunc = 1;
shopButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
launchShop();
}
});
}
@Override
protected void onStart() {
// onclickListener for main button --------------------------------------------------------
super.onStart();
getData();
levelText.setText("Level: " + Integer.toString(level));
goldText.setText("Gold: " + Integer.toString(gold));
bossHealthText.setText("HP: " + Integer.toString(bossHP));
bossNumberText.setText("Boss: " + bossCount);
tapButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// shooting sound
mps.start();
// run method that looks to see if background needs to be changed
newBackground();
// handlers for enemy animations
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
bossImage.setImageDrawable(getResources().getDrawable(R.drawable.onezshot));
AnimationDrawable oneshotz = (AnimationDrawable) bossImage.getDrawable();
oneshotz.start();
}
}, 0);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
bossImage2.setImageDrawable(getResources().getDrawable(R.drawable.twozshot));
AnimationDrawable twozshot = (AnimationDrawable) bossImage2.getDrawable();
twozshot.start();
}
}, 0);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
bossImage3.setImageDrawable(getResources().getDrawable(R.drawable.threezshot));
AnimationDrawable threezshot = (AnimationDrawable) bossImage3.getDrawable();
threezshot.start();
}
}, 0);
// handler for shooting animation
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
playerImage.setImageDrawable(getResources().getDrawable(R.drawable.shooting));
AnimationDrawable shooting = (AnimationDrawable) playerImage.getDrawable();
shooting.start();
}
}, 0);
bossHP -= dmg;
bossHealthText.setText("HP: " + Integer.toString(bossHP));
// if boss dies
if (bossHP <= 1) {
mpp.start();
bossCount++;
bossCountFunc++;
backgroundCount++;
if (backgroundCount > 9) {
backgroundCount = 1;
}
if (bossCountFunc > 3) {
bossCountFunc = 1;
}
bossNumberText.setText("Boss: " + bossCount);
goldMultiplier++;
xpMultiplier++;
mpc.start();
gold += (goldAwarded * goldMultiplier);
goldText.setText("Gold: " + Integer.toString(gold));
xp += (xpAwarded * xpMultiplier);
bossHPMultiplier++;
// look for level up
if (xp >= xpMax) {
mpl.start();
level++;
dmgMultiplier++;
bossHPMultiplier *= 2;
dmg = (baseDmg * dmgMultiplier);
levelText.setText("lvl: " + Integer.toString(level));
xp = 0;
xpMax = xpMax * xpMaxMulti;
}
newBoss();
}
}
});
}
// Method to show or hide boss frames
public void newBoss(){
bossHP = bossHPBase * bossHPMultiplier;
if(bossCountFunc==1){
bossImage.setVisibility(View.VISIBLE);
bossImage2.setVisibility(View.INVISIBLE);
bossImage3.setVisibility(View.INVISIBLE);
}
if(bossCountFunc==2){
bossImage.setVisibility(View.INVISIBLE);
bossImage2.setVisibility(View.VISIBLE);
}
if(bossCountFunc==3){
bossImage2.setVisibility(View.INVISIBLE);
bossImage3.setVisibility(View.VISIBLE);
}
}
// method to check and change background
public void newBackground(){
ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.constraintLayout);
if(backgroundCount<=3){
layout.setBackgroundResource(R.drawable.main);
}
if(backgroundCount>3 && backgroundCount<=6){
layout.setBackgroundResource(R.drawable.maintwo);
}
if(backgroundCount>6 && backgroundCount<=9){
layout.setBackgroundResource(R.drawable.mainthree);
}
}
public void launchShop(){
Intent intent = new Intent(this, Shop.class);
startActivity(intent);
}
private void setData(final String LoggedInUser, final int gold,final int goldMultiplier,final int xp,final int xpMultiplier
,final int xpMax,final int xpMaxMulti,final int dmg
,final int dmgMultiplier,final int bossCount,final int bossHP
,final int bossHPMultiplier,final int level,final int backgroundCount){
final ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setCancelable(false);
progressDialog.setIndeterminate(false);
progressDialog.setTitle("Setting Data");
progressDialog.show();
String uRl = "http://jg1104.brighton.domains/AppPhp/setdata.php";
StringRequest request = new StringRequest(Request.Method.POST, uRl, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if(response.equals("Data set")){
progressDialog.dismiss();
Toast.makeText(MainActivity.this, response, Toast.LENGTH_SHORT).show();
}
else{
progressDialog.dismiss();
Toast.makeText(MainActivity.this, response, Toast.LENGTH_SHORT).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
Toast.makeText(MainActivity.this, error.toString(), Toast.LENGTH_SHORT).show();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String, String> param = new HashMap<>();
param.put("LoggedInUser", LoggedInUser);
param.put("gold", Integer.toString(gold));
param.put("goldMulti", Integer.toString(goldMultiplier));
param.put("xp", Integer.toString(xp));
param.put("xpMulti", Integer.toString(xpMultiplier));
param.put("xpMax", Integer.toString(xpMax));
param.put("xpMaxMulti", Integer.toString(xpMaxMulti));
param.put("dmg", Integer.toString(dmg));
param.put("dmgMulti", Integer.toString(dmgMultiplier));
param.put("bossCount", Integer.toString(bossCount));
param.put("bossHp", Integer.toString(bossHP));
param.put("bossHpMulti", Integer.toString(bossHPMultiplier));
param.put("level", Integer.toString(level));
param.put("backgroundCount", Integer.toString(backgroundCount));
return param;
}
};
request.setRetryPolicy(new DefaultRetryPolicy(30000,DefaultRetryPolicy.DEFAULT_MAX_RETRIES,DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
MySingleton.getmInstance(MainActivity.this).addToRequestQueue(request);
}
@Override
protected void onStop() {
super.onStop();
setData(LoggedInUser,gold,goldMultiplier,xp,xpMultiplier,xpMax,xpMaxMulti,dmg,dmgMultiplier,bossCount,bossHP,bossHPMultiplier,level,backgroundCount);
}
}
由于脚本在我的网络服务器中使用时可以正常工作，我确定这与我的 java 编码有关。
这段代码是你的问题：
try{
JSONArray array = new JSONArray(response);
for(int i = 0; i<array.length(); i++){
JSONObject object = array.getJSONObject(i);
gold = object.getInt("gold");
goldMultiplier = object.getInt("goldMulti");
xp = object.getInt("xp");
xpMultiplier = object.getInt("xpMulti");
xpMax = object.getInt("xpMax");
xpMaxMulti = object.getInt("xpMaxMulti");
dmg = object.getInt("dmg");
dmgMultiplier = object.getInt("dmgMulti");
bossCount = object.getInt("bossCount");
bossHP = object.getInt("bossHp");
bossHPMultiplier = object.getInt("bossHpMulti");
level = object.getInt("level");
backgroundCount = object.getInt("backgroundCount");
}
} catch (Exception e) {
}
您不应将 catch 块留空。很可能是 throwing and swallowing 错误。
这样做：
} catch (Exception e) {
Log.e("MyApp", "Error parsing!", e);
}
（一些关于 Logcat https://developer.android.com/studio/debug/am-logcat 的阅读） 或者一起摆脱 try catch 让你的应用程序崩溃（快速失败）！！
你的实际错误（或者我能看到的第一个错误）是当你的服务器端响应是一个 JSONObject 时你试图解析一个 JSONarray。这行代码：
JSONArray array = new JSONArray(response);
而这个回应：
{
"gold":600, "goldMulti":3,
"xp":0, "xpMulti":3, "xpMax":0, "xpMaxMulti":0,
"dmg":3,"dmgMulti":3,
"bossCount":3,
"bossHp":80,
"bossHpMulti":14,
"level":3,
"backgroundCount":3
}
（来自这里）http://jg1104.brighton.domains/AppPhp/variablesretrieval.php
您应该将其解析为 JsonObject 或将服务器端返回的响应包装在数组 [].