我差不多完成了我的应用程序而且我一直试图解决这个问题。我做了一个活动，显示使用FirestoreRecyclerAdapter从Firestore获取的数据，并且在我的模拟器上运行时效果很好。但是在我使用minifyEnabled:true生成已签名的APK并在我的设备上安装后，RecyclerView只显示空白。当我设置minifyEnabled:false时它完美无缺。以下是我的代码
对于TransactionRecycler类
public class TransactionRecycler {
private String payment_date;
private String status;
private String meternumber;
public String reference;
private String amount_formatted;
private Double PurchasedUnits;
private Double FreeUnits;
private Double Vat;
public String id;
private String payment_time;
// public String state;
private String token;
public String address;
private String account_name;
public TransactionRecycler(String payment_date, String status, String meternumber, String reference, String id, String amount_formatted, String payment_time, String token, Double PurchasedUnits,
Double FreeUnits, Double Vat, String account_name, String address){
this.payment_date = payment_date;
this.status = status;
this.meternumber = meternumber;
this.reference = reference;
this.amount_formatted = amount_formatted;
this.PurchasedUnits = PurchasedUnits;
this.Vat = Vat;
// this.state = state;
this.FreeUnits = FreeUnits;
this.id = id;
this.payment_time = payment_time;
this.token = token;
this.account_name = account_name;
this.address = address;
}
public TransactionRecycler(){};
public void setDate(String payment_date){this.payment_date = payment_date;}
public void setId(String id){this.id =id;}
// public void setState(String id){this.state =state;}
public String getPayment_date(){return payment_date;}
public String getStatus(){return status;}
public String getMeternumber(){return meternumber;}
public String getReference(){return reference;}
public String getAddress(){return address;}
public String getAmount_formatted(){return amount_formatted;}
public Double getPurchasedUnits(){return PurchasedUnits;}
public Double getFreeUnits(){return FreeUnits;}
public Double getVat(){return Vat;}
public String getId(){return id;}
// public String getstate(){return state;}
public String getPayment_time(){return payment_time;}
public String getToken(){return token;}
public String getAccount_name(){return account_name;}
}
对于TRansactionActivity
public class TransactionActivity extends AppCompatActivity {
private static final String TAG = "TransactionActivity";
private final static String strUrlId= "https://www.eliminateramp.com?exmen=";
private static final int SERVICE_CHARGE = 100;
private static final String PLEASE_CHECK_YOUR_METER_NUMBER_AND_TRY_AGAIN = "Please check your meter number and try again";
private static final String COULDN_T_CONNECT_AT_THIS_TIME_PLEASE_TRY_AGAIN = "Couldn't connect at this time, Please try again";
private static final String FAILLED = "failled";
private static final String NOT_FOUND = "NOT FOUND";
private FirebaseAuth mAuth;
private String userID;
private RecyclerView mTransactionList;
protected LinearLayoutManager linearLayoutManager;
public FirestoreRecyclerAdapter adapter;
private SlidingUpPanelLayout mLayout;
private NavigationView navigation;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
private static final String SPACE = " ";
private static String phone;
private Button charname;
private TextView emailview;
private TextView fullnameview;
private TextView priceidrc;
private static TextView post_meterno;
private static String aamount;
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.top_menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_transaction);
mTransactionList = findViewById(R.id.friend_listinc);
mLayout = findViewById(R.id.sliding_layout);
mAuth = FirebaseAuth.getInstance();
userID = mAuth.getCurrentUser().getUid();
Log.d("Error","The UID is: "+userID);
Toolbar mToolbar = findViewById(R.id.nav_actionbar);
setSupportActionBar(mToolbar);
mDrawerLayout = findViewById(R.id.drawerlayout);
navigation = findViewById(R.id.navigationview);
mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.open, R.string.close);
View headerView = navigation.getHeaderView(0);
emailview = headerView.findViewById(R.id.emailviewraw);
fullnameview = headerView.findViewById(R.id.fullnameviewid);
charname = headerView.findViewById(R.id.charnameid);
mDrawerLayout.addDrawerListener(mToggle);
mToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
try{
getUserData();
}catch (Exception e){
Log.d(TAG, "Failed to get user Data at this time coz: "+e);
}
ImageView imgview = findViewById(R.id.closeid);
imgview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mLayout.animate();
mLayout.setPanelState(SlidingUpPanelLayout.PanelState.COLLAPSED);
}
});
charname.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(TransactionActivity.this,UpdateActivity.class));
}
});
init();
inTrans();
initInstances();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return mToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item);
}
private void initInstances() {
// getSupportActionBar().setHomeButtonEnabled(true);
// getSupportActionBar().setDisplayHomeAsUpEnabled(true);
navigation = findViewById(R.id.navigationview);
navigation.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
int id = menuItem.getItemId();
switch (id) {
case R.id.nav_home:
//Do some thing here
// add navigation drawer item onclick method here
Intent intent2 = new Intent(TransactionActivity.this, HomePageActivity.class);
startActivity(intent2);
break;
case R.id.nav_estimate:
mDrawerLayout.closeDrawer(GravityCompat.START);
break;
//Do some thing here
// add navigation drawer item onclick method here
case R.id.nav_Settings:
//Do some thing here
// add navigation drawer item onclick method here
Intent intent3 = new Intent(TransactionActivity.this, HelpActivity.class);
startActivity(intent3);
break;
case R.id.nav_hc:
//Do some thing here
// add navigation drawer item onclick method here
Intent intent = new Intent(TransactionActivity.this, HelpCenterActivity.class);
startActivity(intent);
break;
}
return false;
}
});
}
private void init(){
linearLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false);
mTransactionList.setLayoutManager(linearLayoutManager);
}
private void inTrans(){
Query query = FirebaseFirestore.getInstance().collection("user-orders").document(userID).collection("successful-orders").orderBy("RequestedOn");
FirestoreRecyclerOptions<TransactionRecycler> response = new FirestoreRecyclerOptions.Builder<TransactionRecycler>()
.setQuery(query, TransactionRecycler.class)
.build();
adapter = new FirestoreRecyclerAdapter<TransactionRecycler, TransactionRecyclerHolder>(response){
@Override
public TransactionRecyclerHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.transaction_list, parent, false);
return new TransactionRecyclerHolder(view);
}
@Override
public void onError(@NonNull FirebaseFirestoreException e) {
Log.e("error", e.getMessage());
}
@Override
protected void onBindViewHolder(@NonNull TransactionRecyclerHolder holder, int position, @NonNull final TransactionRecycler model) {
//progressBar.setVisibility(View.GONE);
holder.setDate(model.getPayment_date());
holder.setStatus(model.getStatus());
holder.setReference(model.getId());
holder.setMeterno(model.getMeternumber());
holder.setPrice(model.getAmount_formatted());
mLayout.setFadeOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mLayout.animate();
mLayout.setPanelState(SlidingUpPanelLayout.PanelState.COLLAPSED);
}
});
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mLayout.setPanelHeight(4);
mLayout.animate();
// mLayout.setAnchorPoint(2.0f);
mLayout.setPanelState(SlidingUpPanelLayout.PanelState.EXPANDED);
priceidrc = findViewById(R.id.priceidsc);
TextView dateidrc = findViewById(R.id.dateidsc);
TextView referenceidrc = findViewById(R.id.refidsc);
TextView statusidrc = findViewById(R.id.statusidsc);
TextView meternoidrc = findViewById(R.id.meternoidsc);
TextView paymenttimeidrc = findViewById(R.id.paymenttimeidsc);
TextView tokenidrc = findViewById(R.id.tokenidsc);
TextView creditidrc = findViewById(R.id.creditidsc);
TextView freeunitsrc = findViewById(R.id.freeunitsidsc);
TextView vatrc = findViewById(R.id.vatidsc);
TextView accountnameidrc = findViewById(R.id.namesidsc);
TextView address = findViewById(R.id.addressidsc);
dateidrc.setText(model.getPayment_date());
statusidrc.setText(model.getStatus());
meternoidrc.setText(model.getMeternumber());
priceidrc.setText(model.getAmount_formatted());
referenceidrc.setText(model.getId());
paymenttimeidrc.setText(model.getPayment_time());
tokenidrc.setText(model.getToken());
creditidrc.setText(String.valueOf(model.getPurchasedUnits()));
freeunitsrc.setText(String.valueOf(model.getFreeUnits()));
vatrc.setText(String.valueOf(model.getVat()));
accountnameidrc.setText(model.getAccount_name());
address.setText(model.getAddress());
}
});
}
};
adapter.notifyDataSetChanged();
mTransactionList.setAdapter(adapter);
}
@Override
public void onStart() {
super.onStart();
adapter.startListening();
}
@Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
public static class TransactionRecyclerHolder extends RecyclerView.ViewHolder {
View mView;
TransactionRecyclerHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setDate(String payment_date) {
TextView post_date = mView.findViewById(R.id.dateid);
post_date.setText(payment_date);
}
public void setStatus(String status) {
TextView post_status = mView.findViewById(R.id.statusid);
post_status.setText(status);
}
public void setMeterno(String meterno) {
post_meterno = mView.findViewById(R.id.meternoid);
post_meterno.setText(meterno);
}
public void setReference(String reference) {
TextView post_ref = mView.findViewById(R.id.refid);
post_ref.setText(reference);
}
public void setPrice(String price) {
TextView post_price = mView.findViewById(R.id.priceid);
post_price.setText(price);
aamount=price;
}
}
public void getUserData() {
mAuth= FirebaseAuth.getInstance();
try{
userID = mAuth.getCurrentUser().getUid();
}catch(Exception e){
Log.d(TAG, "Failled somehow");
}
Log.d(TAG, "ur uid => "+userID);
DocumentReference mDocRef = FirebaseFirestore.getInstance().collection("users").document(userID);
mDocRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if(task.isSuccessful()){
DocumentSnapshot doc = task.getResult();
String firstname = doc.get("firstName").toString();
String lastname = doc.get("lastName").toString();
phone = doc.get("phone").toString();
String fullname = firstname+SPACE+lastname;
fullnameview.setText(fullname);
try{
emailview.setText(mAuth.getCurrentUser().getEmail());
}catch(Exception e){
Log.d(TAG,"oops");
}
charname.setText(firstname.substring(0,1));
}
}
});
}
public void buyAgain(View view){
final Dialog dialog = new Dialog(TransactionActivity.this);
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
dialog.setCanceledOnTouchOutside(false);
dialog.setContentView(R.layout.progressbar);
String price = aamount.replaceAll("\\D","");
final int amount = Integer.parseInt(price) + SERVICE_CHARGE;
final String mn = post_meterno.getText().toString();
final String ml = "amstadam";
final String ref = String.valueOf(Calendar.getInstance().getTimeInMillis());
@SuppressLint("StaticFieldLeak") AsyncTask<String, String, String> jesgetnames = new AsyncTask<String, String, String>() {
@Override
protected String doInBackground(String... params) {
String geMtName;
String urlMtName = strUrlId+post_meterno.getText().toString().trim();
Log.d(TAG, "The string:" + urlMtName);
try {
URL url = new URL(urlMtName);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
con.connect();
BufferedReader bf = new BufferedReader(new InputStreamReader(con.getInputStream()));
String value = bf.readLine();
Log.d(TAG, "Value of value is: " + value);
if(value.equals("not found")){
geMtName = "NOT FOUND";
}else{
JSONObject parentJson = new JSONObject(value);
String meternumber = parentJson.getString("xmen");
String metername = parentJson.getString("x_name");
String address = parentJson.getString("address");
geMtName = metername+"/"+meternumber+"/"+address;
}
Log.d(TAG, "meter name after get is: " + geMtName);
} catch (Exception e) {
// Log.d(TAG, "Faiiled coz: "+ e);
geMtName = "failled";
e.printStackTrace();
}
Log.d(TAG, "I dont know if this works " + geMtName);
return geMtName;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.d(TAG, "pnPostExecute value: " + s);
String nameSubString;
String numberSubString;
String addressSubString;
// date and time creation
String stringDate = String.valueOf(DateFormat.getDateTimeInstance());
Date stringTime = Calendar.getInstance().getTime();
SimpleDateFormat curFormater = new SimpleDateFormat("dd/MM/yyyy", Locale.ENGLISH);
SimpleDateFormat timeFormat = new SimpleDateFormat("h:mm a", Locale.ENGLISH);
Date dateObj = new Date();
Date timeObj = new Date();
try {
dateObj = curFormater.parse(stringDate);
timeObj = timeFormat.parse(String.valueOf(stringTime));
} catch (ParseException e) {
e.printStackTrace();
}
SimpleDateFormat postFormater = new SimpleDateFormat("d MMMM yyyy", Locale.ENGLISH);
SimpleDateFormat postTimeFormater = new SimpleDateFormat("h:mm a", Locale.ENGLISH);
String newDateStr = postFormater.format(dateObj);
String newtimeStr = postTimeFormater.format(timeObj);
switch (s) {
case FAILLED:
nameSubString = FAILLED;
numberSubString = FAILLED;
addressSubString = FAILLED;
break;
case NOT_FOUND:
nameSubString = FAILLED;
numberSubString = FAILLED;
addressSubString = FAILLED;
break;
default:
String[] split = s.split("/");
nameSubString = split[0];
numberSubString = split[1];
addressSubString = split[2];
break;
}
switch (s) {
//TODO: Change toast message to reflect Json in future
case FAILLED:
//TODO: after creating layout, go back to previous layout and display toast message
Toast.makeText(TransactionActivity.this, COULDN_T_CONNECT_AT_THIS_TIME_PLEASE_TRY_AGAIN, Toast.LENGTH_SHORT).show();
dialog.dismiss();
break;
case NOT_FOUND:
Toast.makeText(TransactionActivity.this, PLEASE_CHECK_YOUR_METER_NUMBER_AND_TRY_AGAIN, Toast.LENGTH_SHORT).show();
dialog.dismiss();
break;
default:
Intent meterIntent = new Intent(TransactionActivity.this, MeterNumActivity.class);
meterIntent.putExtra("meternum", mn);
meterIntent.putExtra("meterprice", amount);
meterIntent.putExtra("meterlocation", ml);
meterIntent.putExtra("reference", ref);
meterIntent.putExtra("meteracctname", nameSubString);
meterIntent.putExtra("meteracctnumber", numberSubString);
meterIntent.putExtra("meteracctaddress", addressSubString);
meterIntent.putExtra("uuid", userID);
meterIntent.putExtra("date_created", newDateStr);
meterIntent.putExtra("time_created", newtimeStr);
meterIntent.putExtra("phone", phone);
meterIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(meterIntent);
break;
}
}
};
dialog.show();
jesgetnames.execute();
}
@Override
public void onBackPressed() {
Intent i= new Intent(this,HomePageActivity.class);
startActivity(i);
finish();
}
}
我的Gradle是
android {
compileSdkVersion 26
defaultConfig {
applicationId "com.example.menofx.xmen"
minSdkVersion 21
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support:cardview-v7:26.1.0'
implementation 'com.firebaseui:firebase-ui-firestore:3.1.3'
implementation 'com.firebaseui:firebase-ui-auth:3.1.3'
implementation 'com.firebaseui:firebase-ui-database:3.1.3'
implementation "com.google.firebase:firebase-firestore:11.8.0"
implementation "com.android.support:recyclerview-v7:26.1.0"
implementation "com.google.android.gms:play-services-auth:11.8.0"
implementation 'co.paystack.android:paystack:3.0.9'
implementation 'br.com.simplepass:loading-button-android:1.8.4'
implementation 'com.github.faruktoptas:FancyShowCaseView:1.0.0'
implementation 'com.sothree.slidinguppanel:library:3.4.0'
implementation 'com.android.support:design:26.1.0'
implementation 'com.android.support:support-v4:26.1.0'
implementation 'com.android.support:support-vector-drawable:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:0.5'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:2.2.2'
implementation project(':library')
}
apply plugin: 'com.google.gms.google-services'
如果需要，我的proguard规则是空的。这是我第一次使用firebase UI，所以我甚至不知道如何诊断问题。谢谢你的帮助。
答案 0 :(得分：4)
您需要将您的POJO（模型类）放在一个包中，并将该包添加到您的proguard规则中，或者您可以添加这些类所在的所有包（我只是亲自使用单个包）。 Firebase在序列化和反序列化过程中使用反射，因此它不能使用模糊的类名。将所有这些内容放入一个软件包后，将此规则添加到proguard文件中以防止混淆：
-keep class package.to.pojos.** { *; }
如果您希望将它们保留在原来的位置，只需为每个模型类添加一个规则，其中包含-keep class个关键字，后跟该类的完整路径（packagewise）。
答案 1 :(得分：1)
您遇到的问题 当将minifyEnabled设置为true时，R8编译器通过删除不必要的参数，方法和代码的其他部分（R8认为不可用）来优化代码，并缩小类名和其他参数的名称以减小应用程序大小。但是有时R8不能正确确定哪些代码有用，哪些代码没有用。这就是R8也删除有用代码的原因。也许就您而言，R8更改了数据密钥。您可以通过从已签名的应用程序推送不同的数据来找到它。例如，在设置用户个人资料时来自用户的一些输入数据。现在回到您的Firebase Firestore控制台，并检查刚刚推送的数据的键。您会发现密钥现在有所不同。同样，由于R8在尝试获取数据时已更改了调用密钥，因此无法找到该密钥对值。因此，您的回收站视图为空。
解决方案 1.将以下库添加到模块的build.gradle文件中。
implementation 'androidx.annotation:annotation:1.1.0'
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