Question

无法从Firestore数据库中获取值。当flat和block的值与数据库中的条目匹配时，尝试检索手机号码的值。下面是我正在使用的代码。我还附上了LogCat文件中注册的问题。请检查并提供帮助。

    public class Test extends AppCompatActivity {

    Button btn;
    private FirebaseFirestore firestore;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        firestore = FirebaseFirestore.getInstance();
        btn = (Button) findViewById(R.id.button3);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getmobile();
                //makecall();

            }
        });
    }

    private void makecall(){
        Intent intent = new Intent(Intent.ACTION_CALL_BUTTON);
        intent.setData(Uri.parse("tel:9890910640"));
        startActivity(intent);
    }



    private void getmobile() {

        firestore.collection("users").get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
            @Override
            public void onSuccess(QuerySnapshot documentSnapshots) {
                String a = "101";
                String b = "F1A";
                for(DocumentSnapshot document: documentSnapshots){


                    if(document.getString("flat")==a&&document.getString("block")==b){
                        String mobilefromdatabase = document.get("mobile").toString();
                        Toast.makeText(Test.this, "mobile" + mobilefromdatabase, Toast.LENGTH_LONG).show();
                        break;

                    }

                }
            }
        });




    }
}

Logcat详细信息

05-05 03:59:26.721 8805-8805/? E/libprocessgroup: failed to make and chown /acct/uid_10058: Read-only file system
05-05 03:59:26.721 8805-8805/? W/Zygote: createProcessGroup failed, kernel missing CONFIG_CGROUP_CPUACCT?
05-05 03:59:26.722 8805-8805/? I/art: Not late-enabling -Xcheck:jni (already on)
05-05 03:59:26.770 8805-8805/com.example.myrwaapp I/MultiDex: VM with version 2.1.0 has multidex support
05-05 03:59:26.770 8805-8805/com.example.myrwaapp I/MultiDex: Installing application
05-05 03:59:26.770 8805-8805/com.example.myrwaapp I/MultiDex: VM has multidex support, MultiDex support library is disabled.
05-05 03:59:26.842 8805-8805/com.example.myrwaapp V/FA: Registered activity lifecycle callback
05-05 03:59:26.857 8805-8831/com.example.myrwaapp W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
05-05 03:59:26.861 8805-8805/com.example.myrwaapp I/FirebaseInitProvider: FirebaseApp initialization successful
05-05 03:59:26.907 8805-8834/com.example.myrwaapp W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
05-05 03:59:26.925 8805-8834/com.example.myrwaapp I/FirebaseAuth: [FirebaseAuth:] Preparing to create service connection to gms implementation
05-05 03:59:26.986 8805-8805/com.example.myrwaapp W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter androidx.vectordrawable.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
05-05 03:59:27.010 8805-8805/com.example.myrwaapp V/FA: onActivityCreated
05-05 03:59:27.047 8805-8805/com.example.myrwaapp I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$2>
05-05 03:59:27.047 8805-8805/com.example.myrwaapp I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$2>
05-05 03:59:27.048 8805-8830/com.example.myrwaapp V/FA: App measurement collection enabled
05-05 03:59:27.049 8805-8830/com.example.myrwaapp V/FA: App measurement enabled for app package, google app id: com.example.myrwaapp, 1:649640616763:android:9025242f82dd4767798d1e
05-05 03:59:27.052 8805-8830/com.example.myrwaapp I/FA: App measurement initialized, version: 21028
05-05 03:59:27.052 8805-8830/com.example.myrwaapp I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE
05-05 03:59:27.052 8805-8830/com.example.myrwaapp I/FA: To enable faster debug mode event logging run:
      adb shell setprop debug.firebase.analytics.app com.example.myrwaapp
05-05 03:59:27.052 8805-8830/com.example.myrwaapp D/FA: Debug-level message logging enabled
05-05 03:59:27.077 8805-8830/com.example.myrwaapp V/FA: Connecting to remote service
05-05 03:59:27.089 8805-8830/com.example.myrwaapp V/FA: Connection attempt already in progress
05-05 03:59:27.143 8805-8830/com.example.myrwaapp V/FA: Activity resumed, time: 8622127
05-05 03:59:27.145 8805-8830/com.example.myrwaapp I/FA: Tag Manager is not found and thus will not be used
05-05 03:59:27.151 8805-8838/com.example.myrwaapp D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
05-05 03:59:27.154 8805-8805/com.example.myrwaapp D/Atlas: Validating map...
05-05 03:59:27.159 8805-8830/com.example.myrwaapp V/FA: Connection attempt already in progress
05-05 03:59:27.159 8805-8830/com.example.myrwaapp V/FA: Connection attempt already in progress
05-05 03:59:27.188 8805-8838/com.example.myrwaapp I/OpenGLRenderer: Initialized EGL, version 1.4
05-05 03:59:27.188 8805-8838/com.example.myrwaapp W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
05-05 03:59:27.215 8805-8838/com.example.myrwaapp D/EGL_emulation: eglCreateContext: 0xa2003100: maj 2 min 0 rcv 2
05-05 03:59:27.240 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:27.243 8805-8838/com.example.myrwaapp D/OpenGLRenderer: Enabling debug mode 0
05-05 03:59:27.294 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:27.738 8805-8830/com.example.myrwaapp D/FA: Connected to remote service
05-05 03:59:27.738 8805-8830/com.example.myrwaapp V/FA: Processing queued up service tasks: 4
05-05 03:59:32.795 8805-8830/com.example.myrwaapp V/FA: Inactivity, disconnecting from the service
05-05 03:59:38.884 8805-8830/com.example.myrwaapp V/FA: Recording user engagement, ms: 11740
05-05 03:59:38.886 8805-8830/com.example.myrwaapp V/FA: Connecting to remote service
05-05 03:59:38.892 8805-8830/com.example.myrwaapp V/FA: Activity paused, time: 8633867
05-05 03:59:38.894 8805-8805/com.example.myrwaapp V/FA: onActivityCreated
05-05 03:59:38.913 8805-8830/com.example.myrwaapp V/FA: Connection attempt already in progress
05-05 03:59:38.913 8805-8830/com.example.myrwaapp V/FA: Activity resumed, time: 8633895
05-05 03:59:38.926 8805-8830/com.example.myrwaapp V/FA: Connection attempt already in progress
05-05 03:59:38.926 8805-8830/com.example.myrwaapp V/FA: Connection attempt already in progress
05-05 03:59:38.993 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:39.034 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:39.051 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:39.177 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:39.222 8805-8830/com.example.myrwaapp D/FA: Connected to remote service
05-05 03:59:39.222 8805-8830/com.example.myrwaapp V/FA: Processing queued up service tasks: 4
05-05 03:59:39.224 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:39.335 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:44.247 8805-8830/com.example.myrwaapp V/FA: Inactivity, disconnecting from the service
05-05 03:59:48.704 8805-8838/com.example.myrwaapp D/EGL_emulation: eglMakeCurrent: 0xa2003100: ver 2 0 (tinfo 0xb4233e90)
05-05 03:59:48.871 8805-8849/com.example.myrwaapp W/DynamiteModule: Local module descriptor class for providerinstaller not found.
05-05 03:59:48.877 8805-8849/com.example.myrwaapp I/DynamiteModule: Considering local module providerinstaller:0 and remote module providerinstaller:0
05-05 03:59:48.877 8805-8849/com.example.myrwaapp W/ProviderInstaller: Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
05-05 03:59:48.881 8805-8849/com.example.myrwaapp W/ResourcesManager: Asset path '/system/framework/com.android.media.remotedisplay.jar' does not exist or contains no resources.
05-05 03:59:48.881 8805-8849/com.example.myrwaapp W/ResourcesManager: Asset path '/system/framework/com.android.location.provider.jar' does not exist or contains no resources.
05-05 03:59:48.942 8805-8849/com.example.myrwaapp W/linker: libconscrypt_gmscore_jni.so: unused DT entry: type 0x6ffffffe arg 0x13dc
05-05 03:59:48.942 8805-8849/com.example.myrwaapp W/linker: libconscrypt_gmscore_jni.so: unused DT entry: type 0x6fffffff arg 0x2
05-05 03:59:48.948 8805-8849/com.example.myrwaapp V/NativeCrypto: Registering com/google/android/gms/org/conscrypt/NativeCrypto's 284 native methods...
05-05 03:59:48.963 8805-8820/com.example.myrwaapp I/art: Background sticky concurrent mark sweep GC freed 976(49KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 8MB/8MB, paused 5.861ms total 31.265ms
05-05 03:59:48.992 8805-8849/com.example.myrwaapp I/art: Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java7ExtendedSSLSession>
05-05 03:59:48.992 8805-8849/com.example.myrwaapp I/art: Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java7ExtendedSSLSession>
05-05 03:59:48.992 8805-8849/com.example.myrwaapp I/art: Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java8ExtendedSSLSession>
05-05 03:59:48.992 8805-8849/com.example.myrwaapp I/art: Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.org.conscrypt.Java8ExtendedSSLSession>
05-05 03:59:49.002 8805-8849/com.example.myrwaapp I/ProviderInstaller: Installed default security provider GmsCore_OpenSSL

Answer 1

首先，不应使用==运算符来执行Java中的字符串比较，因为它总是会比较内存中对象的地址，而不是实际值。字符串比较应使用equals()方法进行。

此外，如果您需要进行AND操作，则应该不获取users集合中存在的所有文档，并在客户端上进行比较。为此，您应该使用看起来像这样的查询：

String a = "101";
String b = "F1A";
FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference usersRef = rootRef.collection("users");
Query query = usersRef.whereEqualTo("flat", a).whereEqualTo("block", b);
query.get().addOnSuccessListener(/* ... */);

通过这种方式，您将仅获得flat属性具有101值且block值具有F1A的文档。由于我认为只有一间公寓具有该限制，因此您只需要进行一次读操作即可计费。

从Firestore数据库中检索多个文档中的数据

1 个答案: