我有一个应用程序，首先使用firebase登录用户，然后进入mainactivity。最初我没有登录功能，因此应用程序从mainactivity开始。一旦我添加了登录活动，并使用我的手机进行了测试，它就运行得很好。但重新安装应用程序后，它不会从登录活动中打开。它从mainactivity开始并请求权限。 我已对Android清单进行了必要的更改，并确定它是对的。 然而它并没有奏效。 我是初学者，请详细解释任何解决方案。 谢谢！
PS：即时通讯使用谷歌定位服务。 mypp必须请求精确位置，内部存储等权限。 这些权限位于Mainactivity中。 MainActivity和LoginActivity的代码如下：
package com.sitepoint.example02;
import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Build;
import android.os.CountDownTimer;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.io.File;
import android.location.Location;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.firebase.auth.FirebaseAuth;
import static com.sitepoint.example02.R.id.initiate;
import static com.sitepoint.example02.R.id.textView16;
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
private FirebaseAuth auth;
private static final String TAG = "MainActivity";
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private boolean permissionIsGranted = false;
private FusedLocationProviderApi LocationProvider = LocationServices.FusedLocationApi;
private static final int MY_PERMISSIONS_REQUEST_FINE_LOCATION = 101;
private static final int MY_PERMISSIONS_REQUEST_COARSE_LOCATION = 102;
private Uri file;
TextView vv;
String latt;
String longit;
Button b;
int threshld1 = 0;
int threshld = 0;
int skipped = 0;
int locationdata=0;
String close;
int i = 0;
Button myresdone;
private ImageView whitee;
private ImageView logo;
private Button register;
private Button skipbut;
private Button takePictureButton;
private ImageView imageView;
Boolean a;
TextView signout;
TextView txt16;
String useridd="";
//private FirebaseAuth user;
private ProgressBar pbb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//user=FirebaseAuth.getInstance();
auth=FirebaseAuth.getInstance();
pbb=(ProgressBar)findViewById(R.id.progressBar2) ;
signout=(TextView)findViewById(R.id.signout);
signout.setEnabled(false);
signout.setVisibility(View.INVISIBLE);
close = getIntent().getStringExtra("c");
if (close == "c")
finish();
whitee = (ImageView) findViewById(R.id.wholepage);
logo = (ImageView) findViewById(R.id.logo);
takePictureButton = (Button) findViewById(R.id.button_image);
register = (Button) findViewById(R.id.button3);
txt16=(TextView)findViewById(textView16);
myresdone = (Button) findViewById(R.id.button6);
skipbut = (Button) findViewById(R.id.button5);
skipbut.setEnabled(false);
skipbut.setVisibility(View.INVISIBLE);
vv = (TextView) findViewById(R.id.textView);
takePictureButton.setEnabled(false);
register.setEnabled(false);
register.setVisibility(View.INVISIBLE);
takePictureButton.setVisibility(View.INVISIBLE);
vv.setEnabled(false);
myresdone.setVisibility(View.INVISIBLE);
myresdone.setEnabled(false);
//getting user account id
useridd = auth.getCurrentUser().getUid();
vv.setVisibility(View.INVISIBLE);
new CountDownTimer(1000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
/* if (system==null) {
auth.signOut();
register.setVisibility(View.INVISIBLE);
register.setEnabled(false);
initiate.setVisibility(View.VISIBLE);
if (i == 1 && threshld1 != 1 && threshld != 1)
initiate.setEnabled(true);
} else {
useridd = auth.getCurrentUser().getUid();
txt16.setText(useridd);*/
a = fileExistance(useridd + ".txt");
if (!a) {
register.setVisibility(View.VISIBLE);
if(i == 1 && threshld1 != 1 && threshld != 1)
register.setEnabled(true);
} else {
skipbut.setVisibility(View.VISIBLE);
takePictureButton.setVisibility(View.VISIBLE);
myresdone.setVisibility(View.VISIBLE);
pbb.setVisibility(View.VISIBLE);
if (i == 1 && threshld1 != 1 && threshld != 1 && locationdata == 1) {
takePictureButton.setEnabled(true);
skipbut.setEnabled(true);
signout.setEnabled(true);
signout.setVisibility(View.VISIBLE);
myresdone.setEnabled(true);
pbb.setVisibility(View.INVISIBLE);
}
vv.setEnabled(true);
vv.setVisibility(View.VISIBLE);
whitee.setVisibility(View.INVISIBLE);
whitee.setEnabled(false);
logo.setVisibility(View.INVISIBLE);
logo.setEnabled(false);
}
}
}.start();
imageView = (ImageView) findViewById(R.id.imageview);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(5000);
mLocationRequest.setFastestInterval(3000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
myresdone.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(MainActivity.this, myresdone.class);
i.putExtra("useridd",useridd);
startActivity(i);
}
});
signout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
auth.signOut();
startActivity(new Intent(MainActivity.this, LoginActivity.class));
finish();
}
});
register.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent rg = new Intent(MainActivity.this, Main5Activity.class);
rg.putExtra("useridd", useridd);
startActivity(rg);
}
});
skipbut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this, Main2Activity.class);
i.putExtra("latt", latt);
i.putExtra("longit", longit);
skipped = -2;
i.putExtra("useridd", useridd);
i.putExtra("skipped", skipped);
startActivity(i);
finish();
}
});
b = (Button) findViewById(R.id.btnClick);
b.setEnabled(false);
b.setVisibility(b.INVISIBLE);
b.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent i = new Intent(MainActivity.this, Main2Activity.class);
i.putExtra("latt", latt);
i.putExtra("longit", longit);
i.putExtra("useridd", useridd);
startActivity(i);
finish();
}
});
LocationManager_check locationManagerCheck = new LocationManager_check(
this);
Location location = null;
Boolean internet=isOnline();
if (locationManagerCheck.isLocationServiceAvailable()==false && internet==false ) {
//locationManagerCheck.createLocationServiceError(MainActivity.this);
Toast.makeText(MainActivity.this, "Internet and location access unavailable!", Toast.LENGTH_LONG).show();
}
else if(locationManagerCheck.isLocationServiceAvailable()==false && internet==true ) {
//locationManagerCheck.createLocationServiceError(MainActivity.this);
Toast.makeText(MainActivity.this, "location access unavailable!", Toast.LENGTH_LONG).show();
}
else if(locationManagerCheck.isLocationServiceAvailable()==true && internet==false ) {
//locationManagerCheck.createLocationServiceError(MainActivity.this);
Toast.makeText(MainActivity.this, "Internet connection unavailable!", Toast.LENGTH_LONG).show();
}
else if (locationManagerCheck.isLocationServiceAvailable() == true && isOnline()==true) {
i = 1;
}
}
//some required functions
public boolean fileExistance(String fname) {
File file = getBaseContext().getFileStreamPath(fname);
return file.exists();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == 0) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[2] == PackageManager.PERMISSION_GRANTED) {
} else {
register.setEnabled(false);
takePictureButton.setEnabled(false);
skipbut.setEnabled(false);
threshld1 = 1;
}
} else if (requestCode == MY_PERMISSIONS_REQUEST_FINE_LOCATION) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[2] == PackageManager.PERMISSION_GRANTED) {
permissionIsGranted = true;
} else {
permissionIsGranted = false;
Toast.makeText(getApplicationContext(), "This app requires all three permissions to be granted", Toast.LENGTH_SHORT).show();
register.setEnabled(false);
takePictureButton.setEnabled(false);
skipbut.setEnabled(false);
threshld1 = 1;
}
}
}
public void takePicture(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
file = Uri.fromFile(getOutputMediaFile());
intent.putExtra(MediaStore.EXTRA_OUTPUT, file);
startActivityForResult(intent, 100);
}
private static File getOutputMediaFile() {
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "CameraDemo");
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d("CameraDemo", "failed to create directory");
return null;
}
}
return new File(mediaStorageDir.getPath() + File.separator + "hsr.jpg");
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
if (resultCode == RESULT_OK) {
imageView.setImageURI(file);
vv.setVisibility(View.INVISIBLE);
if (i == 1) {
b.setEnabled(true);
b.setVisibility(b.VISIBLE);
takePictureButton.setEnabled(false);
takePictureButton.setVisibility(takePictureButton.INVISIBLE);
skipbut.setEnabled(false);
myresdone.setEnabled(false);
myresdone.setVisibility(View.INVISIBLE);
skipbut.setVisibility(View.INVISIBLE);
}
}
}
}
//Location code
/////////////////////////////////////////////////////////////////////////////////////////
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
protected void onResume() {
super.onResume();
if (permissionIsGranted) {
if (mGoogleApiClient.isConnected()) {
RequestLocationUpdates();
}
}
}
protected void onPause() {
super.onPause();
if (permissionIsGranted)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
@Override
protected void onStop() {
super.onStop();
if (permissionIsGranted)
mGoogleApiClient.disconnect();
}
@Override
public void onConnected(Bundle bundle) {
RequestLocationUpdates();
}
private void RequestLocationUpdates() {
if ((ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) || ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ) {
requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.CAMERA,
Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_FINE_LOCATION);
} else {
permissionIsGranted = true;
}
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
Log.i(TAG, "Connection Suspended");
mGoogleApiClient.connect();
}
@Override
public void onLocationChanged(Location location) {
latt = String.valueOf(location.getLatitude());
longit = String.valueOf(location.getLongitude());
locationdata=1;
if (i == 1 && threshld1 != 1 && threshld != 1 &&locationdata==1) {
takePictureButton.setEnabled(true);
skipbut.setEnabled(true);
myresdone.setEnabled(true);
signout.setEnabled(true);
signout.setVisibility(View.VISIBLE);
pbb.setVisibility(View.INVISIBLE);
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.i(TAG, "Connection failed. Error: " + connectionResult.getErrorCode());
}
public boolean isOnline() {
ConnectivityManager conMgr = (ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = conMgr.getActiveNetworkInfo();
if(netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()){
return false;
}
return true;
}
}
登录活动：
package com.sitepoint.example02;
import android.text.TextUtils;
import android.widget.Toast;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class LoginActivity extends AppCompatActivity {
private EditText inputEmail, inputPassword;
private FirebaseAuth auth;
private ProgressBar progressBar;
private Button btnSignup, btnLogin, btnReset;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Get Firebase auth instance
auth = FirebaseAuth.getInstance();
if (auth.getCurrentUser() != null) {
Intent i=new Intent(LoginActivity.this, MainActivity.class);
startActivity(i);
finish();
}
// the above code checks whether the same person had previously logged in and therefore loads previous profile*********
// set the view now
setContentView(R.layout.activity_login);
// Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
// setSupportActionBar(toolbar);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
btnSignup = (Button) findViewById(R.id.btn_signup);
btnLogin = (Button) findViewById(R.id.btn_login);
btnReset = (Button) findViewById(R.id.btn_reset_password);
//Get Firebase auth instance
auth = FirebaseAuth.getInstance();
btnSignup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, signupactivity.class));
}
});
btnReset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, ResetPasswordActivity.class));
}
});
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email = inputEmail.getText().toString();
final String password = inputPassword.getText().toString();
if (TextUtils.isEmpty(email)) {
Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)) {
Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
return;
}
progressBar.setVisibility(View.VISIBLE);
//authenticate user
auth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
progressBar.setVisibility(View.GONE);
if (!task.isSuccessful()) {
// there was an error
if (password.length() < 6) {
inputPassword.setError(getString(R.string.minimum_password));
} else {
Toast.makeText(LoginActivity.this, getString(R.string.auth_failed), Toast.LENGTH_LONG).show();
}
} else {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
finish();
}
}
});
}
});
}
}
清单
<?xml version="1.0" encoding="utf-8"?>
<uses-permission-sdk-23 android:name="android.permission.CAMERA" />
<uses-permission-sdk-23 android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="AniNet"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<activity
android:name=".LoginActivity"
android:configChanges="orientation"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Main2Activity"
android:configChanges="orientation"
android:screenOrientation="portrait" />
<activity
android:name=".Main3Activity"
android:configChanges="orientation"
android:screenOrientation="portrait" />
<activity
android:name=".Main5Activity"
android:configChanges="orientation"
android:screenOrientation="portrait" />
<activity
android:name=".MainActivity"
android:configChanges="orientation"
android:screenOrientation="portrait" />
<activity
android:name=".signupactivity"
android:configChanges="orientation"
android:screenOrientation="portrait" />
<activity android:name=".myresdone" />
<activity android:name=".myresinfo" />
<activity android:name=".ResetPasswordActivity"></activity>
</application>
答案 0 :(得分：1)
因此，请确保在android清单文件中添加了intent.action。
例如：
<activity android:name=".activities.LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
答案 1 :(得分：0)
您确实从登录发布，然后致电if(auth.getCurrentUser != null){ start mainActivity}您不等待授权。您基本上是跳过登录，但它是从登录开始的。