我是Android编程的新手。我有一个启动画面，之后我试图打开一个活动，但在启动画面后，我的屏幕一直闪烁，活动也没有打开。什么都有。我的代码如下：
Splashscreen.java
public class splashscreen extends AppCompatActivity
{
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splashscreen);
imageView =(ImageView)findViewById(R.id.imageView);
Animation animation= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.slideinright);
imageView.setAnimation(animation);
animation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
finish();
startActivity(new Intent(getApplicationContext(),MainActivity.class));
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
}
}
Loginpage.java
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.Profile;
import com.facebook.ProfileTracker;
import com.facebook.appevents.AppEventsLogger;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
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 LoginActivity2 extends AppCompatActivity implements View.OnClickListener {
private Button loginbuttonRegister;
private EditText logineditTextEmail;
private EditText logineditTextPassword;
private TextView textViewLogin;
private ProgressDialog progressDialog;
private FirebaseAuth firebaseAuth;
private LoginButton loginButton;
private CallbackManager callbackManager;
private Profile profile;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login2);
progressDialog = new ProgressDialog(this);
firebaseAuth = FirebaseAuth.getInstance();
if( firebaseAuth.getCurrentUser() != null){
//display navigation activity
finish();
startActivity(new Intent(getApplicationContext(),MainActivity.class));
}
loginbuttonRegister = (Button) findViewById(R.id.loginbuttonRegister);
logineditTextEmail = (EditText) findViewById(R.id.logineditTextEmail);
logineditTextPassword = (EditText) findViewById(R.id.logineditTextPassword);
textViewLogin =(TextView) findViewById(R.id.textViewLogin);
loginbuttonRegister.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
loginbuttonRegister = (Button) findViewById(R.id.loginbuttonRegister);
if(v == loginbuttonRegister)
{
userLogin();
}
}
});
textViewLogin.setOnClickListener(this);
//Initializing Facebook Sdk.
FacebookSdk.sdkInitialize(getApplicationContext());
AppEventsLogger.activateApp(this);
//intialize callback manager
callbackManager = CallbackManager.Factory.create();
//initializing facebook login button
loginButton = (LoginButton) findViewById(R.id.login_button);
loginButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
loginButton = (LoginButton)findViewById(R.id.login_button);
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
ProfileTracker profileTracker;
@Override
public void onSuccess(LoginResult loginResult) {
Toast.makeText(LoginActivity2.this,"Succesfully Logged In",Toast.LENGTH_SHORT).show();
profile = Profile.getCurrentProfile();
//check profile is fetched or not, if not then wait for sometime
// to load your profile using profile tracker
if(profile == null){
profileTracker = new ProfileTracker() {
@Override
protected void onCurrentProfileChanged(Profile profile, Profile profile1) {
if(profile1 != null){
startActivity(new Intent(LoginActivity2.this,MainActivity.class));
}
}
};
}else{
startActivity(new Intent(LoginActivity2.this,MainActivity.class));
}
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException e) {
}
});
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode,resultCode,data);
}
private void userLogin(){
String email = logineditTextEmail.getText().toString().trim();
String password = logineditTextPassword.getText().toString().trim();
if(TextUtils.isEmpty(email)){
//mail empty
Toast.makeText(this, "Please enter email!", Toast.LENGTH_SHORT).show();
return;
}
if(TextUtils.isEmpty(password)){
Toast.makeText(this, "Please enter Password!", Toast.LENGTH_SHORT).show();
return;
}
//if valid then shows progressbar
progressDialog.setMessage("Loggin in...!");
progressDialog.show();
firebaseAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if(task.isSuccessful())
{ progressDialog.dismiss();
//start anvigation activity
finish();
startActivity(new Intent(getApplicationContext(),MainActivity.class));
}
else {progressDialog.dismiss();
Toast.makeText(LoginActivity2.this, "Failed to login! Try again.", Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public void onClick(View view) {
if(view == textViewLogin)
{finish();
startActivity(new Intent(this,Registeruser.class));
}
}
}
Loginactivity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/content_login2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.dell.Swing.LoginActivity2"
tools:showIn="@layout/activity_login2"
android:background="@drawable/probeach">
<LinearLayout
android:id="@+id/registerlayout"
android:orientation="vertical"
android:layout_centerVertical="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:layout_margin="10dp"
android:hint="Enter your E-mail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:id="@+id/logineditTextEmail"
/>
<EditText
android:layout_margin="10dp"
android:hint="Enter your Password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:id="@+id/logineditTextPassword" />
<Button
android:layout_margin="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/loginbuttonRegister"
android:text="Log In"
style="@style/Widget.AppCompat.Button.Colored"
android:background="@android:color/holo_red_dark"
android:elevation="0dp" />
<TextView
android:textAlignment="center"
android:text="Not Registered? Sign up Here"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textViewLogin" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginBottom="66dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:weightSum="1">
<TextView
android:id="@+id/orview"
android:text="Or"
android:gravity="center"
android:textAppearance="@style/TextAppearance.AppCompat.Button"
android:layout_width="match_parent"
android:layout_weight="0.63"
android:layout_height="40dp" />
<com.facebook.login.widget.LoginButton
android:layout_margin="10dp"
android:id="@+id/login_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_below="@+id/orview"
/>
</LinearLayout>
答案 0 :(得分：0)
请检查您的背景图片分辨率，
android:background="@drawable/probeach"