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java - 编译android应用程序时出现问题

转载 作者：太空宇宙 更新时间：2023-11-04 11:09:37 24 4
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晚上好。我正在学习 Android 类(class)，但在编译应用程序时遇到问题。

我目前正在关注this教程。我之前已经为 GET 请求设置了 requestQueue。

这是我的 MainActivity.java 文件:

package com.ticketapp.emailaddresss.ticketapp;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.facebook.AccessToken;

import com.facebook.GraphRequest;
import com.facebook.GraphResponse;
import com.facebook.HttpMethod;
import com.facebook.login.LoginManager;
import com.facebook.share.model.ShareHashtag;
import com.facebook.share.model.ShareLinkContent;
import com.facebook.share.widget.ShareDialog;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    Button button;
    TextView textView;
    String server_url = "https://www.idg.se/";
    RequestQueue requestQueue;

    private ShareDialog shareDialog;
    private String name, surname, imageUrl;
    private String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.bm);
        textView = (TextView) findViewById(R.id.txt);

        Bundle inBundle = getIntent().getExtras();
        name = inBundle.getString("name");
        surname = inBundle.getString("surname");
        imageUrl = inBundle.getString("imageUrl");

        TextView nameView = (TextView) findViewById(R.id.nameAndSurname);
        nameView.setText("" + name + " " + surname);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                StringRequest stringRequest = new StringRequest(Request.Method.POST, server_url, new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                    textView.setText(response);
                    //requestQueue.stop();
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        textView.setText("Something went wrong");
                        error.printStackTrace();
                        //requestQueue.stop();
                    }
                });
                //requestQueue.add(stringRequest);
                SingletonRequestQueue.getmInstance(getApplicationContext()).addRequestQueue(stringRequest);
            }
        });
    }

    private void share() {
        shareDialog = new ShareDialog(this);
        List<String> taggedUserIds = new ArrayList<String>();
        taggedUserIds.add("{USER_ID}");
        taggedUserIds.add("{USER_ID}");
        taggedUserIds.add("{USER_ID}");

        ShareLinkContent content = new ShareLinkContent.Builder()
                .setContentUrl(Uri.parse("http://www.sitepoint.com"))
                .setContentTitle("This is a content title")
                .setContentDescription("This is a description")
                .setShareHashtag(new ShareHashtag.Builder().setHashtag("#sitepoint").build())
                .setPeopleIds(taggedUserIds)
                .setPlaceId("{PLACE_ID}")
                .build();

        shareDialog.show(content);
    }

    private void getPosts() {
        new GraphRequest(AccessToken.getCurrentAccessToken(), "/me/posts", null, HttpMethod.GET, new GraphRequest.Callback() {
            public void onCompleted(GraphResponse response) {
                Log.e(TAG, response.toString());
            }
        }).executeAsync();
    }

    private void logout() {
        LoginManager.getInstance().logOut();
        Intent login = new Intent(MainActivity.this, LoginActivity.class);
        startActivity(login);
        finish();
    }

    //@Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.share:
                share();
                break;

            case R.id.getPosts:
                getPosts();
                break;

            case R.id.logout:
                logout();
                break;
        }
    }
}

LoginActivity.java

package com.ticketapp.emailaddress.ticketapp;

import android.content.Intent;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import com.facebook.AccessTokenTracker;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.GraphRequest;
import com.facebook.GraphResponse;
import com.facebook.ProfileTracker;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;

import org.json.JSONException;
import org.json.JSONObject;

import java.net.MalformedURLException;
import java.net.URL;

public class LoginActivity extends AppCompatActivity {

    private CallbackManager callbackManager;
    private AccessTokenTracker accessTokenTracker;
    private ProfileTracker profileTracker;
    private LoginButton loginButton;
    private String firstName,lastName, email,birthday,gender;
    private URL profilePicture;
    private String userId;
    private String TAG = "LoginActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // FacebookSdk.sdkInitialize(this);
        //FacebookSdk.sdkInitialize(getApplicationContext());

        setContentView(R.layout.activity_login);
        callbackManager = CallbackManager.Factory.create();

        loginButton = (LoginButton) findViewById(R.id.login_button);
        loginButton.setHeight(100);
        loginButton.setTextColor(Color.WHITE);
        loginButton.setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
        loginButton.setCompoundDrawablePadding(0);

        loginButton.setReadPermissions("email", "user_birthday","user_posts");
        loginButton.registerCallback(callbackManager, callback);
    }

    FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
                @Override
                public void onCompleted(JSONObject object, GraphResponse response) {
                    Log.e(TAG,object.toString());
                    Log.e(TAG,response.toString());

                    try {
                        userId = object.getString("id");
                        profilePicture = new URL("https://graph.facebook.com/" + userId + "/picture?width=500&height=500");
                        if(object.has("first_name"))
                            firstName = object.getString("first_name");
                        if(object.has("last_name"))
                            lastName = object.getString("last_name");
                        if (object.has("email"))
                            email = object.getString("email");
                        if (object.has("birthday"))
                            birthday = object.getString("birthday");
                        if (object.has("gender"))
                            gender = object.getString("gender");

                        Intent main = new Intent(LoginActivity.this,MainActivity.class);
                        main.putExtra("name",firstName);
                        main.putExtra("surname",lastName);
                        main.putExtra("imageUrl",profilePicture.toString());
                        startActivity(main);
                        finish();
                    } catch (JSONException e) {
                        e.printStackTrace();
                    } catch (MalformedURLException e) {
                        e.printStackTrace();
                    }
                }
            });
            //Here we put the requested fields to be returned from the JSONObject
            Bundle parameters = new Bundle();
            parameters.putString("fields", "id, first_name, last_name, email, birthday, gender");
            request.setParameters(parameters);
            request.executeAsync();
        }

        @Override
        public void onCancel() {
        }

        @Override
        public void onError(FacebookException e) {
            e.printStackTrace();
        }
    };

    @Override
    protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
        super.onActivityResult(requestCode, responseCode, intent);
        callbackManager.onActivityResult(requestCode, responseCode, intent);
    }
}

SingletonRequestQueue.java

package com.ticketapp.emailaddress.ticketapp;

import android.content.Context;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

import java.lang.ref.ReferenceQueue;

/**
 * Created by Adde on 2017-09-11.
 */

public class SingletonRequestQueue {
    private
    static SingletonRequestQueue mInstance;
    private RequestQueue requestQueue;
    private static Context mCtx;


    private SingletonRequestQueue(Context context){
         mCtx = context;
        requestQueue = getRequestQueue();
    }

    public RequestQueue getRequestQueue(){

        if(requestQueue == null){
            requestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
        }
        return requestQueue;
    }
    public static synchronized SingletonRequestQueue getmInstance(Context context) {
        if(mInstance == null){
            mInstance = new SingletonRequestQueue(context);
        }
        return mInstance;
    }

    public<T> void addRequestQueue(Request<T> request){
        requestQueue.add(request);
    }
}

build.gradle(模块)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
    defaultConfig {
        applicationId "com.ticketapp.myName.ticketapp"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    //FB SDK
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'

    // compile 'com.android.support:design:26.0.1'
    // compile 'com.android.support:appcompat-v7:26.0.1'

    // compile 'com.android.support:multidex:1.0.1'
    // Firebase

    // Volley
    // compile 'com.android.volley:volley:1.0.0'

    compile 'com.facebook.android:facebook-android-sdk:[4,5)'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.google.firebase:firebase-auth:11.2.2'
    compile 'com.mcxiaoke.volley:library:1.0.19'
    //compile "com.google.android.gms:play-services-location:11.2.2"

    testCompile 'junit:junit:4.12'
}

// Add to the bottom of the file
apply plugin: 'com.google.gms.google-services'

build.gradle(应用程序)

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()

        //FB SDK
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        // Add this line
        classpath 'com.google.gms:google-services:3.1.0'
    }
}

allprojects {
    repositories {

        jcenter()

        //FB SDK
        maven {
            url "https://maven.google.com" // Google's Maven repository
        }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

logcat消息

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ticketapp.myname.ticketapp, PID: 9650
java.lang.RuntimeException: Unable to start activity 

ComponentInfo{com.ticketapp.myname.ticketapp/com.ticketapp.myname.ticketapp.MainActivity}: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.facebook.login.widget.LoginButton
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

Caused by: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.facebook.login.widget.LoginButton
Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class com.facebook.login.widget.LoginButton
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:292)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.ticketapp.myname.ticketapp.MainActivity.onCreate(MainActivity.java:49)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

Caused by: The SDK has not been initialized, make sure to call FacebookSdk.sdkInitialize() first.
at com.facebook.internal.Validate.sdkInitialized(Validate.java:145)
at com.facebook.AccessTokenTracker.<init>(AccessTokenTracker.java:55)
at com.facebook.login.widget.LoginButton$2.<init>(LoginButton.java:581)
at com.facebook.login.widget.LoginButton.configureButton(LoginButton.java:581)
at com.facebook.FacebookButtonBase.<init>(FacebookButtonBase.java:64)
at com.facebook.login.widget.LoginButton.<init>(LoginButton.java:210)
at java.lang.reflect.Constructor.newInstance0(Native Method) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:334) 
at android.view.LayoutInflater.createView(LayoutInflater.java:647) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:515) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:292) 
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
at com.ticketapp.myname.ticketapp.MainActivity.onCreate(MainActivity.java:49) 
at android.app.Activity.performCreate(Activity.java:6975) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6541) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 

list 

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.INTERNET" />

<activity
    android:name="com.facebook.CustomTabActivity"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />

        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />

        <data android:scheme="@string/fb_login_protocol_scheme" />
    </intent-filter>
</activity>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <meta-data
        android:name="com.facebook.sdk.ApplicationId"
        android:value="Secretokrn" />

    <activity
        android:name="com.facebook.FacebookActivity"
        android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:label="@string/app_name"
        android:screenOrientation="portrait" />


    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <provider
        android:name="com.facebook.FacebookContentProvider"
        android:authorities="com.facebook.app.FacebookContentProviderSecretToken"
        android:exported="true" />

    <activity android:name=".LoginActivity"></activity>
</application>

字符串.xml

<resources>
    <string name="app_name">TicketApp</string>
    <string name="facebook_app_id">SecretToken</string>
    <string name="fb_login_protocol_scheme">fbSecretToken</string>
    <string name="app_id">$app_id_here</string>
    <string name="ShareContent">Share Content</string>
    <string name="Posts">Posts</string>
    <string name="Logout">Logout</string>
    <string name="Hello">Hello</string>
</resources>

我希望我已经包含了足够的内容来复制这个问题或在不进行测试的情况下解决它。

更新了目录。

09-12 15:13:21.988 5675-5675/com.ticketapp.myname.ticketapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ticketapp.myname.ticketapp, PID: 5675
java.lang.RuntimeException: Unable to start activity 
ComponentInfo{com.ticketapp.myname.ticketapp/com.ticketapp.myname.ticketapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
at com.ticketapp.myname.ticketapp.MainActivity.onCreate(MainActivity.java:76)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6541) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 

好的，伙计们!新更新!显然代码中存在问题，所以我尝试并捕获并且应用程序工作了。不幸的是，当您登录时，目前没有任何显示。这是我在 MainActivity.java 中更改的内容

try {
    name = inBundle.getString("name");
    surname = inBundle.getString("surname");
    imageUrl = inBundle.getString("imageUrl");
    TextView nameView = (TextView) findViewById(R.id.nameAndSurname);
    nameView.setText("" + name + " " + surname);
} catch (Exception e){
    Log.e("Error on setContent", e.getMessage());
}

最佳答案

在您的 MainActivity 中，您有以下内容:

Bundle inBundle = getIntent().getExtras();
    name = inBundle.getString("name");
    surname = inBundle.getString("surname");
    imageUrl = inBundle.getString("imageUrl");

但是第一次加载它时，inBundle将为空。您应该在对其运行 getString 之前检查它是否为 null:

Bundle inBundle = getIntent().getExtras();
if(inBundle!=null){
    name = inBundle.getString("name");
    surname = inBundle.getString("surname");
    imageUrl = inBundle.getString("imageUrl");
}

关于java - 编译android应用程序时出现问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46163690/

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