应用程序在运行构建

Question

对于将此主题标记为重复的善意主持人：我访问了“原始”主题并且它没有任何内容（我可以看到）可以帮助我。请重新打开这个帖子。

当我运行此构建时，我的应用程序一直崩溃（这是一个基本的登录和注册表单）。问题肯定在LoginActivity.java代码中，但我不知道问题是什么。

这是RegistrationActivity.java代码

package com.example.sean.cookappreal;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.*;

public class RegisterActivity extends AppCompatActivity {

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

        final EditText etUsername = (EditText) 
findViewById(R.id.etUsername);
        final EditText etEmailAddress = (EditText) 
findViewById(R.id.etEmailAddress);
        final EditText etPassword = (EditText) 
findViewById(R.id.etPassword);

        final Button bRegister = (Button) findViewById(R.id.bRegister);
    }
}

这是LoginActvitity.java代码：

package com.example.sean.cookappreal;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
import android.content.Intent;

public class LoginActivity extends AppCompatActivity {

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

        final EditText etUsername = (EditText) 
findViewById(R.id.etUsername);
        final EditText etPassword = (EditText) 
findViewById(R.id.etPassword);
        final Button bLogin = (Button) findViewById(R.id.bLogin);
        final TextView registerLink = (TextView) 
findViewById(R.id.tvRegisterHere);

        registerLink.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Intent registerIntent = new 
Intent(LoginActivity.this,RegisterActivity.class);
                LoginActivity.this.startActivity(registerIntent);
            }
        });
    }
}

最后这里是UserAreaActivity.java代码（这只是一个非常简单的家庭欢迎屏幕）。

package com.example.sean.cookappreal;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.*;




public class UserAreaActivity extends AppCompatActivity {

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

        final EditText etUsername = (EditText) 
     findViewById(R.id.etUsername);
        final TextView welcomeMessage = (TextView) 
     findViewById(R.id.tvWelcomeMsg);

    }
}

这是我要求的清单代码。

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.sean.cookappreal">

        <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">
            <activity android:name=".LoginActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />

                    <category 
android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
            <activity android:name=".RegisterActivity" />
            <activity android:name=".UserAreaActivity"></activity>
        </application>

    </manifest>

这是log cat信息。

07-26 17:27:17.491 13115-13115/com.example.sean.cookappreal E/Zygote: v2
07-26 17:27:17.491 13115-13115/com.example.sean.cookappreal W/SELinux: Function: selinux_compare_spd_ram, index[1], priority [2], priority version is VE=SEPF_SECMOBILE_6.0.1_0033
07-26 17:27:17.491 13115-13115/com.example.sean.cookappreal I/libpersona: KNOX_SDCARD checking this for 10238
07-26 17:27:17.491 13115-13115/com.example.sean.cookappreal I/libpersona: KNOX_SDCARD not a persona
07-26 17:27:17.501 13115-13115/com.example.sean.cookappreal E/Zygote: accessInfo : 0
07-26 17:27:17.501 13115-13115/com.example.sean.cookappreal W/SELinux: SELinux: seapp_context_lookup: seinfo=default, level=s0:c512,c768, pkgname=com.example.sean.cookappreal 
07-26 17:27:17.501 13115-13115/com.example.sean.cookappreal I/art: Late-enabling -Xcheck:jni
07-26 17:27:17.541 13115-13115/com.example.sean.cookappreal D/TimaKeyStoreProvider: TimaSignature is unavailable
07-26 17:27:17.541 13115-13115/com.example.sean.cookappreal D/ActivityThread: Added TimaKeyStore provider
07-26 17:27:17.581 13115-13115/com.example.sean.cookappreal D/ResourcesManager: For user 0 new overlays fetched Null
07-26 17:27:17.721 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_dependencies_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_dependencies_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:17.951 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_0_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_0_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.021 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_1_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_1_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.081 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_2_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_2_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.151 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_3_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_3_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.211 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_4_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_4_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.271 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_5_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_5_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.331 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_6_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_6_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.401 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_7_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_7_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.471 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_8_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_8_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.531 13115-13115/com.example.sean.cookappreal W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=speed --instruction-set-variant=cortex-a15 --instruction-set-features=default --dex-file=/data/app/com.example.sean.cookappreal-1/split_lib_slice_9_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.example.sean.cookappreal-1@split_lib_slice_9_apk.apk@classes.dex) because non-0 exit status
07-26 17:27:18.531 13115-13115/com.example.sean.cookappreal W/System: ClassLoader referenced unknown path: /data/app/com.example.sean.cookappreal-1/lib/arm
07-26 17:27:18.541 13115-13115/com.example.sean.cookappreal I/InstantRun: starting instant run server: is main process
07-26 17:27:18.671 13115-13115/com.example.sean.cookappreal W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.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
07-26 17:27:18.891 13115-13115/com.example.sean.cookappreal D/AndroidRuntime: Shutting down VM
07-26 17:27:18.891 13115-13115/com.example.sean.cookappreal E/AndroidRuntime: FATAL EXCEPTION: main
                                                                              Process: com.example.sean.cookappreal, PID: 13115
                                                                              java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sean.cookappreal/com.example.sean.cookappreal.LoginActivity}: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
                                                                                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3255)
                                                                                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3351)
                                                                                  at android.app.ActivityThread.access$1100(ActivityThread.java:222)
                                                                                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1796)
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                  at android.os.Looper.loop(Looper.java:158)
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:7230)
                                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
                                                                               Caused by: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
                                                                                  at com.example.sean.cookappreal.LoginActivity.onCreate(LoginActivity.java:19)
                                                                                  at android.app.Activity.performCreate(Activity.java:6877)
                                                                                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
                                                                                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3208)
                                                                                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3351) 
                                                                                  at android.app.ActivityThread.access$1100(ActivityThread.java:222) 
                                                                                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1796) 
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                  at android.os.Looper.loop(Looper.java:158) 
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:7230) 
                                                                                  at java.lang.reflect.Method.invoke(Native Method) 
                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
07-26 17:32:19.201 13115-13115/com.example.sean.cookappreal I/Process: Sending signal. PID: 13115 SIG: 9

这是我的活动登记册布局

这是我的活动登录布局

Answer 1

正如我所看到的，您使用了两次ID为etUsername和etPassword的ID。您可以使用它们只需使用一次完整的应用程序。此外，不能通过id找到和元素，这不在布局中。

拉​​茶