应用程序在模拟器上工作，但不在设备上？

Question

MyApp根本无法启动。它开始打开并关闭。我猜我在Build开发人员要求我更改代码版本时在Build中搞砸了一些东西，虽然我不确定。非常感谢任何帮助。我很肯定我犯了一些非常基本的错误，虽然我不能指责它。它在Nexus仿真器上完美运行。

之前它只是一个启动画面，导致了一个webview。然后我添加了一个带有两个选项（按钮）的页面，以便在启动动画后选择webview。这是我所做的改变，虽然如果它在仿真器上工作我不确定活动代码是否是issdue。

的build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
    defaultConfig {
        applicationId "com.utilities.livegoldsilverusd"
        minSdkVersion 16
        targetSdkVersion 26
        versionCode 3
        versionName "1.3"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags "-frtti -fexceptions"
            }
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    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.constraint:constraint-layout:1.0.2'
    compile 'com.google.android.gms:play-services-ads:11.0.4'
    testCompile 'junit:junit:4.12'
}

的Manifest.xml

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

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/newicon"
        android:label="LiveMCXRates"
        android:roundIcon="@mipmap/newicon"
        android:supportsRtl="false"
        android:theme="@style/AppTheme">

        <!-- Splash screen -->

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

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".options"
            android:label="@string/app_name"></activity>
        <activity
            android:name=".Bitcoin"
            android:label="@string/app_name">
        </activity>
    </application>

</manifest>

MainActivity.Java

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.Toast;

import static android.icu.lang.UCharacter.GraphemeClusterBreak.T;


public class MainActivity extends AppCompatActivity {
    private WebView myWebView;

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

        if (!isConnected(MainActivity.this)) buildDialog(MainActivity.this).show();
        else {
            Toast.makeText(MainActivity.this, "Let's Make Money! WooHoo", Toast.LENGTH_LONG).show();
            setContentView(R.layout.activity_main);
        }

        {
            myWebView = (WebView) findViewById(R.id.myWebView);
            WebSettings webSettings = myWebView.getSettings();
            webSettings.setJavaScriptEnabled(true);
            webSettings.setBuiltInZoomControls(true);
            webSettings.setUseWideViewPort(true);
            webSettings.setLoadWithOverviewMode(true);
            myWebView.loadUrl("http://viralonworld.com/m1/runtmfultb.php");
            myWebView.setWebViewClient(new WebViewClient());
        }
    }

    public boolean isConnected(Context context) {

        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netinfo = cm.getActiveNetworkInfo();

        if (netinfo != null && netinfo.isConnectedOrConnecting()) {
            android.net.NetworkInfo wifi = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            android.net.NetworkInfo mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

            if((mobile != null && mobile.isConnectedOrConnecting()) || (wifi != null && wifi.isConnectedOrConnecting())) return true;
        else return false;
        } else
        return false;
    }

    public AlertDialog.Builder buildDialog(Context c) {

        AlertDialog.Builder builder = new AlertDialog.Builder(c);
        builder.setTitle("No Internet Connection");
        builder.setMessage("You need to have Mobile Data or wifi to access this. Press ok to Exit");

        builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {

                finish();
            }
        });

        return builder;
    }


    @Override
    public void onBackPressed() {
        if (myWebView.canGoBack()) {
            myWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }
}

Options.Java

package com.utilities.livegoldsilverusd;

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

import static com.utilities.livegoldsilverusd.R.id.button1;
import static com.utilities.livegoldsilverusd.R.layout.activity_options;



public class options extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(activity_options);
        Button button1 = (Button) findViewById(R.id.button1);
        Button button2 = (Button) findViewById(R.id.button2);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent myIntent = new Intent(options.this, MainActivity.class);
                startActivity(myIntent);
            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent myIntent = new Intent(options.this, Bitcoin.class);
                startActivity(myIntent);
            }
        });
    }
}

Bitcoin.java

package com.utilities.livegoldsilverusd;

import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.Toast;

import static android.icu.lang.UCharacter.GraphemeClusterBreak.T;


public class Bitcoin extends Activity {
    private WebView myWebView;

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

        if (!isConnected(Bitcoin.this)) buildDialog(Bitcoin.this).show();
        else {
            Toast.makeText(Bitcoin.this, "Let's Make Money! WooHoo", Toast.LENGTH_LONG).show();
            setContentView(R.layout.activity_main);
        }

        {
            myWebView = (WebView) findViewById(R.id.myWebView);
            WebSettings webSettings = myWebView.getSettings();
            webSettings.setJavaScriptEnabled(true);
            webSettings.setBuiltInZoomControls(true);
            webSettings.setUseWideViewPort(true);
            webSettings.setLoadWithOverviewMode(true);
            myWebView.loadUrl("http://bitcointicker.co/");
            myWebView.setWebViewClient(new WebViewClient());
        }
    }

    public boolean isConnected(Context context) {

        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netinfo = cm.getActiveNetworkInfo();

        if (netinfo != null && netinfo.isConnectedOrConnecting()) {
            android.net.NetworkInfo wifi = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            android.net.NetworkInfo mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

            if ((mobile != null && mobile.isConnectedOrConnecting()) || (wifi != null && wifi.isConnectedOrConnecting()))
                return true;
            else return false;
        } else
            return false;
    }

    public AlertDialog.Builder buildDialog(Context c) {

        AlertDialog.Builder builder = new AlertDialog.Builder(c);
        builder.setTitle("No Internet Connection");
        builder.setMessage("You need to have Mobile Data or wifi to access this. Press ok to Exit");

        builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {

                finish();
            }
        });

        return builder;
    }


    @Override
    public void onBackPressed() {
        if (myWebView.canGoBack()) {
            myWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }
}

activity_options.xml

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/background_dark">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:layout_marginBottom="146dp"
        android:background="@drawable/buttonshape"
        android:onClick="goToMainActivity"
        android:shadowColor="#A8A8A8"
        android:shadowDx="0"
        android:shadowDy="0"
        android:shadowRadius="5"
        android:text="Live MCX Rates"
        android:textColor="#FFFFFF"
        android:textSize="30sp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />
    <Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="60dp"
    android:layout_marginBottom="74dp"
    android:background="@drawable/buttonshape"
    android:onClick="goTobitcoin"
    android:shadowColor="#A8A8A8"
    android:shadowDx="0"
    android:shadowDy="0"
    android:shadowRadius="5"
    android:text="BitCoin"
    android:textColor="#FFFFFF"
    android:textSize="30sp"
        android:layout_above="@+id/button1"
        android:layout_alignLeft="@+id/button1"
        android:layout_alignStart="@+id/button1" />


</RelativeLayout>

activity_bitcoin.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.utilities.livegoldsilverusd.MainActivity">


    <WebView
        android:id="@+id/myWebView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true" />
</RelativeLayout>

Answer 1

我认为问题是由于我们正在设置activity_main的内容视图，它会加载一个包含带有android的webView的布局文件：id =“@ + id / myWebView ...
在activity_main中设置WebView时解决了该问题; 在你的activity_main中写下这个。我认为问题会解决......

 <WebView
    android:id="@+id/myWebView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true" />

还可以通过将MainActivity设置为启动器而不是欢迎

来修改Manifest.xml

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

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

<application
    android:allowBackup="true"
    android:icon="@mipmap/newicon"
    android:label="LiveMCXRates"
    android:roundIcon="@mipmap/newicon"
    android:supportsRtl="false"
    android:theme="@style/AppTheme">

    <!-- Splash screen -->

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

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

    <activity
        android:name=".options"
        android:label="@string/app_name"></activity>
    <activity
        android:name=".Bitcoin"
        android:label="@string/app_name">
    </activity>
  </application>

 </manifest>