Question

如何解决此RunTimeException？在按钮上单击时会发生此异常。尝试关闭Instant Run甚至尝试清理并重新启动应用程序，但没有任何效果。这里的实际问题是什么。

我正在使用Android Studio。

致命的例外：主要

Process: com.shiva, PID: 18632 
                                                       java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/things/pio/PeripheralManagerService;
                                                                         at com.shiva.MainActivity$1.onClick(MainActivity.java:25)
                                                                         at android.view.View.performClick(View.java:5637)
                                                                         at android.view.View$PerformClick.run(View.java:22429)
                                                                         at android.os.Handler.handleCallback(Handler.java:751)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                         at android.os.Looper.loop(Looper.java:154)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

                                                                      Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.things.pio.PeripheralManagerService" on path: DexPathList[[zip file "/data/app/com.shiva-1/base.apk"],nativeLibraryDirectories=[/data/app/com.shiva-1/lib/x86, /system/lib, /vendor/lib]]
                                                                         at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
                                                                         at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
                                                                         at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
                                                                         at com.shiva.adafona_trial.MainActivity$1.onClick(MainActivity.java:25) 
                                                                         at android.view.View.performClick(View.java:5637) 
                                                                         at android.view.View$PerformClick.run(View.java:22429) 
                                                                         at android.os.Handler.handleCallback(Handler.java:751) 
                                                                         at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                         at android.os.Looper.loop(Looper.java:154) 
                                                                         at android.app.ActivityThread.main(ActivityThread.java:6119) 
                                                                         at java.lang.reflect.Method.invoke(Native Method) 
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

的build.gradle

apply plugin: 'com.android.application'

android {
compileSdkVersion 25
buildToolsVersion "25.0.1"
defaultConfig {
    applicationId "com.shiva"
    minSdkVersion 24
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

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:support-v4:25.0.+'
compile 'com.android.support:appcompat-v7:+'
provided 'com.google.android.things:androidthings:0.4.1-devpreview'
//provided 'com.google.android.things.pio.PeripheralManagerService'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}

的AndroidManifest.xml

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

<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">
    <uses-library android:name="com.google.android.things" android:required="false"/>
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.IOT_LAUNCHER"/>
            <category android:name="android.intent.category.DEFAULT"/>
        </intent-filter>
    </activity>
</application>

MainActivity.java

package com.shiva;

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.Toast;
import com.google.android.things.pio.PeripheralManagerService;
import java.util.List;

public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
Button btnShow;
PeripheralManagerService manager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btnShow = (Button)findViewById(R.id.button_click);
    btnShow.setOnClickListener(new View.OnClickListener() {
                @Override
               public void onClick(View v){
                     manager = new PeripheralManagerService();
                     List<String> deviceList = 
manager.getUartDeviceList();
                     if (deviceList.isEmpty()) {
                        Log.i(TAG, "No UART port available on this 
device.");
                     } else {
                        Log.i(TAG, "List of available devices: " + deviceList);
                        Toast.makeText(getApplicationContext(),deviceList.get(0),Toast.LENGTH_LONG).show();
                     }
               }
    });
}
}

Answer 1

我有一个类似的问题，结果在我的清单中，我没有<uses-library android:name="com.google.android.things"/>。我会尝试删除android:required="false"，因为您的申请明确要求。

Answer 2

PeripheralManagerService类已重命名，您需要使用PeripheralManager类。

类型：

import com.google.android.things.pio.PeripheralManager;

而不是：

import com.google.android.things.pio.PeripheralManagerService;

同样输入：`

PeripheralManager manager;

而不是：

PeripheralManagerService manager;

最后输入：

manager = PeripheralManager.getInstance();

而不是：

manager = new PeripheralManagerService();

同时查看此问题：

PeripheralManagerService throws NoClassDefFoundError

`

java.lang.ClassNotFoundException：未找到类“com.google.android.things.pio.PeripheralManagerService”

2 个答案: