我遵循了YouTube教程(https://www.youtube.com/watch?v=y8R2C86BIUc&list=PLgCYzUzKIBE8KHMzpp6JITZ2JxTgWqDH2),并且在最后一步中,教师使用了名为LocalBroadcastManager
的类。但是不再支持此类。.(https://developer.android.com/reference/androidx/localbroadcastmanager/content/LocalBroadcastManager)并且由于此类/错误,Android Studio无法编译。
据我了解-我是Android Studio / Java的新手-有一个选项可以将项目迁移到androidx-libraries以使代码运行,但是我不知道该怎么做。
如果我要问一个绝对新手的问题,请给我一个提示,在这里我可以获取解决问题的基本信息。 另外,Android Studio的更改/开发速度非常快,因此据我所知,那里的解决方案不再是最新的。
我尝试了stackoverflow的一些解决方案,但由于是绝对的初学者,所以我无法弄清楚该放在哪里。
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.0"
defaultConfig {
applicationId "com.example.btytcodingwithmitch"
minSdkVersion 15
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0-rc01'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta2'
testImplementation 'junit:junit:4.13-beta-3'
androidTestImplementation 'androidx.test:runner:1.3.0-alpha01'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0-alpha01'
}
package com.example.btytcodingwithmitch;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.security.PrivateKey;
import java.util.UUID;
public class BluetoothConnectionService {
...
private class ConnectedThread extends Thread{
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public void run(){
byte[] buffer = new byte[1024]; //buffer store for stream
int bytes; //bytes returned from read
while (true){
//read from Input Stream
try {
bytes = mmInStream.read(buffer);
String incomingMessage = new String(buffer, 0, bytes);
Log.d(TAG, "InputStream" + incomingMessage);
Intent incomingMessageIntent = new Intent("incoming Message");
incomingMessageIntent.putExtra("theMessage", incomingMessage);
LocalBroadcastManager.getInstance(mContext).sendBroadcast(incomingMessageIntent);
} catch (IOException e) {
Log.e(TAG, "write: Error reading inputstream" + e.getMessage());
break;
}
}
}
错误消息:
“错误:找不到符号变量LocalBroadcastManager”
答案 0 :(得分:1)
将此添加到您的build.gradle文件中:
androidx.localbroadcastmanager:localbroadcastmanager:1.0.0
然后重建项目
这应该有效