Question

我正在尝试通过UART电缆将设备（血氧仪）连接到Android智能手机。因此，我需要构建一个能够从该设备读取数据的应用程序。为此，我正在使用Android Things，但无法使该应用程序运行，因为我收到此错误：“安装失败。安装失败重新运行”

很确定，这个标签“ uses-library android：name =“ com.google.android.things” android：required =“ true”“使我收到此错误，但没有运行但崩溃了。

MainActivity：

public class MainActivity extends Activity {

String TAG = "Log";

private static final String UART_DEVICE_NAME = null;

private UartDevice mDevice;

private TextView tv;
private List<String> serial;

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

    tv = findViewById(R.id.serial);
    serial = new ArrayList<>();

    PeripheralManager manager = PeripheralManager.getInstance();
    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);
    }

    // Attempt to access the UART device
    try {
        mDevice = manager.openUartDevice(deviceList.get(0));
    } catch (IOException e) {
        Log.w(TAG, "Unable to access UART device", e);
    }
    try {
        setFlowControlEnabled(mDevice, false);
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        configureUartFrame(mDevice);
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        writeUartData(mDevice);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();

    if (mDevice != null) {
        try {
            mDevice.close();
            mDevice = null;
        } catch (IOException e) {
            Log.w(TAG, "Unable to close UART device", e);
        }
    }
}

public void configureUartFrame(UartDevice uart) throws IOException {
    // Configure the UART port
    uart.setBaudrate(57600);
    uart.setDataSize(8);
    uart.setParity(UartDevice.PARITY_NONE);
    uart.setStopBits(1);
}

public void setFlowControlEnabled(UartDevice uart, boolean enable) throws 
IOException {
        uart.setHardwareFlowControl(UartDevice.HW_FLOW_CONTROL_NONE);
}

public void writeUartData(UartDevice uart) throws IOException {
    byte[] raw = new byte[]{(byte) 0xA5, (byte) 0x10, (byte) 0x02, (byte) 
0x1A, (byte) 0x00, (byte) 0x00};
    byte cs = (byte) ((raw[1] ^ raw[2] ^ raw[3] ^ raw[4]) & 0xFF);
    raw[5] = cs;
    int count = uart.write(raw, raw.length);
    Log.d(TAG, "Wrote " + count + " bytes to peripheral");
    readUartBuffer(uart);
}

public void readUartBuffer(UartDevice uart) throws IOException {
    // Maximum amount of data to read at one time
    final int maxCount = 9600;
    byte[] buffer = new byte[maxCount];

    int count;
    while ((count = uart.read(buffer, buffer.length)) > 0) {
        Log.d(TAG, "Read " + count + " bytes from peripheral");
        serial.add(String.valueOf(buffer[count]) + " ");
    }
    StringBuilder data = new StringBuilder();
    for (int i = 0; i < serial.size(); i++) {
        data.append(serial.get(i));
    }
    tv.setText(data);
}
}

AndroidManifest：

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

<uses-permission 
android:name="com.google.android.things.permission.USE_PERIPHERAL_IO" />

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

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

    <uses-library android:name="com.google.android.things" 
android:required="true"/>
</application>

</manifest>

build.Gradle：

apply plugin: 'com.android.application'

android {
compileSdkVersion 29
buildToolsVersion "29.0.0"
defaultConfig {
    applicationId "com.example.oximetro"
    minSdkVersion 27
    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:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'com.google.android.things:androidthings:+'
}

我非常感谢您提供的任何帮助，甚至可以替代我正在尝试做的事情，即使用Android智能手机通过UART从血氧仪读取数据。运行此代码，我得到上面提到的错误，因此该应用程序甚至无法在设备上打开。

Answer 1

您无法在手机上运行Android Things库。您的电话没有用于连接硬件的库挂钩。知道它没有运行该应用程序所需的一切的手机，应拒绝安装。

如何修复'安装失败。在Android中安装失败<a href='rerun'> Rerun </a>'错误？

1 个答案: