Mac电脑Android Studio升级提示Android Studio does not have write

博客主要讲述了将 Android Studio 从 3.0.1 升级到 3.4.1 时,出现无写入权限的提示,即 Android Studio does not have write access to /Applications/Android Studio.app/Contents。并给出了解决办法,使用 sudo chmod -R 775 /Applications/Android\\ Studio.app/ 命令。

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Android Studio 3.0.1 升级到3.4.1 时提示:
Android Studio does not have write access to /Applications/Android Studio.app/Contents.
解决办法:
sudo chmod -R 775 /Applications/Android\ Studio.app/

### Android Studio 中蓝牙模块开发指南 #### 功能概述 在 Android 应用中集成蓝牙功能通常涉及以下几个方面:初始化蓝牙适配器、扫描可用设备、建立连接以及数据传输。以下是基于提供的引用内容和专业知识整理的开发指南。 --- #### 初始化蓝牙适配器 要启用蓝牙功能,首先需要获取系统的 `BluetoothAdapter` 实例并检查设备是否支持蓝牙。如果支持,则可以尝试打开蓝牙: ```java import android.bluetooth.BluetoothAdapter; import android.content.Intent; public class BluetoothManager { private static final String TAG = "BluetoothManager"; public void initializeBluetooth() { BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (bluetoothAdapter == null) { // 设备不支持蓝牙 System.out.println("Device does not support Bluetooth"); } else { if (!bluetoothAdapter.isEnabled()) { Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, 1); // 请求用户手动开启蓝牙 } } } public boolean openBluetooth() { BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); return bluetoothAdapter.enable(); // 启用蓝牙返回布尔值表示成功与否[^3] } } ``` --- #### 扫描蓝牙设备 通过广播接收器监听蓝牙状态变化,并启动设备发现过程: ```java import android.bluetooth.BluetoothDevice; import android.content.BroadcastReceiver; import android.content.Context; import android.content.IntentFilter; public class DeviceScanner { private Context context; private BroadcastReceiver receiver; public DeviceScanner(Context context) { this.context = context; initBroadcastReceiver(); } private void initBroadcastReceiver() { receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (BluetoothDevice.ACTION_FOUND.equals(action)) { BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); System.out.println("Found device: " + device.getName()); } } }; context.registerReceiver(receiver, new IntentFilter(BluetoothDevice.ACTION_FOUND)); } public void startDiscovery() { BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter(); if (adapter != null && adapter.isDiscovering()) { adapter.cancelDiscovery(); } adapter.startDiscovery(); // 开始扫描附近设备 } } ``` --- #### 建立蓝牙连接 当找到目标设备后,可以通过其 MAC 地址创建 RFCOMM 连接通道并与之通信: ```java import java.io.InputStream; import java.io.OutputStream; import java.util.UUID; import javax.bluetooth.RemoteDevice; import javax.microedition.io.StreamConnection; public class BluetoothConnector { private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); public StreamConnection connect(String macAddress) throws Exception { RemoteDevice remoteDevice = getRemoteDevice(macAddress); String connectionUrl = "btspp://" + remoteDevice.getAddress() + ":" + MY_UUID.toString(); return (StreamConnection) Connector.open(connectionUrl); } public InputStream getDataInputStream(StreamConnection conn) throws IOException { return conn.openInputStream(); } public OutputStream getDataOutputStream(StreamConnection conn) throws IOException { return conn.openOutputStream(); } } ``` --- #### 数据交互示例 假设已与 HC-06 模块建立了连接,下面展示如何向 Arduino 发送命令并通过回调读取响应: ```java public class DataActivity extends AppCompatActivity { private BluetoothSocket socket; private OutputStream outputStream; private InputStream inputStream; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); try { BluetoothDevice device = ...; // 获取目标设备实例 socket = device.createRfcommSocketToServiceRecord(MY_UUID); socket.connect(); outputStream = socket.getOutputStream(); inputStream = socket.getInputStream(); sendCommand("hello"); // 测试发送消息给Arduino } catch (IOException e) { e.printStackTrace(); } } private void sendCommand(String command) throws IOException { outputStream.write(command.getBytes()); // 将字符串转换为字节数组写入流中 } private String readResponse() throws IOException { byte[] buffer = new byte[1024]; int bytes = inputStream.read(buffer); return new String(buffer, 0, bytes); // 返回从输入流读取的内容 } } ``` --- #### XML 布局文件配置 为了提供友好的用户体验,在界面上设计相应的控件用于控制蓝牙操作。例如,添加一个按钮触发蓝牙开关逻辑: ```xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/btn_toggle_bluetooth" android:text="Toggle Bluetooth" android:onClick="toggleBluetooth" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout> ``` 对应的 Java 方法定义如下: ```java public void toggleBluetooth(View view) { BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter(); if (adapter.isEnabled()) { adapter.disable(); // 关闭蓝牙 } else { adapter.enable(); // 打开蓝牙 } } ``` --- #### 注意事项 1. 需要在 `AndroidManifest.xml` 文件声明必要的权限: ```xml <uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> ``` 2. 对于 API Level >= 31 的版本还需要动态请求位置权限才能正常工作。 ---
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