要在Android Studio中使用BLE GATT连接将数据写入自定义服务和特征，可以按照以下步骤进行：

1. 在AndroidManifest.xml文件中添加必需的权限，例如：

2. 在build.gradle文件中添加必需的依赖项，例如：

implementation 'androidx.appcompat:appcompat:1.3.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
implementation 'com.google.android.material:material:1.4.0'
implementation 'androidx.recyclerview:recyclerview:1.2.1'
implementation 'androidx.cardview:cardview:1.0.0'
implementation 'androidx.annotation:annotation:1.2.0'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-runtime:2.3.1'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-common-java8:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-savedstate:2.3.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2'
implementation 'androidx.navigation:navigation-fragment-ktx:2.4.0-alpha05'
implementation 'androidx.navigation:navigation-ui-ktx:2.4.0-alpha05'
implementation 'androidx.navigation:navigation-compose:2.4.0-alpha05'
implementation 'androidx.compose.runtime:runtime:1.0.0-alpha10'
implementation 'androidx.compose.compiler:compiler:1.0.0-beta07'
implementation 'androidx.lifecycle:lifecycle-runtime:2.3.1'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-common-java8:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-savedstate:2.3.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2'
implementation 'androidx.navigation:navigation-fragment-ktx:2.4.0-alpha05'
implementation 'androidx.navigation:navigation-ui-ktx:2.4.0-alpha05'
implementation 'androidx.navigation:navigation-compose:2.4.0-alpha05'
implementation 'androidx.compose.runtime:runtime:1.0.0-alpha10'
implementation 'androidx.compose.compiler:compiler:1.0.0-beta07'
implementation 'androidx.lifecycle:lifecycle-runtime:2.3.1'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-common-java8:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-savedstate:2.3.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2'
implementation 'androidx.navigation:navigation-fragment-ktx:2.4.0-alpha05'
implementation 'androidx.navigation:navigation-ui-ktx:2.4.0-alpha05'
implementation 'androidx.navigation:navigation-compose:2.4.0-alpha05'
implementation 'androidx.compose.runtime:runtime:1.0.0-alpha10'
implementation 'androidx.compose.compiler:compiler:1.0.0-beta07'
implementation 'androidx.lifecycle:lifecycle-runtime:2.3.1'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-common-java8:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-viewmodel-savedstate:2.3.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
implementation 'org.jetbrains.kotlin