Use the "Activity Compose" framework in the Java library for visual programming
Use the "Activity Compose" framework in the Java library for visual programming
In the Java library, we can use the "Activity Compose" framework for visual programming.Activity Compose is a Java -based programming framework that can help developers create a user interface easier and make the design and development process of the application easier and efficient.
The first step of using the Activity Compose framework for visual programming is to introduce related dependencies.You can add the following dependencies to the construction document of the project:
gradle
implementation 'androidx.activity:activity-compose:1.3.1'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.4.0'
implementation 'androidx.compose.ui:ui:1.1.0'
implementation 'androidx.compose.material:material:1.1.0'
Next, we need to create an Activity and use the annotation of `@@AndroidERYPoint` to enable HILT dependency injection.This can ensure that the Activity Compose and the HILT framework work together.
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Column
import androidx.compose.material.Button
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import dagger.hilt.android.AndroidEntryPoint
@AndroidEntryPoint
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
MyApp()
}
}
@Composable
fun MyApp() {
val context = LocalContext.current
Column(modifier = Modifier.padding(16.dp)) {
Text (text = "Welcome to use the Activity Compose framework for visual programming!", Style = materialtheme.typography.h4)
Button(onClick = { showToast(context, "Hello Compose!") }) {
Text (text = "click button")
}
}
}
private fun showToast(context: Context, message: String) {
Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
}
}
In the above code, we create a simple Activity and use the `MyApp` function in the` SetContent` method to set the Compose content.`MyApp` function is a combined function (composable) to build a user interface.We can use the various components of Compose in this function to create a custom interface.
In the above example, we use the `column` component to create a vertical arrangement layout, and add a text and a button to it.When the button is clicked, the `showtoast` function is triggered to display a message prompt box.
It is worth noting that when using the Activity Compose framework, we can directly access the `LocalContext` to obtain the current Activity context, and you can use various components and styles in the compose library to design the interface.
In addition to the settings in the code, we also need to declare the MainActivity in the Androidmanifest.xml file.For example:
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Through the above steps, we can use the Activity Compose framework in the Java library for visual programming.This method can greatly simplify the UI design and development of the application, improve the readability and maintenance of code, and make developers more focused on achieving core functions.
