kotlin extensions

Android.md

General

code

### check permission ``` fun Activity.hasPermission(permission: String): Boolean { return ActivityCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED } ```

save() / load() mutable lists

View

visibility

code

```kotlin fun View.visible() { changeViewVisibility(View.VISIBLE) } ```

fun View.gone() {
    changeViewVisibility(View.GONE)   }

fun View.invisible() {
    changeViewVisibility(View.INVISIBLE)    }

private fun View.changeViewVisibility(newState: Int) {
    visibility = newState   }

snackbars

code

fun View.showSmallSnackbar(text: String) { showSnackbar(text, Snackbar.LENGTH_SHORT) }

fun View.showLongSnackbar(text: String) { showSnackbar(text, Snackbar.LENGTH_LONG) }

fun View.showIndefiniteSnackbar(text: String) { showSnackbar(text, Snackbar.LENGTH_INDEFINITE) }

private fun View.showSnackbar(text: String, duration: Int) { Snackbar.make(this, text, duration).show() }

Fragment

code

• To add a fragment using commitNow().

inline fun < reified T: Fragment> FragmentActivity.addFragmentNow(id: Int) {
    val fragment = T::class.java
    supportFragmentManager.beginTransaction().add(id, fragment.newInstance()).commitNow()
}

• To replace a fragment using commitNow().

inline fun < reified T: Fragment> FragmentActivity.replaceFragmentNow(id: Int) {
    val fragment = T::class.java
    supportFragmentManager.beginTransaction().replace(id, fragment.newInstance()).commitNow()
}

• To add a fragment using commit().

inline fun < reified T: Fragment> FragmentActivity.addFragment(id: Int) {
    val fragment = T::class.java
    supportFragmentManager.beginTransaction().add(id, fragment.newInstance()).commit()
}

• To replace a fragment using commit().

inline fun < reified T: Fragment> FragmentActivity.replaceFragment(id: Int) {
    val fragment = T::class.java
    supportFragmentManager.beginTransaction().replace(id, fragment.newInstance()).commit()
}

Context

code

fun Context.showSmallLengthToast(text: String) { showToast(text, Toast.LENGTH_SHORT) }

fun Context.showLongLengthToast(text: String) { showToast(text, Toast.LENGTH_LONG) }

private fun Context.showToast(text:String, duration: Int) { Toast.makeText(this, text, duration).show() }

  </details>

background

code

  fun ViewModel.loadRequest(context:Context, block: suspend () -> Unit): Job {
    return viewModelScope.launch {
        try {
            block()
        }catch (ex: Exception) {
                Toast.makeText(context, ex.message, Toast.LENGTH_LONG).show()
        }
    }
}

suspend fun <T:Any> ControlledRunner<T>.cancelLastThenRun(block: suspend () -> T): T {
    return cancelPreviousThenRun(block)
}

suspend fun <T:Any> ControlledRunner<T>.addLastThenRun(block: suspend () -> T): T {
    return joinPreviousOrRun(block)
}

</details>

Activity

code

package com.himanshu.customktx.extensions.activity

import android.app.Activity import android.content.Intent import android.os.Bundle import android.widget.EditText import android.widget.TextView import androidx.annotation.IdRes import androidx.fragment.app.Fragment import androidx.fragment.app.FragmentActivity

/**

• Extensions used on views using ResId. */ fun Activity.findAndSetTextInTextView(@IdRes id: Int, text: String) { findViewById(id).text = text }

fun Activity.findAndSetTextInEditText(@IdRes id: Int, text: String) { findViewById(id).setText(text) }

/**

• Explicit Intent Extensions. */

/**

• shouldGoTo is used to
• start an intent without any
• extra Bundle(). */ inline fun Activity.shouldGoTo() { makeAnIntent() }

/**

• shouldFinishAndGoTo() finishes the existing
• Activity after the intent is fired. */ inline fun Activity.shouldFinishAndGoTo() { makeAnIntent() finishItOff() }

/**

• shouldGoWithDataTo is used to
• fire an intent with a
• Bundle(). */ inline fun Activity.shouldGoWithDataTo(key:String, bundle: Bundle) { makeAnIntent(key, bundle) }

/**

• shouldFinishAndGoWithDataTo is used to
• finish the existing Activity after an
• intent is fired with Bundle. */ inline fun Activity.shouldFinishAndGoWithDataTo(key:String, bundle: Bundle) { makeAnIntent(key, bundle) finishItOff() }

/**

• Creates an intent with an Activity. */ inline fun Activity.makeAnIntent(key:String? = null, bundle: Bundle? = null) { val intent = Intent(this, T::class.java) intent.putExtra(key, bundle) startActivity(intent) }

/**

• Finishes an Activity. */ fun Activity.finishItOff() { finish() }