Fix webview crashing in api 21

twidere/src/main/kotlin/org/mariotaku/twidere/view/LollipopFixedWebView.kt

@@ -0,0 +1,28 @@
+package org.mariotaku.twidere.view
+
+import android.annotation.TargetApi
+import android.content.Context
+import android.os.Build
+import android.util.AttributeSet
+import android.webkit.WebView
+
+private fun Context.fixForLollipop(): Context {
+    return if (Build.VERSION.SDK_INT in 21..22) {
+        applicationContext
+    } else this
+}
+
+class LollipopFixWebView: WebView {
+
+    constructor(context: Context?) : super(context?.fixForLollipop())
+    constructor(context: Context?, attrs: AttributeSet?) : super(context?.fixForLollipop(), attrs)
+    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context?.fixForLollipop(), attrs, defStyleAttr)
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int, defStyleRes: Int) : super(context?.fixForLollipop(), attrs, defStyleAttr, defStyleRes)
+    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int, privateBrowsing: Boolean) : super(context?.fixForLollipop(), attrs, defStyleAttr, privateBrowsing)
+
+    init {
+        isFocusable = true
+        isFocusableInTouchMode = true
+    }
+}

twidere/src/main/res/layout/activity_browser_sign_in.xml

@@ -23,7 +23,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <WebView
+    <org.mariotaku.twidere.view.LollipopFixWebView
         android:id="@+id/webView"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>