Refactor code of API

Rename Automation API to API
Add API section to READMEs

app/src/main/java/com/bintianqi/owndroid/ApiReceiver.kt

@@ -0,0 +1,51 @@
+package com.bintianqi.owndroid
+
+import android.annotation.SuppressLint
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.util.Log
+import com.bintianqi.owndroid.dpm.getDPM
+import com.bintianqi.owndroid.dpm.getReceiver
+
+class ApiReceiver: BroadcastReceiver() {
+    @SuppressLint("NewApi")
+    override fun onReceive(context: Context, intent: Intent) {
+        val sharedPrefs = context.getSharedPreferences("data", Context.MODE_PRIVATE)
+        if(sharedPrefs.getBoolean("enable_api", false)) return
+        val key = sharedPrefs.getString("api_key", null)
+        if(key != null && key == intent.getStringExtra("key")) {
+            val dpm = context.getDPM()
+            val receiver = context.getReceiver()
+            val app = intent.getStringExtra("package") ?: ""
+            try {
+                val ok = when(intent.action) {
+                    "com.bintianqi.owndroid.action.HIDE" -> dpm.setApplicationHidden(receiver, app, true)
+                    "com.bintianqi.owndroid.action.UNHIDE" -> dpm.setApplicationHidden(receiver, app, false)
+                    "com.bintianqi.owndroid.action.SUSPEND" -> dpm.setPackagesSuspended(receiver, arrayOf(app), true).isEmpty()
+                    "com.bintianqi.owndroid.action.UNSUSPEND" -> dpm.setPackagesSuspended(receiver, arrayOf(app), false).isEmpty()
+                    "com.bintianqi.owndroid.action.LOCK" -> { dpm.lockNow(); true }
+                    else -> {
+                        Log.w(TAG, "Invalid action")
+                        resultData = "Invalid action"
+                        false
+                    }
+                }
+                if(!ok) resultCode = 1
+            } catch(e: Exception) {
+                e.printStackTrace()
+                val message = (e::class.qualifiedName ?: "Exception") + ": " + (e.message ?: "")
+                Log.w(TAG, message)
+                resultCode = 1
+                resultData = message
+            }
+        } else {
+            Log.w(TAG, "Unauthorized")
+            resultCode = 1
+            resultData = "Unauthorized"
+        }
+    }
+    companion object {
+        private const val TAG = "API"
+    }
+}