Remove useless example

Author: xiaozhong88

app/src/main/AndroidManifest.xml

@@ -17,7 +17,6 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.OrbbecSdkExamples">
-        <activity android:name=".activity.RecordPlaybackActivity" />
         <activity android:name=".activity.SaveToDiskActivity" />
         <activity android:name=".activity.BasicEnumerateActivity" />
         <activity android:name=".activity.BasicQuickStartActivity" />

app/src/main/java/com/orbbec/orbbecsdkexamples/activity/MainActivity.java

@@ -101,9 +101,6 @@ private void initView() {
         Button syncAlign = findViewById(R.id.btn_advanced_sync_align);
         syncAlign.setOnClickListener(this);
 
-        Button recordPlayback = findViewById(R.id.btn_record_playback);
-        recordPlayback.setOnClickListener(this);
-
         Button saveToDisk = findViewById(R.id.btn_savetodisk);
         saveToDisk.setOnClickListener(this);
     }
@@ -145,8 +142,6 @@ public void onClick(View v) {
             toActivity(AdvancedPostProcessingActivity.class);
         } else if (id == R.id.btn_advanced_sync_align) {
             toActivity(AdvancedSyncAlignActivity.class);
-        }  else if (id == R.id.btn_record_playback) {
-            toActivity(RecordPlaybackActivity.class);
         } else if (id == R.id.btn_savetodisk) {
             toActivity(SaveToDiskActivity.class);
         }