测试吧

app/src/main/java/com/example/blu/toys/activity/AddDeviceActivity.java

 package com.example.blu.toys.activity;
 
 
+import android.content.Intent;
 import android.os.Bundle;
+import android.widget.Toast;
 
 import androidx.appcompat.widget.AppCompatImageView;
 
@@ -30,6 +32,12 @@ public class AddDeviceActivity extends BaseActivity {
 
 	}
 
+	@Override
+	public void onBackPressed() {
+		this.finish();
+
+	}
+
 	@OnClick(R.id.go_search_ble)
 	public void onViewClicked() {
 		goActivity(SearchingActivity.class);

app/src/main/java/com/example/blu/toys/activity/PlayActivity.java

@@ -80,14 +80,16 @@ public class PlayActivity extends BaseActivity {
 				suspendAndContinue=0;
 			}
 			if(suspendAndContinue==1) {
-				computeTime();
+
 				String mHourStr = addZeroForNum(mHour + "", 2);
 				String mMinStr = addZeroForNum(mMin + "", 2);
 				String mSecondStr = addZeroForNum(mSecond + "", 2);
 				typefaceTextView.setText(mHourStr + ":" + mMinStr + ":" + mSecondStr);
 
 			}
+
 			sendBleData();
+			computeTime();
 
 		}
 	};