使用Firebase数据库时释放了背景粘性并发标记清除GC

Question

我正在为物联网设备开发应用程序。我的应用程序具有不同的活动，用于从不同的传感器获取数据。每个活动都通过单击按钮接收数据。每当我按下按钮时，都会出现以下错误。

 confirm2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                // Get your custom_toast.xml layout
                LayoutInflater inflater = getLayoutInflater();

                final View layout = inflater.inflate(R.layout.custom_toast,
                        (ViewGroup) findViewById(R.id.custom_toast_layout_id));

                //Initializing the text views
                EditText editText =  findViewById(R.id.link2);
                final String link2 = editText.getText().toString();

                EditText editText1 =  findViewById(R.id.idvalue);
                final String StringValue = editText1.getText().toString();


                //Adding functionality to the text views
                fire2 = new Firebase("https://iotsense.firebaseio.com/");
                Firebase fireChild = fire2.child(link2+"/S1");
                fireChild.setValue("4");

                // Read from the database
                myRef = FirebaseDatabase.getInstance().getReference();
                myRef.addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        // This method is called once with the initial value and again
                        // whenever data at this location is updated.

                        if(StringValue.length()>0 && link2.length()>0) {

                            try {
                            status = dataSnapshot.child(link2 + "/Analog").getValue().toString();}
                            catch (NullPointerException ignored){}

                            if(status==null){
                                TextView text4 = layout.findViewById(R.id.text4);
                                text4.setText(" Error: Wrong ID. ");
                                // Toast...
                                Toast toast = new Toast(getApplicationContext());
                                toast.setGravity(Gravity.CENTER_VERTICAL, 0, 540);
                                toast.setDuration(Toast.LENGTH_LONG);
                                toast.setView(layout);
                                toast.show();
                                return;
                            }
                            else {
                                analogvalue = Integer.parseInt(status);

                                pin.setText(status);

                                final int value = Integer.parseInt(StringValue);
                                if (analogvalue > value) {
                                    Firebase fireChild = fire2.child(link2 + "/Pin1");
                                    fireChild.setValue(spinner1.getSelectedItem().toString());
                                    Firebase fireChild1 = fire2.child(link2 + "/Pin2");
                                    fireChild1.setValue(spinner2.getSelectedItem().toString());

                                }
                                if (analogvalue <= value) {
                                    if(spinner1.getSelectedItem().toString().equals("HIGH")){Firebase fireChild = fire2.child(link2 + "/Pin1"); fireChild.setValue("LOW");}
                                    if(spinner1.getSelectedItem().toString().equals("LOW")) {Firebase fireChild = fire2.child(link2 + "/Pin1"); fireChild.setValue("HIGH");}
                                    if(spinner2.getSelectedItem().toString().equals("HIGH")){Firebase fireChild = fire2.child(link2 + "/Pin2"); fireChild.setValue("LOW");}
                                    if(spinner2.getSelectedItem().toString().equals("LOW")) {Firebase fireChild = fire2.child(link2 + "/Pin2"); fireChild.setValue("HIGH");}
                                }
                            }
                        }
                    }

I/art: Background sticky concurrent mark sweep GC freed 132932(5MB) AllocSpace objects, 21(744KB) LOS objects, 13% free, 35MB/40MB, paused 1.556ms total 109.059ms
I/art: Background sticky concurrent mark sweep GC freed 94569(3MB) AllocSpace objects, 0(0B) LOS objects, 5% free, 38MB/40MB, paused 8.078ms total 68.990ms
I/art: Background sticky concurrent mark sweep GC freed 101736(3MB) AllocSpace objects, 0(0B) LOS objects, 3% free, 39MB/40MB, paused 5.349ms total 81.087ms
I/art: Background sticky concurrent mark sweep GC freed 48181(1662KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 40MB/40MB, paused 5.361ms total 56.784ms

Answer 1

您在onClick上做了很多工作，当您单击按钮时会做所有相同的事情。

可能会导致不必要的内存分配，因此您正在执行很多GC，如您所见。

我建议您在onClick内移动一些代码，例如

• 获得类似于findViewById之类的视图的代码，还包含视图变量

• 您无需动态更改的Firebase代码

• 用于实例化和设置敬酒消息的代码