小编IO *_*evs的帖子

我正在尝试为我的 android 应用程序中的不同路径设置动画矢量路径以进行测试，但它无法正常工作。屏幕上不显示动画，也不显示任何动画。

我的矢量文件是：

    <vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="8dp"
    android:height="5dp"
    android:viewportWidth="8"
    android:viewportHeight="5">
  <path
      android:name="redot"
      android:pathData="M2.5,2.5L6,2.5"
      android:strokeWidth="4"
      android:fillColor="#00000000"
      android:strokeColor="#E61B1B"
      android:fillType="evenOdd"
      android:strokeLineCap="round"/>
</vector>

我的 VectorAnimation 文件是：

    <?xml version="1.0" encoding="utf-8"?>
    <animated-vector xmlns:tools="http://schemas.android.com/tools"
        xmlns:android="http://schemas.android.com/apk/res/android"
        tools:targetApi="lollipop"
        android:drawable="@drawable/ic_reddot">


        <target
            android:animation="@anim/redanim"
            android:name="redot"/>

    </animated-vector>

我在 anim 文件夹中的动画文件是：

<?xml version="1.0" encoding="utf-8"?>

    <set xmlns:android="http://schemas.android.com/apk/res/android">

        <objectAnimator
            android:duration="10000"
            android:propertyName="pathData"
            android:valueFrom="M2.5,2.5L6,2.5"
            android:valueTo="M2.5,2.5L31,2.5"
            android:valueType="pathType" />

    </set>

最后我的 MainActivityCode 如下：

    public class MainActivity extends AppCompatActivity {
    private TextView testObj;
    private ImageView reddot;
    private AnimatedVectorDrawable animation;

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
      // …

我正在开发一个聊天应用程序，我想存储我的消息的时间戳。我的消息数据类是：

import com.google.firebase.firestore.ServerTimestamp;
import java.util.Date;

public class messgaesDataClass {
    private String messageText;
    private int messageStatus;
    private String messagefrom;
    private @ServerTimestamp Date timestamp;

    public messgaesDataClass(String messageText, int messageStatus, String messagefrom, Date time) {
        this.messageText = messageText;
        this.messageStatus = messageStatus;
        this.messagefrom = messagefrom;
        this.time = time;
    }

    public messgaesDataClass() {
    }

    public String getMessageText() {
        return messageText;
    }

    public void setMessageText(String messageText) {
        this.messageText = messageText;
    }

    public int getMessageStatus() {
        return messageStatus;
    }

    public void setMessageStatus(int messageStatus) {
        this.messageStatus = messageStatus; …

我正在使用 Firestore 数据库创建聊天模块。以下是我侦听新消息的侦听器代码：

   mDb.collection("Users_Collection").document(mAuth.getUid()).collection("Recipients")
                .document(psychichObj.getUid()).collection("Messages").orderBy("time").limit(30)
                .addSnapshotListener(MetadataChanges.INCLUDE, new EventListener<QuerySnapshot>() {
                    @Override
                    public void onEvent(@Nullable QuerySnapshot queryDocumentSnapshots, @Nullable FirebaseFirestoreException e) {
                        if (e==null){
                            for (DocumentChange dc:queryDocumentSnapshots.getDocumentChanges()){
                                switch (dc.getType()){
                                    case ADDED:
                                        Log.d("chatevents", "onEvent:Added ");
                                        messgaesDataClass msg = dc.getDocument().toObject(messgaesDataClass.class);
                                        messages.add(msg);
                                        chatAdapter.notifyDataSetChanged();
                                        messagesRecycler.smoothScrollToPosition(messages.size());
                                        break;
                                    case REMOVED:
                                        Log.d("chatevents", "onEvent:Removed ");

                                    case MODIFIED:
                                        Log.d("chatevents", "onEvent:Modiefied ");

                                }
                            }
                        }
                    }
                });

当我发送消息时，我想知道如何侦听本地缓存中的 msg 对象或其元数据处于挂起状态但尚未发送到服务器的消息？