小编Rad*_*esh的帖子

我的app数据库类

@Database(entities = {Detail.class}, version = Constant.DATABASE_VERSION)
public abstract class AppDatabase extends RoomDatabase {

    private static AppDatabase INSTANCE;

    public abstract FavoritesDao favoritesDao();

    public static AppDatabase getAppDatabase(Context context) {
        if (INSTANCE == null) {
            INSTANCE =
                    Room.databaseBuilder(context.getApplicationContext(), AppDatabase.class, Constant.DATABASE).allowMainThreadQueries().build();

                    //Room.inMemoryDatabaseBuilder(context.getApplicationContext(),AppDatabase.class).allowMainThreadQueries().build();
        }
        return INSTANCE;
    }

    public static void destroyInstance() {
        INSTANCE = null;
    }
}

Gradle lib:

 compile "android.arch.persistence.room:runtime:+"   
 annotationProcessor "android.arch.persistence.room:compiler:+"

当我要求例如它会给出这个错误时,我的应用程序类中不存在AppDatabase_Impl

public class APp extends Application {

    private boolean appRunning = false;

    @Override
    public void onCreate() {
        super.onCreate();
        AppDatabase.getAppDatabase(this); //--AppDatabase_Impl does …

我使用firebase ml kit进行文本识别,但在仿真器和真实设备上给出了这个例外.

W/System.err: com.google.firebase.ml.common.FirebaseMLException: Waiting for the text recognition model to be downloaded. Please wait.
    at com.google.android.gms.internal.firebase_ml.zzjz.zzc(Unknown Source)
    at com.google.android.gms.internal.firebase_ml.zzjz.zza(Unknown Source)
    at com.google.android.gms.internal.firebase_ml.zzic.call(Unknown Source)
    at com.google.android.gms.internal.firebase_ml.zzhx.zza(Unknown Source)
    at com.google.android.gms.internal.firebase_ml.zzhy.run(Unknown Source)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at com.google.android.gms.internal.firebase_ml.zze.dispatchMessage(Unknown Source)
    at android.os.Looper.loop(Looper.java:136)
    at android.os.HandlerThread.run(HandlerThread.java:61)

在这里我的代码

private fun MlProcessText(imageUri:Uri) {
    val bitmap = MediaStore.Images.Media.getBitmap(contentResolver, imageUri)
    val textVision = FirebaseVisionImage.fromBitmap(bitmap)
    val detector = FirebaseVision.getInstance().onDeviceTextRecognizer

    detector.processImage(textVision).addOnSuccessListener { it ->
        val blocks = it.textBlocks
        if (blocks.size == 0 ){

            tvVision.text = "NO TEXT"
        }else{
            blocks.forEach { …

我有一个活动,当设备在横向时从浏览器打开让我低于错误

java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation

表现

<activity android:name=".Activity.MyActivity"
        android:configChanges="orientation"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.Theme_Slide"
        >
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />

            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />

            <data
                android:host="xxx"
                android:scheme="xxx" />
            <data
                android:host="xxx"
                android:scheme="xxx" />
        </intent-filter>
    </activity>

style.xml

<style name="AppTheme.Theme_Slide" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowCloseOnTouchOutside">false</item>
</style>

我有两个活动,A和B. A调用了B startActivityForResult().B有主题@android:style/Theme.Dialog.

因此,B显示在"A"之上,但A仍然可见(因为B是对话框).

当两个活动都启动时,我通过切换到另一个任务并返回来强制重新创建(我在android开发人员设置中启用了"不要保持活动"选项.当我返回到我的任务时,我看到在A和B上调用OnCreate .)

当我点击活动B按钮,它调用setResult()和finish(),但onActivityResult() 不叫上.

问题没有出现

• 如果我不强制重新开展活动

要么

• 如果我从活动B中删除对话框主题.

我在使用Android 9的Google Pixel上测试了这个.

这是预期的行为还是Android中的错误？

这是我用来测试它的代码(Xamarin Android):

[Activity(Label = "@string/app_name")]
public class ActivityA : Activity
{

    protected override void OnCreate(Bundle savedInstanceState)
    {
        Kp2aLog.Log("OnCreate A");
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.yubichall_test);

        {
            FindViewById<Button>(Resource.Id.btn_yubichall).Text = "Start B";
            FindViewById<Button>(Resource.Id.btn_yubichall).Click += (sender, args) =>
            {

                var chalIntent = new Intent(this, typeof(ActivityB));

                StartActivityForResult(chalIntent, 123);

            };
        }


    }

    protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
    {
        base.OnActivityResult(requestCode, resultCode, …

setDefaults 在Android O及更高版本（SDK> = 26）中，Notification.Builder中的版本已弃用

也 setSound

这是我的代码

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        b.setAutoCancel(true)
                .setSmallIcon(R.drawable.ic_luncher_new)
                .setContentTitle(Title)
                .setTicker(Title)
                .setContentText(Msg)
                .setChannelId("cid")
                .setDefaults(Notification.DEFAULT_ALL)
                .setStyle(new Notification.BigTextStyle().bigText(Msg))
                .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
                .setContentIntent(contentIntent);
    }
NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        notificationManager.createNotificationChannel(mChannel);
    }
    notificationManager.notify(id, b.build());`

我应该更换什么？我找不到任何有用的例子