小编Sha*_*hal的帖子

I'm following single activity approach. I have navigation toolbar, whenever i go to other screens (fragments) instead of hamburger icon i will have back arrow.

What i want to achieve is, pop my current fragment using action on pressing toolbar back arrow.

I've tried

requireActivity().getOnBackPressedDispatcher().addCallback(this, new OnBackPressedCallback(true) {
    @Override
    public void handleOnBackPressed() {
        NavHostFragment.findNavController(EventDetailsFragment.this)
        .navigate(R.id.action_nav_event_details_to_nav_home);
    }
});

But not getting the call over there, i checked by running app in debug mode.

我正在尝试像这样为通知中的按钮（操作）着色。

到目前为止，这是我迄今为止所取得的成就。

下面是我正在使用的代码

通知服务类

private void showCallNotification(Map<String, String> dataMap) {
        notificationId = (int) (System.currentTimeMillis() % 10000);
        Intent intent = new Intent(getApplicationContext(), ReceiveCallActivity.class)
                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                .setAction(Intent.ACTION_ANSWER)
                .putExtra(AppConstants.CALL_STATUS, AppConstants.CALL_ACCEPTED)
                .putExtra("title", dataMap.get("title"))
                .putExtra("action", dataMap.get("action"));

        Intent cancelIntent = new Intent(getApplicationContext(), VideoCallReceiver.class)
                .setAction(AppConstants.INCOMING_CALL_BROADCAST_ACTION)
                .putExtra(AppConstants.CALL_STATUS, AppConstants.CALL_DECLINED)
                .putExtra("notificationId", notificationId);

        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        PendingIntent cancelPendingIntent = PendingIntent.getBroadcast(this, 0, cancelIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Action declineAction = new NotificationCompat.Action(android.R.drawable.ic_menu_call, getString(R.string.decline_call), cancelPendingIntent);
        NotificationCompat.Action acceptAction = new NotificationCompat.Action(android.R.drawable.ic_menu_call, getString(R.string.accept_call), pendingIntent);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, AppConstants.CALL_CHANNEL_ID)
                .setSmallIcon(R.drawable.ic_notification)
                .setContentTitle(dataMap.get("sender"))
                .setContentText(getString(R.string.incoming_call))
                .setColor(getResources().getColor(R.color.notification_color))
                .setAutoCancel(true) …

这个错误突然开始出现。

Node : v10.16.3
React native : 0.60.5
react-native-cli: 2.0.1

捆绑失败：错误：无法stream从/Users/username/React Native/SampleApp/node_modules/browser-stdout/index.js以下位置解析模块：模块stream在 Haste 模块映射中不存在

它给出了这一行的错误：

var WritableStream = require('stream').Writable

我尝试通过 npm 安装“流”

npm install stream

然后其他类似的错误开始出现。

我在实时应用程序上遇到 UnsupportedOperationException 崩溃。所有崩溃都与 Moto Android 11 设备有关。可以看出它与 onKeyUp 有某种关系。但仍然不知道如何重现或解决这个问题。任何帮助，将不胜感激。

Fatal Exception: java.lang.UnsupportedOperationException: Tried to obtain display from a Context not associated with  one. Only visual Contexts (such as Activity or one created with Context#createWindowContext) or ones created with Context#createDisplayContext are associated with displays. Other types of Contexts are typically related to background entities and may return an arbitrary display.
   at android.app.ContextImpl.getDisplay(ContextImpl.java:2580)
   at android.content.ContextWrapper.getDisplay(ContextWrapper.java:1030)
   at android.content.ContextWrapper.getDisplay(ContextWrapper.java:1030)
   at android.app.Activity.onKeyUp(Activity.java:3859)
   at android.view.KeyEvent.dispatch(KeyEvent.java:2866)
   at android.app.Activity.dispatchKeyEvent(Activity.java:4176)
   at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:122)
   at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:84)
   at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:140)
   at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:558)
   at …

我尝试通过导航抽屉活动创建一个新项目。使用视图模型自动生成片段。单击导航菜单时，它不会导航到相应的片段。

构建.gradle

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.navigation:navigation-fragment:2.0.0'
    implementation 'androidx.navigation:navigation-ui:2.0.0'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}

主Activity.class

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);
        // Passing each menu …