Question

我正在为Android开发一个聊天应用程序。它具有用于显示聊天的列表视图，用于输入文本的EditText和用于发送文本的按钮。每当启动活动时，键盘就会自动出现。但是，当我通过按“后退”按钮取消键盘时，单击EditText时键盘不会重新出现。我尝试将focusable属性添加到edittext，但是没有用。请告诉我我在做什么错。

XML文件：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:id="@+id/main_activity"
    >

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatingActionButton3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginBottom="12dp"
        android:clickable="true"
        android:focusable="true"
        app:backgroundTint="@color/colorPrimary"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@android:drawable/ic_menu_send" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="260dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginBottom="16dp"
        android:ems="10"
        android:hint="Type here"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:inputType="textCapSentences"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/floatingActionButton3"
        app:layout_constraintHorizontal_bias="0.472"
        app:layout_constraintStart_toStartOf="parent" />

    <ListView
        android:id="@+id/messages"
        android:layout_width="395dp"
        android:layout_height="647dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/floatingActionButton3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

ActivityMain.java文件：

public class MainActivity extends AppCompatActivity {

    private static int SIGN_IN_REQUEST_CODE = 1;
    private FirebaseListAdapter<ChatMessage> adapter;
    RelativeLayout mainActivity;
    FloatingActionButton fab;

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(item.getItemId() == R.id.sign_out_menu)
        {
            AuthUI.getInstance().signOut(this).addOnCompleteListener(new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    Snackbar.make(mainActivity,"Signed out successfully",Snackbar.LENGTH_SHORT).show();
                    finish();
                }
            });
        }
        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu,menu);
        return true;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        if(requestCode == SIGN_IN_REQUEST_CODE)
        {
            if(resultCode == RESULT_OK)
            {
                Snackbar.make(mainActivity,"Welcome " + FirebaseAuth.getInstance().getCurrentUser().getEmail(),Snackbar.LENGTH_SHORT).show();
                displayChatMessages();
            }
            else
            {
                Snackbar.make(mainActivity,"Login failed.",Snackbar.LENGTH_SHORT).show();
                finish();
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        fab = findViewById(R.id.floatingActionButton3);
        mainActivity = findViewById(R.id.main_activity);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EditText editText = findViewById(R.id.editText);
                FirebaseDatabase.getInstance().getReference().push().setValue(new ChatMessage(
                        FirebaseAuth.getInstance().getCurrentUser().getEmail(),
                        editText.getText().toString()
                ));
                editText.setText("");
            }
        });

        if(FirebaseAuth.getInstance().getCurrentUser() == null)
        {
            startActivityForResult(AuthUI.getInstance().createSignInIntentBuilder().build(),SIGN_IN_REQUEST_CODE);
        }
        else
        {
            Snackbar.make(mainActivity,"Welcome back " + FirebaseAuth.getInstance().getCurrentUser().getEmail(),Snackbar.LENGTH_SHORT).show();
            displayChatMessages();
        }
    }


    Query query = FirebaseDatabase.getInstance().getReference().child("chats");
    FirebaseListOptions<ChatMessage> options = new FirebaseListOptions.Builder<ChatMessage>()
            .setQuery(query,ChatMessage.class)
            .setLayout(R.layout.list_item)
            .build();
    private void displayChatMessages()
    {
        ListView listView = findViewById(R.id.messages);
        adapter = new FirebaseListAdapter<ChatMessage>(options) {
            @Override
            protected void populateView(@NonNull View v, @NonNull ChatMessage model, int position) {

                TextView textView = v.findViewById(R.id.username);
                TextView textView1 = v.findViewById(R.id.messageText);
                TextView textView2 = v.findViewById(R.id.time);

                textView.setText(model.getUsername());
                textView1.setText(model.getMessageText());
                textView2.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)",model.getTime()));
            }
        };
        listView.setAdapter(adapter);
    }
}

Answer 1

尝试：

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);

或

 InputMethodManager im = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
 im.showSoftInput(edittext, 0);

单击时EditText不显示键盘

1 个答案: