不确定EditText或KeyEvent是否未侦听或是XML问题

Question

我正在尝试制作一个游戏，但我需要用户在从主活动跳到活动2之前填写用户名。如果用户名为空，则不会执行任何操作。如果用户名至少有一个字母，它将启动第二个活动。在我的情况下，它永远不会起作用，我不知道我做错了什么。这是我的密码。

MainActivity.java

public class MainActivity extends AppCompatActivity {
    EditText et1;
    TextView tv1;
    String usuario;

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

        et1 = findViewById(R.id.et1);
        tv1 = findViewById(R.id.tv1);

        /*Button next = findViewById(R.id.boton);
        next.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent myIntent = new Intent(view.getContext(), MainActivity2.class);
                startActivity(myIntent);
            }
        });*/

        et1.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                usuario = et1.getText().toString();
                if(et1.getText().toString().trim().length() > 0) {
                    if((event.getAction() == KeyEvent.ACTION_DOWN) && (event.getAction() == KeyEvent.KEYCODE_ENTER)) {
                        startActivity2();
                    }
                }
                return false;
            }
        });


    }
 public boolean startActivity2(){
        Intent myIntent = new Intent(this, MainActivity2.class);
        startActivity(myIntent);
        return false;
    }

还有activity_main.xml

<RelativeLayout 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">

    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/texto"
        android:layout_centerVertical="true"
        android:layout_marginRight="50dp"
        android:layout_marginLeft="50dp"
        android:background="#ff8200"
        android:layout_marginEnd="50dp"
        android:layout_marginStart="50dp" />

    <Button
        android:id="@+id/boton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="jump"
        android:layout_below="@+id/tv1"/>

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/et1"
        android:ems="7"
        android:inputType="text"
        android:maxLines="1"
        android:maxLength="11"
        android:layout_toRightOf="@+id/tv1"
        android:layout_centerInParent="true"/>
</RelativeLayout>

我尝试了ifs！isEmpty（），trim（）！等于，绝对没有。

这是舱单，如果需要的话。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.juegocartas3">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.JuegoCartas3">
        <activity
            android:name=".MainActivity3"
            android:exported="false" />
        <activity
            android:name=".MainActivity2"
            android:exported="false" />
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


    </application>

</manifest>

Answer 1

试试这个-

public class MainActivity extends AppCompatActivity {
    EditText et1;
    TextView tv1;
    String usuario;

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

        
        et1 = findViewById(R.id.et1);
        tv1 = findViewById(R.id.tv1);

        et1.setOnEditorActionListener(new TextView.OnEditorActionListener() {

            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {

                if ((actionId & EditorInfo.IME_MASK_ACTION) == EditorInfo.IME_ACTION_DONE) {
                    usuario = et1.getText().toString();

                    if (usuario.trim().length() > 0) {
                        startActivity2();
                    } else {
                        Toast.makeText(getApplicationContext(), " Please add User name", Toast.LENGTH_LONG).show();
                    }
                    return true;
                }
                return false;
            }
        });

   public void startActivity2() {
  Intent myIntent = new Intent(this, MainActivity2.class);
        startActivity(myIntent);
}}