java - 我无法通过单击按钮启动 Activity

Question

我正在尝试通过单击按钮来启动 Activity 。如果用户单击 MenuActivity 中的 PLAY 按钮，则应该启动 GameActivity。但这不起作用。

public class MenuActivity extends AppCompatActivity {

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

public void startGameEngine(View view) {
    Intent myintent = new Intent(this, GameActivity.class);
    startActivity(myintent);
}

这是 GameActivity 类，当用户单击“游戏”按钮时应启动该类。

public class GameActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_game);
    Intent intent = getIntent();
}

这是包含按钮的 menu.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"
    android:background="@color/menubackground_color"
    tools:context="com.example.vincenzoauricchio.example.MenuActivity">

<TextView
    android:id="@+id/textView3"
    android:layout_width="381dp"
    android:layout_height="67dp"
    android:layout_marginBottom="440dp"
    android:layout_marginTop="88dp"
    android:fontFamily="@font/vt323"
    android:text="@string/logo2"
    android:textAlignment="center"
    android:textAllCaps="false"
    android:textColor="@android:color/black"
    android:textSize="36sp"
    android:textStyle="bold|italic"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.666"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.0" />

<Button
    android:id="@+id/btnPlay"
    android:layout_width="100dp"
    android:layout_height="60dp"
    android:layout_marginBottom="265dp"
    android:layout_marginTop="87dp"
    android:fontFamily="@font/vt323"
    android:onClick="startGameEngine"
    android:text="@string/button_play"
    android:textSize="30sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView3"
    app:layout_constraintVertical_bias="0.0" />

Answer 1

尝试实现点击监听器:

public class MenuActivity extends AppCompatActivity implements View.OnClickListener

尝试下面的代码 fragment :

Button btnPlay = (Button) findViewById(R.id.btnPlay);
btnPlay.setOnClickListener(MainActivity.this);

 @Override
 public void onClick(View view)
  {
     if(view == btnPlay)
     {
           Intent intent = new Intent(MenuActivity.this, GameActivity.class);
           startActivity(intent);
     }
  }

将您的 GameActivity 添加到 list 中。