开始另一个活动时我的 apk 停止了

Question

我是安卓开发新手。我试图通过单击按钮打开第二个活动，但是当我尝试我的 apk 时停止了。有人可以帮我找出我的错误。以下是我的代码

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.pradeep.findme">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true">
    <activity
        android:name=".MainActivity"
        android:screenOrientation="landscape">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".MainPlayActivity"
        android:screenOrientation="landscape"
        android:parentActivityName=".MainActivity">

    </activity>
</application>
</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.pradeep.findme.MainActivity"
android:background="@drawable/uibg"
android:theme="@android:style/Theme.Wallpaper.NoTitleBar.Fullscreen"
>
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"        >
    <Button
        android:layout_width="90dp"
        android:layout_height="50dp"
        android:id="@+id/pbutton"
        android:background="@drawable/play"
        android:textColor="#0760db"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        />
    <Button
        android:layout_width="90dp"
        android:layout_height="50dp"
        android:id="@+id/ibutton"
        android:layout_gravity="bottom"
        android:background="@drawable/inst"
        android:textColor="#0760db"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@id/pbutton"
        android:layout_marginLeft="10dp"/>
    <Button
        android:layout_width="90dp"
        android:layout_height="50dp"
        android:id="@+id/sbutton"
        android:layout_gravity="bottom"
        android:background="@drawable/story"
        android:textColor="#0760db"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@id/ibutton"
        android:layout_marginLeft="10dp"/>
    <Button
        android:layout_width="90dp"
        android:layout_height="50dp"
        android:id="@+id/ebutton"
        android:layout_gravity="bottom"
        android:background="@drawable/exit"
        android:textColor="#0760db"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@id/sbutton"
        android:layout_marginLeft="10dp"            />
</RelativeLayout>

MainActivity.java

public class MainActivity extends Activity {
Button Quit,Play,Story,Ins;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
    this.setContentView(R.layout.activity_main);

    Quit = (Button)findViewById(R.id.ebutton);
    Play= (Button)findViewById(R.id.pbutton);
    Story= (Button)findViewById(R.id.sbutton);
    Ins= (Button)findViewById(R.id.ibutton);

    Quit.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            finish();
        }
    });

    Play.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v){
            Intent intent = new Intent(getApplicationContext(), MainPlayActivity.class);
            startActivity(intent);
        }
    });

}
}

activity_main_play.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.pradeep.findme.MainPlayActivity"
android:background="@drawable/room2"
android:id="@+id/playscreen"
android:theme="@android:style/Theme.Wallpaper.NoTitleBar.Fullscreen">
</RelativeLayout>

MainPlayActivity.java

public class MainPlayActivity extends AppCompatActivity {

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

Answer 1

您忘记应用主题了。 将android:theme="@style/AppTheme" 放入您的清单文件中，例如：

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

Answer 2

我看到你使用R.layout.activity_main_play 什么是R.layout.activity_main_play？

可能的解决方案： 将SecondActivity.xml 重命名为activity_main_play.xml

但首先你应该看看错误日志。