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我是Java編程的初學者。我正在使用Android Studio中的顯式意圖。我遇到了一個非常煩人的問題，即當我嘗試使用intent啓動Quiz_activity時，我的應用程序崩潰。 Java代碼和XML似乎都很好。下面是XML和Java：應用程序在使用Explicit Intent時崩潰
<?xml version="1.0" encoding="utf-8"?>
<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:background="@drawable/quiz_front"
android:layout_height="match_parent"
tools:context="com.example.shujah.games.Quiz_front">
<Button
android:id="@+id/start_quiz_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="78dp"
android:text=""
android:background="@android:color/transparent"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
<Button
android:id="@+id/from_quiz_front_to_menu_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:textColor="@color/colorAccent"
android:layout_alignLeft="@+id/start_quiz_btn"
android:layout_alignParentBottom="true"
android:layout_alignStart="@+id/start_quiz_btn"
android:text="BACK" />
</RelativeLayout>
的Java：
public class Quiz_front extends AppCompatActivity {
Button start_quiz;
Button back_to_menu;
Intent i;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz_front);
start_quiz = (Button) findViewById(R.id.start_quiz_btn);
start_quiz.setHighlightColor(Color.DKGRAY);
start_quiz.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
i = new Intent(getApplicationContext(), Quiz_activity.class);
startActivity(i);
}
});
back_to_menu = (Button) findViewById(R.id.from_quiz_front_to_menu_btn);
back_to_menu.setTextColor(Color.WHITE);
back_to_menu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
i = new Intent(getApplicationContext(), MenuActivity.class);
startActivity(i);
}
});
}}
這裏是我想去的活動：
public class Quiz_activity extends AppCompatActivity {
TextView choice1;
TextView choice2;
TextView choice3;
TextView choice4;
TextView num_right;
TextView num_left;
TextView sign;
TextView score;
Random r;
int scor;
Intent ii;
Button back_to_front;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz_activity);
back_to_front.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ii = new Intent(getApplicationContext(), Quiz_front.class);
startActivity(ii);
}
});
choice1 = (TextView) findViewById(R.id.choice1_tv);
choice2 = (TextView) findViewById(R.id.choice2_tv);
choice3 = (TextView) findViewById(R.id.choice3_tv);
choice4 = (TextView) findViewById(R.id.choice4_tv);
num_left = (TextView) findViewById(R.id.left_tv);
num_right = (TextView) findViewById(R.id.right_tv);
score = (TextView) findViewById(R.id.score_tv);
sign = (TextView) findViewById(R.id.sign_tv);
r = new Random();
/* choice1.setTextColor(Color.BLUE);
choice2.setTextColor(Color.BLUE);
choice3.setTextColor(Color.BLUE);
choice4.setTextColor(Color.BLUE);
num_right.setTextColor(Color.YELLOW);
num_left.setTextColor(Color.YELLOW);
sign.setTextColor(Color.YELLOW);*/
}
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<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"
android:background="@drawable/mathquiz"
tools:context="com.example.shujah.games.Quiz_activity">
<TextView
android:id="@+id/right_tv"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_alignParentTop="true"
android:layout_marginTop="75dp"
android:text="TextView"
android:textSize="16sp"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<TextView
android:id="@+id/left_tv"
android:layout_height="50dp"
android:layout_width="wrap_content"
android:textSize="16sp"
android:text="TextView"
android:layout_alignBottom="@+id/right_tv"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:id="@+id/sign_tv"
android:layout_width="100dp"
android:layout_height="90dp"
android:text="TextView"
android:textSize="20sp"
android:layout_centerHorizontal="true"
android:layout_alignBottom="@+id/right_tv" />
<TextView
android:id="@+id/score_tv"
android:layout_width="70dp"
android:layout_height="30dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="TextView" />
<TextView
android:id="@+id/choice1_tv"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_marginEnd="30dp"
android:layout_marginRight="30dp"
android:text="TextView"
android:layout_centerVertical="true"
android:layout_toLeftOf="@+id/sign_tv"
android:layout_toStartOf="@+id/sign_tv" />
<TextView
android:id="@+id/choice3_tv"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginBottom="64dp"
android:text="TextView"
android:layout_alignParentBottom="true"
android:layout_alignLeft="@+id/choice1_tv"
android:layout_alignStart="@+id/choice1_tv"
android:layout_alignRight="@+id/choice1_tv"
android:layout_alignEnd="@+id/choice1_tv" />
<TextView
android:id="@+id/choice2_tv"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:text="TextView"
android:layout_alignBottom="@+id/choice1_tv"
android:layout_alignLeft="@+id/choice4_tv"
android:layout_alignStart="@+id/choice4_tv"
android:layout_marginLeft="13dp"
android:layout_marginStart="13dp" />
<TextView
android:id="@+id/choice4_tv"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:text="TextView"
android:layout_toStartOf="@+id/right_tv"
android:layout_toLeftOf="@+id/right_tv"
android:layout_alignBottom="@+id/choice3_tv" />
<Button
android:id="@+id/back_to_quiz_front"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Back"
android:layout_alignParentBottom="true"
android:layout_toRightOf="@+id/choice1_tv"
android:layout_toEndOf="@+id/choice1_tv" />
</RelativeLayout>
這裏是Android Manifest.XML：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.shujah.games">
<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/AppTheme">
<activity android:name=".MenuActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.example.shujah.games.RPSactivity" />
<activity android:name="com.example.shujah.games.Quiz_activity" />
<activity android:name="com.example.shujah.games.Quiz_front"></activity>
</application>
</manifest>
帖子異常的堆棧跟蹤 –