Java 新布局没有'；不会突然出现

我正在android Studio中制作一个应用程序，如果你在手机上打开该应用程序，你会看到Launcer的活动。我有一个按钮，它会将您发送到游戏所在的新活动。单击开始按钮后，应用程序关闭，不会转到其他活动。为什么呢

这是我的启动程序活动代码：

package joenio.sirname;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class SirName_launcher extends AppCompatActivity {

public static Button button_start;

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

public void StartButton(){
    button_start = (Button) findViewById(R.id.button_start);

    button_start.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    Intent intent1 = new Intent("joenio.sirname.Game");
                    startActivity(intent1);
                }

            }
    );



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

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
 }
}

package joenio.sirname;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;
import android.widget.Toast;


public class Game extends AppCompatActivity {
    public static EditText editText_surname;
    public static TextView textView_name;
    public static Button button_check;

int x =0; //to keep track of qustions






//Context editText_this = this;

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


    final ArrayList<String> mQuestionList = new ArrayList<>();


    mQuestionList.add("1+2");
    mQuestionList.add("6+8");
    mQuestionList.add("5 * 6");
    mQuestionList.add("8*5");
    mQuestionList.add("6+16");
    mQuestionList.add("18-5");



    textView_displayquestion.setText((mQuestionList.get(x)));//displayquestion is textview




    final ArrayList<String> mAnswerList=new ArrayList<>();

    mAnswerList.add("3");
    mAnswerList.add("14");
    mAnswerList.add("30");
    mAnswerList.add("40");
    mAnswerList.add("22");
    mAnswerList.add("13");






    //button_check is the button when user click it will first check answer and than move to next question if answer is correct


    button_check.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            //editText_this;
            String answer = editText_ans.getText().toString();
            if (answer.equals(mAnswerList.get(x))) {
                x = x + 1;
                textView_displayquestion.setText(mQuestionList.get(x)); //answer is correct display next quesion
                Toast.makeText(getApplication().getBaseContext(),
                        (R.string.Nice), Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(getApplication().getBaseContext(),
                        (R.string.tryagain), Toast.LENGTH_SHORT).show();

            }
        }
    });


    }
}

这是第二个活动的代码：

package joenio.sirname;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class SirName_launcher extends AppCompatActivity {

public static Button button_start;

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

public void StartButton(){
    button_start = (Button) findViewById(R.id.button_start);

    button_start.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    Intent intent1 = new Intent("joenio.sirname.Game");
                    startActivity(intent1);
                }

            }
    );



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

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
 }
}

package joenio.sirname;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;
import android.widget.Toast;


public class Game extends AppCompatActivity {
    public static EditText editText_surname;
    public static TextView textView_name;
    public static Button button_check;

int x =0; //to keep track of qustions






//Context editText_this = this;

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


    final ArrayList<String> mQuestionList = new ArrayList<>();


    mQuestionList.add("1+2");
    mQuestionList.add("6+8");
    mQuestionList.add("5 * 6");
    mQuestionList.add("8*5");
    mQuestionList.add("6+16");
    mQuestionList.add("18-5");



    textView_displayquestion.setText((mQuestionList.get(x)));//displayquestion is textview




    final ArrayList<String> mAnswerList=new ArrayList<>();

    mAnswerList.add("3");
    mAnswerList.add("14");
    mAnswerList.add("30");
    mAnswerList.add("40");
    mAnswerList.add("22");
    mAnswerList.add("13");






    //button_check is the button when user click it will first check answer and than move to next question if answer is correct


    button_check.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            //editText_this;
            String answer = editText_ans.getText().toString();
            if (answer.equals(mAnswerList.get(x))) {
                x = x + 1;
                textView_displayquestion.setText(mQuestionList.get(x)); //answer is correct display next quesion
                Toast.makeText(getApplication().getBaseContext(),
                        (R.string.Nice), Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(getApplication().getBaseContext(),
                        (R.string.tryagain), Toast.LENGTH_SHORT).show();

            }
        }
    });


    }
}

package joenio.sirname；
导入android.os.Bundle；
导入android.support.v7.app.AppActivity；
导入android.view.view；
导入android.widget.Button；
导入android.widget.EditText；
导入android.widget.TextView；
导入java.util.ArrayList；
导入android.widget.Toast；
公共类游戏扩展应用程序活动{
公共静态EditText EditText_姓氏；
公共静态文本视图文本视图_名称；
公共静态按钮检查；
int x=0；//用于跟踪问题
//上下文编辑文本\u this=此；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_游戏）；
显示问题（）；
}
公共问题{
最终ArrayList mQuestionList=新ArrayList（）；
添加（“1+2”）；
添加（“6+8”）；
mQuestionList.add（“5*6”）；
mQuestionList.add（“8*5”）；
添加（“6+16”）；
mQuestionList.add（“18-5”）；
textView_displayquestion.setText（（mQuestionList.get（x））；//displayquestion是textView
最终ArrayList mAnswerList=新ArrayList（）；
mAnswerList.添加（“3”）；
mAnswerList.添加（“14”）；
mAnswerList.添加（“30”）；
mAnswerList.添加（“40”）；
mAnswerList.添加（“22”）；
mAnswerList.添加（“13”）；
//按钮\u check是当用户单击它时，它将首先检查答案，然后移动到下一个问题，如果答案是正确的
按钮\u check.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
//编辑这个；
String answer=editText_ans.getText（）.toString（）；
if（answer.equals（mAnswerList.get（x）））{
x=x+1；
textView_displayquestion.setText（mQuestionList.get（x））；//答案正确显示下一个问题
Toast.makeText（getApplication（）.getBaseContext（），
（R.string.Nice）、Toast.LENGTH_SHORT）.show（）；
}否则{
Toast.makeText（getApplication（）.getBaseContext（），
（R.string.tryagain），Toast.LENGTH_SHORT.show（）；
}
}
});
}
}

在您的按钮中单击，按如下所示更改代码

Intent intent1 = new Intent(SirName_launcher.this, Game.class);
startActivity(intent1);

---

也可以在清单文件中添加新的游戏活动。

在按钮单击中，按如下所示更改代码

Intent intent1 = new Intent(SirName_launcher.this, Game.class);
startActivity(intent1);

---

还可以在清单文件中添加新的游戏活动。

初始化

TextView

和

按钮时，您不在任何位置，这一定会导致
NullPointerException

像这样更改您的
游戏
活动

TextView textView_displayquestion;
Button button_check;
EditText editText_ans;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_game);
    textView_displayquestion = (TextView)findViewById(R.id.displayquestion); //change as per your id
    button_check = (Button)findViewById(R.id.buttoncheck); //change as per your id
    editText_ans = (EditText)findViewById(R.id.answer); //change as per your id
    Displayquestions();
}

您无法初始化
文本视图
和
按钮
，这必须导致
空点异常

像这样更改您的
游戏
活动

TextView textView_displayquestion;
Button button_check;
EditText editText_ans;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_game);
    textView_displayquestion = (TextView)findViewById(R.id.displayquestion); //change as per your id
    button_check = (Button)findViewById(R.id.buttoncheck); //change as per your id
    editText_ans = (EditText)findViewById(R.id.answer); //change as per your id
    Displayquestions();
}

你能发布你的日志吗？你能发布你的日志吗？非常感谢！！我忘了那部分！非常感谢你！！我忘了那部分！