java - 打开新 Intent 时 Android 应用程序崩溃

Question

我是 Android 编程新手。我一直在使用 eclipse 并尝试开发一个两人井字棋游戏，但是每当玩家获胜时该应用程序就会崩溃。我尝试打开一个新 Activity - 一个对话框显示玩家 x 获胜，两个按钮显示再次播放或退出。 PlayerOne 和 PlayerTwo 类只是将内容 View 设置为对话框。我尝试在 startActivity 方法周围放置 try 和 catch，但没有任何反应，我连续得到三个 X 或 O，游戏只是继续运行，没有显示任何对话框。那么有人可以帮助我吗？这是我的代码:

package com.rohan.tictactoe;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Main extends Activity implements OnClickListener{
    Button t1,t2,t3,t4,t5,t6,t7,t8,t9;
    int turn = 1;
    int status = 0;
    String s1,s2,s3,s4,s5,s6,s7,s8,s9 = "";
    Intent i = new Intent("com.rohan.tictactoe.PlayerOne");
   Intent x = new Intent("com.rohan.tictactoe.PlayerTwo");
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       initiallize();
   }

   @Override
   public void onClick(View v) {
       switch(v.getId()){
       case R.id.t1:
            if (turn ==1){
            t1.setText("X");
            turn =2;
            s1 = "X";
            }
        else if(turn == 2){
            t1.setText("O");
            turn =1;
            s1= "O";
        }
        winner();
        break;
    case R.id.t2:
        if (turn ==1){
            t2.setText("X");
            turn =2;
            s2 = "X";
        }
        else if(turn == 2){
            t2.setText("O");
            turn =1;
            s2 = "O";
        }
        winner();
        break;
    case R.id.t3:
        if (turn ==1){
            t3.setText("X");
            turn =2;
            s3 = "X";
        }
        else if(turn == 2){
            t3.setText("O");
            turn =1;
            s3 = "O";
        }
        winner();
        break;
    case R.id.t4:
        if (turn ==1){
            t4.setText("X");
            turn =2;
            s4 = "X";
            t4.setEnabled(false);
        }
        else if(turn == 2){
            t4.setText("O");
            turn =1;
            s4 = "O";
            t4.setEnabled(false);
        }
        winner();
        break;
    case R.id.t5:
        if (turn ==1){
            t5.setText("X");
            turn =2;
            s5 = "X";
            t5.setEnabled(false);
        }
        else if(turn == 2){
            t5.setText("O");
            turn =1;
            s5 = "O";
            t5.setEnabled(false);
        }
        winner();
        break;
    case R.id.t6:
        if (turn ==1){
            t6.setText("X");
            turn =2;
            s6 = "X";
            t6.setEnabled(false);
        }
        else if(turn == 2){
            t6.setText("O");
            turn =1;
            s6 = "O";
            t6.setEnabled(false);
        }
        winner();
        break;
    case R.id.t7:
        if (turn ==1){
            t7.setText("X");
            turn =2;
            s7 = "X";
            t7.setEnabled(false);
        }
        else if(turn == 2){
            t7.setText("O");
            turn =1;
            s7 = "O";
            t7.setEnabled(false);
        }
        winner();
        break;
    case R.id.t8:
        if (turn ==1){
            t8.setText("X");
            turn =2;
            s8 = "X";
            t8.setEnabled(false);
        }
        else if(turn == 2){
            t8.setText("O");
            turn =1;
            s8 = "O";
            t8.setEnabled(false);
        }
        winner();
        break;
    case R.id.t9:
        if (turn ==1){
            t9.setText("X");
            turn =2;
            s9 = "X";
            t9.setEnabled(false);
        }
        else if(turn == 2){
            t9.setText("O");
            turn =1;
            s9 = "O";
            t9.setEnabled(false);
        }
        winner();
        break;
    }

}
public void winner(){
    if (s1 == s2 && s2 == s3 && s3 =="X"){
        startActivity(i);
    }
    else if(s1 == s2 && s2 == s3 && s3 =="O"){
        startActivity(x);
    }
    else if(s4 == s5 && s5 == s6 && s6 =="X"){
        startActivity(i);
    }
    else if(s4 == s5 && s5 == s6 && s6 =="O"){
        startActivity(x);
    }
    else if(s7 == s8 && s8 == s9 && s9 =="X"){
        startActivity(i);
    }
    else if(s7 == s8 && s8 == s9 && s9 =="O"){
        startActivity(x);
    }
    else if(s1 == s4 && s4 == s7 && s7 =="X"){
        startActivity(i);
    }
    else if(s1 == s4 && s4 == s7 && s7 =="O"){
        startActivity(x);
    }
    else if(s2 == s5 && s5 == s8 && s8 =="X"){
        startActivity(i);
    }
    else if(s2 == s5 && s5 == s8 && s8 =="O"){
        startActivity(x);
    }
    else if(s3 == s6 && s6 == s9 && s9 =="X"){
        startActivity(i);
    }
    else if(s3 == s6 && s6 == s9 && s9 =="O"){
        startActivity(x);
    }
    else if(s1 == s5 && s5 == s9 && s9 =="X"){
        startActivity(i);
    }
    else if(s1 == s5 && s5 == s9 && s9 =="O"){
        startActivity(x);
    }
    else if(s3 == s5 && s5 == s7 && s7 =="X"){
        startActivity(i);
    }
    else if(s3 == s5 && s5 == s7 && s7 =="O"){
        startActivity(x);
    }else{

    }

}

public void initiallize(){
    t1 = (Button) findViewById(R.id.t1);
    t2 = (Button) findViewById(R.id.t2);
    t3 = (Button) findViewById(R.id.t3);
    t4 = (Button) findViewById(R.id.t4);
    t5 = (Button) findViewById(R.id.t5);
    t6 = (Button) findViewById(R.id.t6);
    t7 = (Button) findViewById(R.id.t7);
    t8 = (Button) findViewById(R.id.t8);
    t9 = (Button) findViewById(R.id.t9);

    t1.setOnClickListener(this);
    t2.setOnClickListener(this);
    t3.setOnClickListener(this);
    t4.setOnClickListener(this);
    t5.setOnClickListener(this);
    t6.setOnClickListener(this);
    t7.setOnClickListener(this);
    t8.setOnClickListener(this);
    t9.setOnClickListener(this);
 }


}

Answer 1

有两件事，当你初始化 Intent 时，你使用 Intent(String action) 作为构造函数。 com.rohan.tictactoe.PlayerOne 是一个 Action 吗？是你的类(class)吗？如果这是一个类，你真的不应该这样做。

试试这个:

public void winner(){
    Intent i = new Intent(this, PlayerOne.class);
    Intent x = new Intent(this, PlayerTwo.class);

    //blahblah rest of your code
}

其次，您需要将 Activity 添加到 AndroidManifest.xml 中才能使其正常工作。在 AndroidManifest.xml 中，您必须在应用程序标记之间添加以下内容:

<activity android:name=".PlayerOne"/>
<activity android:name=".PlayerTwo"/>