我有一个小问题。我正在开发一个小井字游戏。
我有一个开始屏幕，您可以在其中输入玩家名称，并通过 putExtra 将该字符串提供给游戏活动。到目前为止，它的工作原理是，玩家名称显示在游戏活动中。
我现在的问题是：如果一个玩家赢得游戏，“NewGame”按钮就会变得可见。单击时，它应该使用 StartScreen 中给出的相同名称重新启动 Game-Activity。
这是它崩溃的地方。
这是我的代码和logcat：
开始屏幕：
package de.android.pali;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
public class TicTacToeMenu extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tic_tac_toe_menu);
final ImageButton createGame = (ImageButton)findViewById(R.id.newGameButton);
final EditText spieler1 = (EditText)findViewById(R.id.addsp1);
final EditText spieler2 = (EditText)findViewById(R.id.addsp2);
final Intent newGame = new Intent(TicTacToeMenu.this, NewGame.class);
createGame.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
newGame.putExtra("Name1", spieler1.getText().toString());
newGame.putExtra("Name2", spieler2.getText().toString());
startActivity(newGame);
}
});
}
}
游戏活动：
package de.android.pali;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
public class NewGame extends TicTacToeMenu{
int turn = 1;
int[] felder = new int[9];
boolean gotWinner = false;
ImageButton feld1;
ImageButton feld2;
ImageButton feld3;
ImageButton feld4;
ImageButton feld5;
ImageButton feld6;
ImageButton feld7;
ImageButton feld8;
ImageButton feld9;
Button anotherGame;
TextView spieler1;
TextView spieler2;
TextView ergebnis;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.game);
setupUI();
setOnClickListeners(feld1, feld2, feld3, feld4, feld5, feld6, feld7,
feld8, feld9);
}
public void setupUI() {
feld1 = (ImageButton)findViewById(R.id.feld1);
feld2 = (ImageButton)findViewById(R.id.feld2);
feld3 = (ImageButton)findViewById(R.id.feld3);
feld4 = (ImageButton)findViewById(R.id.feld4);
feld5 = (ImageButton)findViewById(R.id.feld5);
feld6 = (ImageButton)findViewById(R.id.feld6);
feld7 = (ImageButton)findViewById(R.id.feld7);
feld8 = (ImageButton)findViewById(R.id.feld8);
feld9 = (ImageButton)findViewById(R.id.feld9);
final TextView spieler1 = (TextView)findViewById(R.id.sp1name);
final TextView spieler2 = (TextView)findViewById(R.id.sp2name);
spieler1.setText(getIntent().getStringExtra("Name1").toString());
spieler2.setText(getIntent().getStringExtra("Name2").toString());
for(int x=0; x<9; x++){felder[x]=2;};
}
public void setOnClickListeners(final ImageButton feld1,
final ImageButton feld2, final ImageButton feld3,
final ImageButton feld4, final ImageButton feld5,
final ImageButton feld6, final ImageButton feld7,
final ImageButton feld8, final ImageButton feld9) {
feld1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld1.setEnabled(false);
feld1.setAlpha(1);
if(turn==1){
feld1.setBackgroundResource(R.drawable.o);
turn = 0;
felder[0] = 1;
checkWinner();
}
else{
feld1.setBackgroundResource(R.drawable.x);
turn = 1;
felder[0] = 0;
checkWinner();
}
}
});
feld2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld2.setEnabled(false);
if(turn==1){
feld2.setBackgroundResource(R.drawable.o);
turn = 0;
felder[1] = 1;
checkWinner();
}
else{
feld2.setBackgroundResource(R.drawable.x);
felder[1] = 0;
turn = 1;
checkWinner();
}
}
});
feld3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld3.setEnabled(false);
if(turn==1){
feld3.setBackgroundResource(R.drawable.o);
turn = 0;
felder[2] = 1;
checkWinner();
}
else{
feld3.setBackgroundResource(R.drawable.x);
turn = 1;
felder[2] = 0;
checkWinner();
};
}
});
feld4.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld4.setEnabled(false);
if(turn==1){
feld4.setBackgroundResource(R.drawable.o);
turn = 0;
felder[3] = 1;
checkWinner();
}
else{
feld4.setBackgroundResource(R.drawable.x);
felder[3] = 0;
turn = 1;
checkWinner();
}
}
});
feld5.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld5.setEnabled(false);
if(turn==1){
feld5.setBackgroundResource(R.drawable.o);
turn = 0;
felder[4] = 1;
checkWinner();
}
else{
feld5.setBackgroundResource(R.drawable.x);
turn = 1;
felder[4] = 0;
checkWinner();
}
}
});
feld6.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld6.setEnabled(false);
if(turn==1){
feld6.setBackgroundResource(R.drawable.o);
turn = 0;
felder[5] = 1;
checkWinner();
}
else{
feld6.setBackgroundResource(R.drawable.x);
turn = 1;
felder[5] = 0;
checkWinner();
}
}
});
feld7.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld7.setEnabled(false);
if(turn==1){
feld7.setBackgroundResource(R.drawable.o);
turn = 0;
felder[6] = 1;
checkWinner();
}
else{
feld7.setBackgroundResource(R.drawable.x);
turn = 1;
felder[6] = 0;
checkWinner();
}
}
});
feld8.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld8.setEnabled(false);
if(turn==1){
feld8.setBackgroundResource(R.drawable.o);
turn = 0;
felder[7] = 1;
checkWinner();
}
else{
feld8.setBackgroundResource(R.drawable.x);
turn = 1;
felder[7] = 0;
checkWinner();
}
}
});
feld9.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
feld9.setEnabled(false);
if(turn==1){
feld9.setBackgroundResource(R.drawable.o);
turn = 0;
felder[8] = 1;
checkWinner();
}
else{
feld9.setBackgroundResource(R.drawable.x);
turn = 1;
felder[8] = 0;
checkWinner();
}
}
});
}
public int getTurn() {
int whois = turn;
return whois;
}
public void checkWinner(){
ergebnis = (TextView)findViewById(R.id.winners);
if( (felder[0]==1 & felder[1]==1 & felder[2]==1) ||
(felder[3]==1 & felder[4]==1 & felder[5]==1) ||
(felder[6]==1 & felder[7]==1 & felder[8]==1) ||
(felder[0]==1 & felder[4]==1 & felder[8]==1) ||
(felder[6]==1 & felder[4]==1 & felder[2]==1) ||
(felder[0]==1 & felder[3]==1 & felder[6]==1) ||
(felder[1]==1 & felder[4]==1 & felder[7]==1) ||
(felder[2]==1 & felder[5]==1 & felder[8]==1) ){
ergebnis.setText((getIntent().getStringExtra("Name1").toString()) + " " + getString((R.string.gewinnt)));
gotWinner = true;
}else
{ }
if( (felder[0]==1 & felder[1]==1 & felder[2]==1) ||
(felder[3]==0 & felder[4]==0 & felder[5]==0) ||
(felder[6]==0 & felder[7]==0 & felder[8]==0) ||
(felder[0]==0 & felder[4]==0 & felder[8]==0) ||
(felder[6]==0 & felder[4]==0 & felder[2]==0) ||
(felder[0]==0 & felder[3]==0 & felder[6]==0) ||
(felder[1]==0 & felder[4]==0 & felder[7]==0) ||
(felder[2]==0 & felder[5]==0 & felder[8]==0) ){
ergebnis.setText((getIntent().getStringExtra("Name2").toString()) + " " + (getString(R.string.gewinnt)));
gotWinner = true;
}else
{ }
checkIfGotWinner();
}
public void checkIfGotWinner() {
anotherGame = (Button)findViewById(R.id.anotherGame);
if(gotWinner == true){
anotherGame.setVisibility(1);
final Intent anotGame = new Intent(NewGame.this,NewGame.class);
anotGame.putExtra("Name1", spieler1.getText().toString());
anotGame.putExtra("Name2", spieler2.getText().toString());
feld1.setEnabled(false);
feld2.setEnabled(false);
feld3.setEnabled(false);
feld4.setEnabled(false);
feld5.setEnabled(false);
feld6.setEnabled(false);
feld7.setEnabled(false);
feld8.setEnabled(false);
feld9.setEnabled(false);
final TextView spieler1 = (TextView)findViewById(R.id.sp1name);
final TextView spieler2 = (TextView)findViewById(R.id.sp2name);
final ImageView sp1Icon = (ImageView)findViewById(R.id.sp1icon);
final ImageView sp2Icon = (ImageView)findViewById(R.id.sp2icon);
final View trenn = (View)findViewById(R.id.trennlinie);
ergebnis = (TextView)findViewById(R.id.winners);
spieler1.setAlpha(0);
spieler2.setAlpha(0);
sp1Icon.setAlpha(0);
sp2Icon.setAlpha(0);
trenn.setAlpha(0);
ergebnis.setVisibility(1);
anotherGame.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(anotGame);
}
});
};
if(feld1.isEnabled()==false & feld2.isEnabled()==false & feld3.isEnabled()==false & feld4.isEnabled()==false & feld5.isEnabled()==false & feld6.isEnabled()==false &
feld7.isEnabled()==false & feld8.isEnabled()==false & feld9.isEnabled()==false & gotWinner == false){ergebnis.setText(R.string.draw);
anotherGame.setVisibility(1);
final Intent anotGame = new Intent(NewGame.this,NewGame.class);
anotherGame.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(anotGame);
}
});
}
else{}
}
}
日志猫：
11-29 15:59:30.681: E/AndroidRuntime(2683): FATAL EXCEPTION: main
11-29 15:59:30.681: E/AndroidRuntime(2683): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.android.pali/de.android.pali.NewGame}: java.lang.NullPointerException
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.ActivityThread.access$600(ActivityThread.java:123)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.os.Handler.dispatchMessage(Handler.java:99)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.os.Looper.loop(Looper.java:137)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.ActivityThread.main(ActivityThread.java:4424)
11-29 15:59:30.681: E/AndroidRuntime(2683): at java.lang.reflect.Method.invokeNative(Native Method)
11-29 15:59:30.681: E/AndroidRuntime(2683): at java.lang.reflect.Method.invoke(Method.java:511)
11-29 15:59:30.681: E/AndroidRuntime(2683): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-29 15:59:30.681: E/AndroidRuntime(2683): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-29 15:59:30.681: E/AndroidRuntime(2683): at dalvik.system.NativeStart.main(Native Method)
11-29 15:59:30.681: E/AndroidRuntime(2683): Caused by: java.lang.NullPointerException
11-29 15:59:30.681: E/AndroidRuntime(2683): at de.android.pali.NewGame.setupUI(NewGame.java:65)
11-29 15:59:30.681: E/AndroidRuntime(2683): at de.android.pali.NewGame.onCreate(NewGame.java:40)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.Activity.performCreate(Activity.java:4465)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
11-29 15:59:30.681: E/AndroidRuntime(2683): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
11-29 15:59:30.681: E/AndroidRuntime(2683): ... 11 more
希望任何人都可以提供帮助。