原因:java.lang.NullPointerException:尝试对空对象引用调用接口方法
我无法将高分提交到android排行榜。现在排行榜是空的,没有提交任何内容。我有一个int“oldScore”需要提交。现在我正在尝试一段代码来提交它,但是调用该活动时会崩溃。我的代码:原因:java.lang.NullPointerException:尝试对空对象引用调用接口方法,java,android,android-studio,nullpointerexception,Java,Android,Android Studio,Nullpointerexception,我无法将高分提交到android排行榜。现在排行榜是空的,没有提交任何内容。我有一个int“oldScore”需要提交。现在我正在尝试一段代码来提交它,但是调用该活动时会崩溃。我的代码: public class GameOver extends BaseGameActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener { private Goo
public class GameOver extends BaseGameActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private GoogleApiClient mGoogleApiClient;
public static int score;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_over);
mGoogleApiClient.connect();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Drive.API)
.addScope(Drive.SCOPE_FILE)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
int newScore = GameOver.score;
SharedPreferences prefs = this.getSharedPreferences("myPrefsKey", Context.MODE_PRIVATE);
int oldScore = prefs.getInt("key", 0);
if (newScore > oldScore) {
SharedPreferences.Editor edit = prefs.edit();
edit.putInt("key", newScore);
edit.commit();
EditText HighScore = (EditText) findViewById(R.id.HighScoreT);
HighScore.setText("" + newScore);
} else {
EditText HighScore = (EditText) findViewById(R.id.HighScoreT);
HighScore.setText("" + oldScore);
Games.Leaderboards.submitScoreImmediate(getApiClient(),String.valueOf(R.string.number_guesses_leaderboard), oldScore);
}
}
日志:
原因:java.lang.NullPointerException:尝试调用接口
方法无效
空值上的com.google.android.gms.common.api.GoogleAppClient.connect()
对象引用
声明
mGoogleApiClient.connect();
应在您调用该方法的
mGoogleApiClient
实例化后出现
connect()
论客体
mGoogleApiClient
没有实例化它
你需要先写这个
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Drive.API)
.addScope(Drive.SCOPE_FILE)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
那么这个,
mGoogleApiClient.connect();
在初始化
mGoogleApiClient
引用之前,无法调用connect()
。像
// mGoogleApiClient.connect();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Drive.API)
.addScope(Drive.SCOPE_FILE)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mGoogleApiClient.connect(); // <-- move to here.
//mGoogleApiClient.connect();
mgoogleapclient=新的Googleapclient.Builder(此)
.addApi(Drive.API)
.addScope(驱动器.SCOPE\u文件)
.addConnectionCallbacks(此)
.addOnConnectionFailedListener(此)
.build();
mGoogleApiClient.connect();// 尝试以下过程:
在加载contentview之前分配google客户端:
private GoogleApiClient mGoogleApiClient;
public static int score;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Drive.API)
.addScope(Drive.SCOPE_FILE)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
setContentView(R.layout.activity_game_over);
}
在启动时添加覆盖并连接google客户端
@Override
public void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
public void onStop() {
super.onStop();
mGoogleApiClient.disconnect();
}
执行此操作时,会出现以下错误:“java.lang.RuntimeException:无法启动活动组件信息:java.lang.IllegalStateException:GoogleAppClient尚未连接。”执行此操作时,会出现以下错误:“java.lang.RuntimeException:无法启动活动组件信息:java.lang.IllegalStateException:GoogleAppClient尚未连接。”如果您正在使用google登录,您应该从onStart()调用该方法。我刚刚创建了onStart()和onStop()方法,并将mgoogleAppClient.connect()放入;在OnStart中,我得到了相同的错误。当我删除“Games.Leadboards.SubmitCoreImmediate(getApiClient(),String.valueOf(R.String.number\u guesses\u Leadboard),oldScore”时;“我的活动工作正常..这就是我的错误来源。我应该如何更改它以提交分数?当我这样做时,我会收到以下错误:“java.lang.RuntimeException:无法启动活动组件信息:java.lang.IllegalStateException:GoogleAppClient尚未连接。”。“好的。听起来我们已经修复了您的NullPointerException
。你对你的工作做过任何研究吗?