Question

我是java编程的新手，我正在尝试将信息传递给另一个类并将其显示为TextView。我有两个类：Match和MatchResult。在匹配中你可以按一个按钮，一个int将+1。我在网站上也有一个按钮，可以让你去下一堂课。在下一课我想要让分数显示在TextView中。但有些东西不起作用，我不明白为什么。这是我的代码希望有人可以帮助我：

Match.java：

    public class Match extends Activity implements OnClickListener{

public final static String EXTRA_MESSAGE = "com.epstudios.basketballmanager_v1.MATCHRESULT";
TextView awayGoals, homeGoals, home, away;
Button homebtn, awaybtn, gotoresult;
int homecount, awaycount;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.match);

    baconAndEggs();

    homebtn.setOnClickListener(this);
    awaybtn.setOnClickListener(this);
    gotoresult.setOnClickListener(this);
}

public void sendInfo(View view) {
    Intent intent = new Intent(this, Match.class);
    intent.putExtra(EXTRA_MESSAGE, awaycount);
    Intent homeintent = new Intent(this, Match.class);
    homeintent.putExtra(EXTRA_MESSAGE, homecount);
}



private void baconAndEggs() {
    awayGoals = (TextView) findViewById(R.id.Away);
    homeGoals = (TextView) findViewById(R.id.Home);
    homebtn = (Button) findViewById(R.id.homeBtn);
    awaybtn = (Button) findViewById(R.id.awayBtn);
    gotoresult = (Button) findViewById(R.id.matchResult);

}

public void counter() {
    awaycount = 1;
    homecount = 0;
}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
    case R.id.homeBtn:
        homecount ++;
        homeGoals.setText("Lakers: " + homecount);
        break;
    case R.id.awayBtn:
        awaycount ++;
        awayGoals.setText("Heat: " + awaycount);
        break;
    case R.id.matchResult:
        Intent result = new Intent(this, MatchResult.class);
        startActivity(result);
        break;
    }
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    finish();
}
}

MatchResult.java：

    public class MatchResult extends Activity {

TextView home, away;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.match_result);

    resultcounter();

    Intent awayintent = getIntent();
    String awayresult = awayintent.getStringExtra(Match.EXTRA_MESSAGE);
    Intent homeintent = getIntent();
    String homeresult = homeintent.getStringExtra(Match.EXTRA_MESSAGE);

    home.setText(homeresult);
    Log.d("Petter", homeresult);
}

日志不起作用

Answer 1

你添加为'Integer'putExtra（“KEY”，int）并检索为'String'（getStringExtra）

使用以下命令更改sendInfo：

 public void sendInfo(View view) {
   Intent intent = new Intent(this, MatchResult.class);
   intent.putExtra(EXTRA_MESSAGE_AWAY, awaycount);
   intent.putExtra(EXTRA_MESSAGE_HOME, homecount);
   startActivituy(intent);
}

将MatchResult更改为：

 public class MatchResult extends Activity {

TextView home, away;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
   setContentView(R.layout.match_result);

   resultcounter();

int awayresult = getIntent().getIntExtra(Match.EXTRA_MESSAGE_AWAY, -1);
int homeresult = getIntent().getIntExtra(Match.EXTRA_MESSAGE_HOME, -1);

home.setText(String.valueOf(homeresult));
Log.d("Petter", String.valueOf(homeresult));
}

Answer 2

您正在使用此功能开始第二个活动：

case R.id.matchResult:
        Intent result = new Intent(this, MatchResult.class);
        result.putExtra(EXTRA_MESSAGE_HOME, awaycount);//Use this
        result.putExtra(EXTRA_MESSAGE_AWAY, homecount);//Use this
        startActivity(result);
        break;

在这里放置一个意图。不要使用2个意图。只需将两个变量放在同一意图中使用2个键即可。

在第二项活动中这样做：

Intent intent = getIntent（）; String awayresult = String.valueOf（intent.getIntExtra（Match.EXTRA_MESSAGE_AWAY，-1））; String homeresult = String.valueOf（intent.getIntExtra（Match.EXTRA_MESSAGE_HOME，-1））;

Answer 3

匹配度：

    public class Match extends Activity implements OnClickListener {

public final static String EXTRA_MESSAGE_HOME = "com.epstudios.basketballmanager_v1.MATCHRESULT";
public final static String EXTRA_MESSAGE_AWAY = "com.epstudios.basketballmanager_v1.MATCHRESULT";
TextView awayGoals, homeGoals, home, away;
Button homebtn, awaybtn, gotoresult;
int homecount, awaycount;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.match);

    baconAndEggs();

    homebtn.setOnClickListener(this);
    awaybtn.setOnClickListener(this);
    gotoresult.setOnClickListener(this);


}

 public void sendInfo(View view) {
     Intent intent = new Intent(this, MatchResult.class);
       intent.putExtra(EXTRA_MESSAGE_AWAY, awaycount);
       intent.putExtra(EXTRA_MESSAGE_HOME, homecount);
       startActivity(intent);
    }

private void baconAndEggs() {
    awayGoals = (TextView) findViewById(R.id.Away);
    homeGoals = (TextView) findViewById(R.id.Home);
    homebtn = (Button) findViewById(R.id.homeBtn);
    awaybtn = (Button) findViewById(R.id.awayBtn);
    gotoresult = (Button) findViewById(R.id.matchResult);

}

public void counter() {
    awaycount = 1;
    homecount = 0;
}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
    case R.id.homeBtn:
        homecount++;
        homeGoals.setText("Lakers: " + homecount);
        break;
    case R.id.awayBtn:
        awaycount++;
        awayGoals.setText("Heat: " + awaycount);
        break;
    case R.id.matchResult:
        Intent result = new Intent(this, MatchResult.class);
        startActivity(result);
        break;
    }
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    finish();
}
}

MatchResult的：

public class MatchResult extends Activity {

TextView home, away;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.match_result);

    resultcounter();

    int awayresult = getIntent().getIntExtra(Match.EXTRA_MESSAGE_AWAY, -1);
    int homeresult = getIntent().getIntExtra(Match.EXTRA_MESSAGE_HOME, -1);

    home.setText(String.valueOf(homeresult));
    Log.d("Petter", String.valueOf(homeresult));
    away.setText(String.valueOf(awayresult));
}

public void resultcounter() {
    // TODO Auto-generated method stub

    home = (TextView) findViewById(R.id.homeresult);
    away = (TextView) findViewById(R.id.awayresult);
}
}

Java getIntent问题

3 个答案: