[英]Passing data from one activity to another when choosing a menu option from action bar in Android app
我不知道是否有人可以提供一些指导。
我有一个主类,用户将在其中输入他们的姓名。 然后,我希望用户从操作/应用程序栏中的可用选项中选择游戏。 当他们选择游戏时,他们在主类中输入的名称将显示在游戏类中。 我希望这是有道理的?
我知道这涉及使用意图将数据从一个活动传递到另一个活动,但是我看到的每个教程都涉及在主类中设置一个按钮(因此使用诸如onclicklistener之类的东西),但是我不希望有一个按钮。 我想选择菜单选项来完成相同的工作,但是我找不到任何方法。
提前致谢。
编辑-尝试添加代码
主班:
public class GameCentral extends AppCompatActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.game_central_layout);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.commonmenus, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.guessingGame) {
startActivity(new Intent(this, Task3Activity.class));
switch (item.getItemId()) {
case R.id.playerNameEntered:
startActivity(this, Task3Activity.class).putExtra(playerNameInput, value);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
else if (id ==R.id.placeOne) {
Toast.makeText(this, "Game Placeholder One option is Clicked", Toast.LENGTH_SHORT).show();
}
else if (id ==R.id.placeTwo) {
Toast.makeText(this, "Game Placeholder Two option is Clicked", Toast.LENGTH_SHORT).show();
}
else if (id ==R.id.placeThree) {
Toast.makeText(this, "Game Placeholder Three option is Clicked", Toast.LENGTH_SHORT).show();
}
return super.onOptionsItemSelected(item);
}
}
游戏类
public class Task3Activity extends GameCentral {
public Button rtnBtn;
// button to return to Game Central at any point when clicked
public void init() {
rtnBtn = (Button)findViewById(R.id.returnBtn);
rtnBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent homeScreen = new Intent(Task3Activity.this, GameCentral.class);
startActivity(homeScreen);
}
});
}
String value;
int attempts = 0;
final int maxAttempts = 1;
Random randGen = new Random();
int ranNum;
private SoundPlayer sound;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.task3_layout);
init();
Bundle extras = getIntent().getExtras();
if (extras != null) {
value = extras.getString("Value1");
if (value != null) {
TextView dataRcvd = (TextView) findViewById(R.id.playerNameEntered);
dataRcvd.setText(value );
}
}
sound = new SoundPlayer(this);
final TextView textResponse = (TextView) findViewById(R.id.txtResponse);
final TextView guessText = (TextView) findViewById(R.id.txtAnswer);
final EditText userGuess = (EditText) findViewById(R.id.etNumber);
Button pressMe = (Button) findViewById(R.id.btnGuess);
final Button rtnButton = (Button) findViewById(R.id.returnBtn);
int min = 1;
int max = 19;
randGen = new Random();
// Generate number once
ranNum = randGen.nextInt(max - min + 1) + min;
final Toast toast = Toast.makeText(getApplicationContext(), "Please guess between 0 and 20", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 350);
// When the button is clicked, it shows the text assigned to the txtResponse TextView box
pressMe.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean correct = false;
final AlertDialog.Builder alert = new AlertDialog.Builder(Task3Activity.this);
alert.setTitle("Unlucky");
alert.setCancelable(false);
alert.setMessage("You have guessed incorrectly three times. " +
"The answer was " + ranNum + ". " + "Would you like to play again?")
//.setCancelable(true)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//dialog.dismiss();
Intent i = new Intent(Task3Activity.this, Task3Activity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
});
alert
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int i) {
//Task1Activity.this.finish();
dialog.dismiss();
//finishAffinity();
Intent toy = new Intent(Task3Activity.this, GameCentral.class);
startActivity(toy);
}
;
});
final AlertDialog.Builder alert2 = new AlertDialog.Builder(Task3Activity.this);
alert2.setTitle("You Did It!");
alert2.setCancelable(false);
alert2.setMessage("The answer was " + ranNum + ". " + "Would you like to play again?")
//.setCancelable(true)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//dialog.dismiss();
Intent i = new Intent(Task3Activity.this, Task3Activity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
});
alert2
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int i) {
//Task1Activity.this.finish();
dialog.dismiss();
Intent toy = new Intent(Task3Activity.this, GameCentral.class);
startActivity(toy);
//finishAffinity();
}
;
});
int userNumber = Integer.parseInt(userGuess.getText().toString());
if ((userNumber < 1) || (userNumber > 19)) {
//guessText.setText("Please guess between 0 and 20");
//guessText.setBackgroundColor(Color.WHITE);
toast.show();
} else if (userNumber < ranNum) {
guessText.setText("Your answer is too low. Guess again!");
guessText.setBackgroundColor(Color.YELLOW);
//sound.playBuzzerSound();
} else if (userNumber > ranNum) {
guessText.setText("Your answer is too high. Guess again!");
guessText.setBackgroundColor(Color.RED);
//sound.playBuzzerSound();
} else if (userNumber == ranNum) {
ranNum = randGen.nextInt(20);
//guessText.setText("You did it!");
//guessText.setBackgroundColor(Color.WHITE);
correct = true;
alert2.show();
sound.playApplauseSound();
}
if (attempts++ > maxAttempts && !correct) {
alert.show();
sound.playBooSound();
//guessText.setText("You have guessed incorrectly three times. The answer was " + ranNum);
} else if (correct) {
} else {
String randText = "";
randText = Integer.toString(ranNum);
textResponse.setText("");
userGuess.setText("");
}
}
}
);
}
}
因为您没有在意图中传递Bundle,所以不需要使用getIntent().getExtras();
。
游戏中心:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.guessingGame:
Intent intent = new Intent(GameCentral.this, Task3Activity.class);
intent.putExtra("PlayerName", "Name");
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
Task3Activity:
public class Task3Activity extends AppCompatActivity {
...
@Override
public void onCreate(Bundle savedInstanceSate) {
...
String playerName = getIntent().getStringExtra("PlayerName");
if (playerName != null) {
TextView dataRcvd = (TextView) findViewById(R.id.playerNameEntered);
dataRcvd.setText(playerName);
}
}
...
}
intent.putExtra("PlayerName", "Name");
其中“名称”是从中获取播放器名称的字符串。 如果要从文本框中获取播放器的名称,则需要在“活动”范围内创建EditText对象。
if (id == R.id.guessingGame) {
startActivity(new Intent(this, Task3Activity.class));
switch (item.getItemId()) {
case R.id.playerNameEntered:
Bundle b = getIntent().getExtras();
value= b.getString("playerNameInput");
startActivity(this, Task3Activity.class).putExtra("playerNameInput", value);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
就我而言,我经常使用bundle在onOptionsItemSelected函数中获取字符串。
要激活此功能,应在每次更改活动时发送data(playerNameInput)。
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