Question

我正在尝试将用户在活动类中选择的值移动到服务类，以便服务将运行那么长时间。我知道我必须从微调器中获取所选值，进行数学运算将毫秒转换为分钟，然后将该值传递给服务。它对我来说并不像我这样做，我无法弄清楚为什么。我知道我不能将字符串值作为int值传递，但是当我尝试将值设置为int时，它会产生语法错误以更改回字符串。

活动

    private static final String TAG = "ShipService";
public static final Integer[] TIME_IN_MINUTES = { 30, 45, 60, 180, 360 };
public MediaPlayer mediaPlayer;
public Handler handler = new Handler();
public Button button2;
public Button stop1;
public Spinner spinner2;

// Initialize the activity
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.ship);
    button2 = (Button) findViewById(R.id.btn2);
    button2.setOnClickListener(this);
    stop1 = (Button) findViewById(R.id.stop);
    stop1.setOnClickListener(this);
    spinner2 = (Spinner) findViewById(R.id.spinner2);
    ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,
    android.R.layout.simple_spinner_item, TIME_IN_MINUTES);

   adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner2.setAdapter(adapter);
    int getTime = TIME_IN_MINUTES[spinner2.getSelectedItemPosition()];
    long time = (getTime * 60000);***Gives error here***
    Intent intService =  new Intent(Ship.this, Shipservice.class);***Gives  
            error here***
        intService.hasExtra(time);***Gives error here***



}

// Handle button callback
@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.btn2:
        Log.d(TAG, "onClick: starting service");
        startService(intService);***Gives error here***

        break;
    case R.id.stop:
        Log.d(TAG, "onClick: stopping srvice");
        stopService(intService);***Gives error here***
        break;
    }
}
 }

服务

    public class Shipservice extends Service {
private static final String TAG = "Shipservice";
MediaPlayer myPlayer;

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {
    Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show();
    Log.d(TAG, "onCreate");

    myPlayer = MediaPlayer.create(this, R.raw.ocean_ship);
    myPlayer.setLooping(false); // Set looping
}

@Override
public void onDestroy() {
    Toast.makeText(this, "Ship Service Stopped", Toast.LENGTH_LONG).show();
    Log.d(TAG, "onDestroy");
    myPlayer.stop();
}

@Override
public void onStart(Intent intent, int startid) {
    long time = 0;
    if (intent.hasExtra(time)) {
        time = intent.getLongExtra(time);
    }
    Toast.makeText(this, "Ship Service Started for" + time,  
 Toast.LENGTH_LONG).show();
    Log.d(TAG, "onStart");
    myPlayer.start();
}
}

Answer 1

我认为你的计划存在逻辑缺陷。您正在获取微调器的选定位置并在onCreate中创建Intent，您可能应该在onClick中执行此操作，因此传入的值是用户单击按钮时选择的值。

你也使用“hasExtra”而不是“putExtra”。 hasExtra只会检查是否有额外的内容并返回一个布尔值。当下一个意图开始时，putExtra会添加一个额外的内容。

@Override
public void onClick(View v) {

  int getTime = TIME_IN_MINUTES[spinner2.getSelectedItemPosition()];
  long time = (getTime * 60000);
  Intent intService =  new Intent(Ship.this, Shipservice.class);
  intService.putExtra("timeToRun", time);  //putExtra instead of "hasExtra"

  switch (v.getId()) {
    case R.id.btn2:
        Log.d(TAG, "onClick: starting service");
        startService(intService);

        break;
    case R.id.stop:
        Log.d(TAG, "onClick: stopping srvice");
        stopService(intService);
        break;
    }
}

此外，当你传递额外内容时，你需要指定一个你放入的密钥。我称之为“timeToRun”。你可以通过“intent.getLongExtra（”timeToRun“）得到它;你不能只是在没有键的情况下输入值，因为Intent不知道如何检索它。http://developer.android.com/reference/android/content/Intent.html

将微调器值从活动移动到服务android

1 个答案: