Java/Android：傳遞Intent Extras，然後在另一種方法上使用它

大家好，再次大家好，
這次我有一個意向& Extras的問題。Java/Android：傳遞Intent Extras，然後在另一種方法上使用它

這是我的第一個活動

Intent i1 = new Intent(RoomSetting.this, App.class); 
i1.putExtra("subposition1", "right"); 
final int result=1; 
startActivityForResult(i1, result);

，並在第二個活動我試圖讓「subposition1」值

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    mAccVals = new Number3d(); 
    Bundle extras = getIntent().getExtras(); 
    String SubPos = extras.getString("subposition1"); 
}

我的問題是，我怎麼能在另一種方法使用SUBPOS？

對於noobish問題抱歉。在此先感謝

來源

2012-06-20 Duriothenoob

它一直給空值 – Duriothenoob

把它作爲參數傳遞給方法，或它的一個實例變量 – Rajesh

只需撥打這個在您的「其他方法」。

String subposition = getIntent().getStringExtra("subposition1");

來源

2012-06-20 14:14:49 razielsarafan

啊，它的工作原理，以及非常簡單。非常感謝大家 – Duriothenoob

String SubPos; 
// declare SubPos String as class variable and you can access anywhere in class<<< 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    mAccVals = new Number3d(); 
    Bundle extras = getIntent().getExtras(); 
    SubPos = extras.getString("subposition1"); 
} 

public void anotherMethod(){ 
//here you can access it... 
}

來源

2012-06-20 13:50:50

聲明SUBPOSonCreate像以前一樣：

public String SubPos=null; // or you can also declare it as static as your need 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    mAccVals = new Number3d(); 
    Bundle extras = getIntent().getExtras(); 
    SubPos = extras.getString("subposition1"); 
} 


    public void testmethod() 
    { 
     String str=SubPos; //get SubPos value 
    }

來源

2012-06-20 13:51:06

有2種方式easyly這樣做的：

第一種方式：使用全局變量的類：

String SubPos; 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    mAccVals = new Number3d(); 
    Bundle extras = getIntent().getExtras(); 
    SubPos = extras.getString("subposition1"); //note that I've deleted the 'String' 
}

2n方式：傳遞給方法th Ë變量：

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    mAccVals = new Number3d(); 
    Bundle extras = getIntent().getExtras(); 
    String SubPos = extras.getString("subposition1"); 
    otherMethod(SubPos); 
} 

public void otherMethod(String s) { 
    //do stuff. 
}

我認爲，也許你想在另一類這個變量，那麼你就可以做到這一點添加此功能（具有類字符串SUBPOS全球）：

String SubPos; 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    mAccVals = new Number3d(); 
    Bundle extras = getIntent().getExtras(); 
    SubPos = extras.getString("subposition1"); //note that I've deleted the 'String' 
    } 
    public String getSubPos() { 
     return SubPos; 
    }

這您可以在任何其他具有該實例的類中調用instanceOfTheClass.getSubPos（）方法。

來源

2012-06-20 13:56:26

更換

Bundle extras = getIntent().getExtras(); 
String SubPos = extras.getString("subposition1");

與

String SubPos = getIntent().getStringExtra("subposition1");

來源

2012-06-20 13:56:36

Java/Android：傳遞Intent Extras，然後在另一種方法上使用它

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