使用条件在活动之间传递数据

Question

成功尝试在三个活动之间传递数据。 即：

（数据3）活性1（数据1） - >（数据1）活性2（数据2） - >（数据2）Activity3）

现在的问题是：

1. 我想通过使用条件在这些活动之间传递数据。这 在活性2，将数据发送到Activity3之前，我想检查

WORD = "word building" 
DROP = "word built" 

if WORD FROM EDITTEXT == WORD 
     pass data to Activity1 AND 
     goto Activity1 
else 
     if WORD FROM EDITTEXT == DROP 
      pass data to Activity3 AND 
      goto Activity3 

这里是一个名为PickCard.java

public class PickCard extends Activity { 

    String card = "Card Picked"; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     displayIntentData(); 

     findViewById(R.id.sendButton).setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
       Intent intent = new Intent(PickCard.this, BuildWord.class); 
       intent.putExtra("key", card); 
       startActivity(intent); 
      } 
     }); 
    } 

    @Override 
    protected void onNewIntent(Intent intent) { 
     super.onNewIntent(intent); 
     setIntent(intent);//must store the new intent unless getIntent() will return the old one 
     displayIntentData(); 
    } 

    private void displayIntentData() { 
     Intent intent = getIntent(); 
     TextView tv = (TextView) findViewById(R.id.intentData); 
     Bundle extras = intent.getExtras(); 

     if (extras != null) { 
      tv.setText("Data received: " + extras.getString("key")); 
     } else { 
      tv.setText("No extradata received"); 
     } 
    } 
} 

这里活动1代码的代码Activity2 BuildWord.java

public class BuildWord extends Activity { 

    String word = "Word Building"; 
    String finished = "Word Built"; 
    EditText simulate = (EditText) findViewById(R.id.dataToSend); 
    String getdata = simulate.getText().toString(); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.buildword); 

     displayIntentData(); 

     if (getdata == word) { 
      findViewById(R.id.sendButton1).setOnClickListener(new OnClickListener() { 
       public void onClick(View v) { 
        Intent intent = new Intent(BuildWord.this, MainActivity.class); 
        intent.putExtra("key", getdata); 
        startActivity(intent); 

       } 
      }); 
     } else { 
      findViewById(R.id.sendButton1).setOnClickListener(new OnClickListener() { 
       public void onClick(View v) { 
        Intent intent = new Intent(BuildWord.this, DropCard.class); 
        intent.putExtra("key", finished); 
        startActivity(intent); 
       } 
      }); 
     } 
    } 

    @Override 
    protected void onNewIntent(Intent intent) { 
     super.onNewIntent(intent); 
     setIntent(intent); 
     displayIntentData(); 
    } 

    private void displayIntentData() { 
     Intent intent = getIntent(); 
     TextView tv = (TextView) findViewById(R.id.intentData1); 
     Bundle extras = intent.getExtras(); 

     if (extras != null) { 
      tv.setText("Data received: " + extras.getString("key")); 
     } else { 
      tv.setText("No extradata received"); 
     } 
    } 
} 

这里是一个名为DropCard.java

public class DropCard extends Activity { 

    String drop = "Card Dropped"; 
    String declared = "User Declared"; 
    boolean won = false; 
    /*Intent intent = getIntent(); 
    TextView tv = (TextView)findViewById(R.id.intentData2); 
    Bundle extras=intent.getExtras();*/ 
    String get = "word building";//extras.getString("key"); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.dropcard); 

     displayIntentData(); 

     if (get == "word built") { 
      findViewById(R.id.sendButton2).setOnClickListener(new OnClickListener() { 
       public void onClick(View v) { 
        Intent intent = new Intent(DropCard.this, Declare.class); 
        intent.putExtra("key", declared); 
        startActivity(intent); 
       } 
      }); 
     } else { 
      findViewById(R.id.sendButton2).setOnClickListener(new OnClickListener() { 
       public void onClick(View v) { 
        Intent intent = new Intent(DropCard.this, MainActivity.class); 
        intent.putExtra("key", drop); 
        startActivity(intent); 
        //notice we dont call finish() here 
       } 
      }); 
     } 
    } 

    @Override 
    protected void onNewIntent(Intent intent) { 
     super.onNewIntent(intent); 
     setIntent(intent);//must store the new intent unless getIntent() will return the old one 
     displayIntentData(); 
    } 

    private void displayIntentData() { 
     Intent intent = getIntent(); 
     TextView tv = (TextView) findViewById(R.id.intentData2); 
     Bundle extras = intent.getExtras(); 

     if (extras != null) { 
      tv.setText("Data received: " + extras.getString("key")); 
     } else { 
      tv.setText("No extradata received"); 
     } 
    } 
} 

Answer 1

使用

if (getdata.equals(word)){ 

} 

，而不是

if (getdata == word){ 

} 

在当前的代码比较Strings.as为Activity3代码替换所有==与equals

Answer 2

if (getData.getText().toString().equalsIgnoreCase("String name"))//change this line in your code for checking 
    { 
     findViewById(R.id.sendButton1).setOnClickListener(new OnClickListener() 
     { 
      public void onClick(View v) 
      { 
       Intent intent = new Intent(BuildWord.this,MainActivity.class); 
       intent.putExtra("key", getdata); 
       startActivity(intent); 

      } 
     }); 
    } 
    else 
    { 
     findViewById(R.id.sendButton1).setOnClickListener(new OnClickListener() 
     { 
      public void onClick(View v) 
      { 
       Intent intent = new Intent(BuildWord.this,DropCard.class); 
       intent.putExtra("key", finished); 
       startActivity(intent);     
      } 
     }); 
    } 

Answer 3

它是一个简单的你必须compare在那default method equalsIgnoreCase()。

String name = edit_text.getText().toString(); 

    if(name.equalsIgnoreCase("WellCome")) 
    { 

     //CALL YOUR ACTIVITY ONE 

    } 
    else 
    { 

     //CALL YOUR ACTIVITY THREE 

    }