android - 通过 Intent 传递数据

Question

为什么这行不通？只是试图将一个可编辑的字符串从一个 Activity 传递到另一个 Activity 。但我无法让它工作。通过 Intent 传递的字符串是否必须预先定义？如果是这样，我如何传递可编辑的字符串？

   @Override
  public void onClick(View v) 
     {
             // TODO Auto-generated method stub
         textOut.setText(textIn.getText());

            Intent intent = new  Intent(TutorialOne.this,MainActivity.class);
        intent.putExtra("text", textIn.getText());
        startActivity(intent);
     }


public class MainActivity extends Activity 
  {

TextView gettext;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    gettext = (TextView) findViewById(R.id.textView1);
    Intent intent = getIntent();
    intent.getExtras().getString("text");
    String s = intent.getStringExtra("text");
    gettext.setText(s);
    gettext.setTextColor(Color.WHITE);

}

Answer 1

用这个代替这个。

 @Override
  public void onClick(View v) 
     {
             // TODO Auto-generated method stub
        textOut.setText(String.valueOf(textIn.getText()));
        Intent intent = new  Intent(TutorialOne.this,MainActivity.class);
        intent.putExtra("text", String.valueOf(textIn.getText()));
        startActivity(intent);
     }

而不是这个。

 @Override
  public void onClick(View v) 
     {
             // TODO Auto-generated method stub
         textOut.setText(textIn.getText());

            Intent intent = new  Intent(TutorialOne.this,MainActivity.class);
        intent.putExtra("text", textIn.getText());
        startActivity(intent);
     }