Intent传值

public void sendMessage(View view) {
    // Do something in response to button
    Intent intent = new Intent(this, DisplayMessageActivity.class);
    EditText editText = (EditText) findViewById(R.id.edit_message);
    String message = editText.getText().toString();
    intent.putExtra(EXTRA_MESSAGE, message);
    startActivity(intent);
}

Intent intent = getIntent();
String message = intent.getStringExtra(MyActivity.EXTRA_MESSAGE);
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
RelativeLayout layout = (RelativeLayout) findViewById(R.id.content);
layout.addView(textView);

  tools:context="com.dream.myfirstapp.DisplayMessageActivity"
    android:id="@+id/content">
</RelativeLayout>