【putExtra("A",B)中,AB爲鍵值對,第一個參數爲鍵名,第二個參數爲鍵對應的值。順便提一下,如果想取出Intent對象中的這些值,需要在你的另一個Activity中用getXXXXXExtra方法,注意需要使用對應類型的方法,參數爲鍵名】
要不我舉個例子吧,,大家注意註釋的地方哈,源碼在下面。
來建第一個Activity:MyIntent
public class MyIntent extends Activity
{ /*聲明控件對象*/ private
EditText et1, et2; private
Button bt; /**
Called when the activity is first created. */ @Override public
void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); /*取得控件對象*/ et1
= (EditText) findViewById(R.id.et1); et2
= (EditText) findViewById(R.id.et2); bt
= (Button) findViewById(R.id.bt); /*爲按鈕綁定監聽器*/ bt.setOnClickListener(new
OnClickListener() { @Override public
void onClick(View v) { /*取得輸入框中的內容*/ String et1Str = et1.getText().toString(); String et2Str = et2.getText().toString(); //創建Intent對象,參數分別爲上下文,要跳轉的Activity類 Intent intent = new Intent(MyIntent. this ,
SecondActivity. class ); //將要傳遞的值附加到Intent對象 intent.putExtra( "et1" , et1Str); intent.putExtra( "et2" , et2Str); //啓動該Intent對象,實現跳轉 startActivity(intent); } }); } } |
再建第二個Activity:SecondActivity
public class SecondActivity extends Activity{ //聲明TextView對象 private TextView tv; @Override protected void onCreate(Bundle savedInstanceState)
{ super .onCreate(savedInstanceState); setContentView(R.layout.second); //取得TextView對象 tv = (TextView) findViewById(R.id.tv); //取得啓動該Activity的Intent對象 Intent intent =getIntent(); /*取出Intent中附加的數據*/ String first = intent.getStringExtra( "et1" ); String second = intent.getStringExtra( "et2" ); //計算得到結果 int result = Integer.parseInt(first) + Integer.parseInt(second); //設置TextView顯示的文本 tv.setText( "計算結果爲:" +String.valueOf(result)); } } |