利用intent呼叫Activity及傳送資料

利用intent呼叫Activity及傳送資料

 

Activity1程式碼

public class Activity1 extends Activity

{

     private Button bt1;

     @Override

     protected void onCreate(Bundle savedInstanceState)

     {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_activity1);

       

        

         bt1 = (Button) findViewById(R.id.button1);

         bt1.setOnClickListener(new Button.OnClickListener()

         {

              @Override

              public void onClick(View v)

              {

                  // TODO Auto-generated method stub

                  Intent it = new Intent();

                  it.setClass(Activity1.this, Activity2.class);

                  it.putExtra("pass", "ispassword");

                  it.putExtra("user", "ZCFang");

                  startActivity(it);

              }

         });

     }

}

說明:

1.使用intent.setClass設定欲開啟的Activity

2.使用intent.putExtra 放入欲傳送的資訊,若資料量很大也可以選擇使用Bundle物件加入資訊,再藉由intent傳送

3.使用startActivity傳送intent並開啟指定的Activity

Activity2程式碼

public class Activity2 extends Activity

{

     private Button bt2;

     @Override

     protected void onCreate(Bundle savedInstanceState)

     {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_activity2);

        

         Bundle b = getIntent().getExtras();

         String str = b.getString("user") + " : " + b.getString("pass");

         Toast.makeText(this, str, Toast.LENGTH_LONG).show();

         bt2 = (Button) findViewById(R.id.button2);

         bt2.setOnClickListener(new Button.OnClickListener()

         {

              @Override

              public void onClick(View v)

              {

                  // TODO Auto-generated method stub

                  Intent it = new Intent();

                  it.setClass(Activity2.this, Activity1.class);

                  startActivity(it);

              }

         });

     }

}

說明:

1.使用Bundle接收使用者傳送過來的資訊

2.再依資料型別從Bundle物件中取出資料