安卓ApiDemos学习 app/Activity/Redirection

展示Activity间的迁移方法

共有3个画面：RedirectEnter ，RedirectMain ，RedirectGetter

RedirectEnter -----> RedirectMain

Intent intent = new Intent(RedirectEnter.this, RedirectMain.class);
startActivity(intent);

显示发送Intent，指定迁移目的画面

RedirectMain -----> RedirectGetter

Intent intent = new Intent(RedirectMain.this, RedirectGetter.class);
startActivityForResult(intent, NEW_TEXT_REQUEST);

启动时，使用startActivityForResult，以接收RedirectGetter画面的返回值

画面RedirectGetter并用SharedPreferences将值保存，然后返回RESULT_OK

SharedPreferences preferences = getSharedPreferences("RedirectData", 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("text", mText.getText().toString());

if (editor.commit()) {
 setResult(RESULT_OK);
}

画面RedirectMain根据返回code读取SharedPreferences数据

if (resultCode != RESULT_CANCELED) {
    loadPrefs();
}