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我正在尝试将一个包从一个 Activity 发送到另一个 Activity 。当我在接收 Activity 中加载包时，所有信息似乎都是空的。这是一些代码:
基础 Activity .java
private final DrawerLayout.DrawerListener mDrawerListener = new DrawerLayout.DrawerListener() {
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
if (mDrawerToggle != null) mDrawerToggle.onDrawerSlide(drawerView, slideOffset);
}
@Override
public void onDrawerOpened(View drawerView) {
if (mDrawerToggle != null) {
mDrawerToggle.onDrawerOpened(drawerView);
}
if (getSupportActionBar() != null) getSupportActionBar().setTitle(R.string.app_name);
}
@Override
public void onDrawerClosed(View drawerView) { // 사이드 바에서 선택한 리스트 동작
if (mDrawerToggle != null) mDrawerToggle.onDrawerClosed(drawerView);
if (mItemToOpenWhenDrawerCloses >= 0) {
Bundle extras = ActivityOptions.makeCustomAnimation(
BaseActivity.this, R.anim.fade_in, R.anim.fade_out).toBundle();
Bundle mediaExtras = new Bundle();
Class activityClass = null;
switch (mItemToOpenWhenDrawerCloses) {
case R.id.navigation_allmusic:
activityClass = MusicPlayerActivity.class;
break;
case R.id.navigation_album:
mediaExtras.putString(SAVED_MEDIA_ID, MEDIA_ID_MUSICS_BY_ALBUM);
Log.d("123qwer", "onDrawerClosed, mediaExtras -> " + SAVED_MEDIA_ID + " " + MEDIA_ID_MUSICS_BY_ALBUM);
activityClass = MusicPlayerActivity.class;
break;
case R.id.navigation_playlists:
//TODO:add class later
// activityClass = PlaceholderActivity.class;
break;
}
if (activityClass != null) {
setBundleInfo(mediaExtras);
startActivity(new Intent(BaseActivity.this, activityClass).putExtras(mediaExtras), extras);
finish();
}
}
}
@Override
public void onDrawerStateChanged(int newState) {
if (mDrawerToggle != null) mDrawerToggle.onDrawerStateChanged(newState);
}
};
MusicPlayerActivity.java
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initializedToolbar();
Log.d("123qwer", "Get Bundle Test " + this.getIntent().getExtras().getString(SAVED_MEDIA_ID));
initializeFromParams(savedInstanceState, getIntent());
}
当我单击某个按钮时，我想将 BaseActivity 类中的 mediaExtras Bundle 发送到另一个 Activity 。你可以在 BaseActivity 中看到这部分内容。
case R.id.navigation_album:
mediaExtras.putString(SAVED_MEDIA_ID, MEDIA_ID_MUSICS_BY_ALBUM);
Log.d("123qwer", "onDrawerClosed, mediaExtras -> " + SAVED_MEDIA_ID + " " + MEDIA_ID_MUSICS_BY_ALBUM);
activityClass = MusicPlayerActivity.class;
break;
我尝试将字符串信息放入 mediaExtras。但是，当我尝试获取它时，我只得到了一个空值。
this.getIntent().getExtras().getString(SAVED_MEDIA_ID)
请教我怎么解决