Soonmyun Jang Soonmyun Jang - 1 month ago 16
Java Question

Android How to send a Bundle to another Activity?

I am trying to send a bundle from one activity to another. When I load the bundle in the recieving activity all the information seems to be null. Here is some code:

BaseActivity.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());
}


I want to send the mediaExtras Bundle in BaseActivity class to another activity when I click some button. You can see this part in BaseActivity.

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;


I tried to put String information to mediaExtras. But, when I tried to get this, I just got a null value.

this.getIntent().getExtras().getString(SAVED_MEDIA_ID)


Please teach me how to solve it

Answer

You have a few below options:

1) Use the Bundle from the Intent:

Intent mIntent = new Intent(this, Example.class);
Bundle extras = mIntent.getExtras();
extras.putString(key, value);  

2) Create a new Bundle

Intent mIntent = new Intent(this, Example.class);
Bundle mBundle = new Bundle();
mBundle.putString(key, value);
mIntent.putExtras(mBundle);

3) Use the putExtra() shortcut method of the Intent

Intent mIntent = new Intent(this, Example.class);
mIntent.putExtra(key, value);

Then, in the launched Activity, you would read them via:

String value = getIntent().getExtras().getString(key)

NOTE: Bundles have "get" and "put" methods for all the primitive types, Parcelables, and Serializables. I just used Strings for demonstration purposes.

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