Android如何将Bundle发送到另一个Activity？

Question

我正在尝试从一个活动发送一个 bundle 到另一个活动。当我在接收活动中加载 bundle 时，所有信息似乎都是 null。以下是一些代码：

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());
    }

我希望当我点击某个按钮时，能够将BaseActivity类中的mediaExtras Bundle发送到另一个活动中。您可以在BaseActivity中看到这一部分。

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;

我试图将字符串信息放入mediaExtras中。但是，当我尝试获取它时，我只得到了null值。

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

请教我如何解决它。

- Soonmyun Jang

---

这行代码会在logcat中打印出来吗？Log.d("123qwer", "onDrawerClosed, mediaExtras -> " + SAVED_MEDIA_ID + " " + MEDIA_ID_MUSICS_BY_ALBUM); - Ishita Sinha

...putExtras(mediaExtras), extras) 的意思是什么？mediaExtras 和 extras 都是 Bundle 对象。在 putExtras 中使用键作为第一个参数将 Bundle 添加到 Intent 中，然后在下一个 Activity 中使用相同的键来访问 Bundle。 - ρяσѕρєя K

http://meta.stackexchange.com/questions/473/can-i-re-ask-a-question-if-it-hasnt-been-answered - Arjan

Answer 1

首先创建数据包并将其附加到意图中

Intent mainIntent = new Intent(getApplicationContext(),XXXX.class);
Bundle dataBundle = new Bundle();
dataBundle.putString("keyid","thevalue");
mainIntent.putExtras(dataBundle);
startActivity(mainIntent);

要在XXXX活动中获取此捆绑包

//getting the datbundel from other activity incoming
Bundle extras = getIntent().getExtras();
String a=extras.getString("keyid");

- VYSHAK M