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[英]Implementing parcelable in a class to pass it from an activity to another
[英]How to pass non parcelable objects to from activity to another activity?
我有兩個對象從兩個不同的類實例化,這兩個類不實現parcelable或serializable。 我想將這些對象傳遞給另一個活動,所以我寫了下面的代碼:
*代碼 :
//send object
Intent intConnect = new Intent(mCtx.getApplicationContext(), ActConnect.class);
Bundle bndConnect = new Bundle();
bndConnect.putParcelable("HeaderModel", (Parcelable) mHeaderModel);
bndConnect.putParcelable("DetailsModel", (Parcelable) mDetailsModel);
intConnect.putExtras(bndConnect);
intConnect.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mCtx.startActivity(intConnect);
//receive objects in the receiving activity
Bundle extras = getIntent().getExtras();
Header headerModel = (Header) extras.get("HeaderModel");
Details detailsModel = (Details) extras.get("DetailsModel");
但在運行時,我收到以下logcat:
logcat :
10-08 11:55:44.225 13138-13138/com.example.com.bt_11 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.com.bt_11, PID: 13138
java.lang.ClassCastException: com.example.com.adapter.Header cannot be cast to android.os.Parcelable
at com.example.com.adapter.MyExpandableList$1.onClick(MyExpandableList.java:152)
at android.view.View.performClick(View.java:5184)
at android.view.View$PerformClick.run(View.java:20893)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
如何將非parcelable對象從活動傳遞到另一個活動?
如果您的類沒有實現parcelable或serializable,並且您無法修改它們(代碼可能不在您的控制之下),那么您無法直接在兩個活動之間發送數據。
但是,您可以在兩個活動之間間接傳遞數據。 您可以將它們存儲在單個類中(但是單例很難測試等),您可以將它們保存並從應用程序類中檢索它們,或者您可以將它們保存到共享引用,文件或數據庫以由第二個活動加載。
試試這樣:
Bundle bundle=getIntent().getExtras();
Header headerModel =(Header)) bundle.getParcelable("HeaderModel");
傳遞沒有parcelable或serializable的對象的最好方法是使用Gson Lib
並使用此擴展:
fun Intent.putObject(name: String, value: Any) {
val jsonValue = Gson().toJson(value)
this.putExtra(name, jsonValue)
}
inline fun <reified T : Any> Intent.getObjectExtra(name: String): T? {
val json = this.getStringExtra(name)
val obj = Gson().fromJson<T>(json, T::class.java)
return (obj as T)
}
inline fun <reified T : Any> Bundle.getObject(name: String): T? {
val json = this.getString(name)
val obj = Gson().fromJson<T>(json, T::class.java)
return (obj as T)
}
使用:
val intent = Intent(this,YourActivity::class.java)
intent.putObject(name = "myKey", value = MyObject)
//To get the object in the other activity
val product = intent.extras?.getObject<MyObject>(name = "myKey")
// or
val product = intent.getObjectExtra<MyObject>(name = "myKey")
你可以這樣做:
您的Model類如下所示:
public class ModelClass implements Serializable{
// Other stuff
}
如何通過:
Intent mIntent = new Intent(mContext, NextActivity.class);
mIntent.putExtra("HeaderModel", mHeaderModel);
startActivity(mIntent);
如何獲得:
Header headerModel = (Header) getIntent.getSerializableExtra("HeaderModel");
希望這會幫助你。
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