如何将包含Bitmap的对象传递给另一个活动
所以我是Android开发中的新手，我试图制作一个加载图片（Bitmap）的注册活动（ UserPrivateInfoSignUpActivity.java ）并创建一个我想要传递给另一个Activity（ UserGeneralDataSignUpActivity ）的UserPersona对象。
我做了一个解决方案的研究，不知怎的，我仍然无法传递Bitmap图像，虽然它已经implements Parcelable 。
有什么建议么？ 这是我的代码（没有getter和setter）
PersonaUser.java：
public class PersonaUser implements Parcelable{ private String puName; private String puEmailAddress; private String puCountry; private String puCity; private int puAge; private Bitmap puImage; public PersonaUser(String puName, String puEmailAddress, String puCountry, String puCity, int puAge, Bitmap puImage){ this.puName = puName; this.puEmailAddress = puEmailAddress; this.puCountry = puCountry; this.puCity = puCity; this.puAge = puAge; this.puImage = puImage; } //Constructor using parcel public PersonaUser(Parcel in) { this.puName = in.readString(); this.puEmailAddress = in.readString(); this.puCountry = in.readString(); this.puCity = in.readString(); this.puAge = in.readInt(); this.puImage = (Bitmap) in.readValue(Bitmap.class.getClassLoader()); } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel parcel, int i) { parcel.writeString(puName); parcel.writeString(puEmailAddress); parcel.writeString(puCountry); parcel.writeString(puCity); parcel.writeInt(puAge); parcel.writeValue(puImage); } public static final Parcelable.Creator CREATOR = new Parcelable.Creator() { @Override public PersonaUser createFromParcel(Parcel in) { return new PersonaUser(in); //using parcelable constructor } @Override public PersonaUser[] newArray(int i) { return new PersonaUser[i]; } }; }
UserPrivateInfoSignUpActivity.java：
public class UserPrivateInfoSignUpActivity extends AppCompatActivity { private static int IMAGES_FROM_GALLERY = 1; Button nextActivityButton, pickImageButton; Bitmap puImageBitmap; PersonaUser npUser; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_user_private_info_sign_up); nextActivityButton = findViewById(R.id.next_activity); pickImageButton = findViewById(R.id.pick_image); addImage(); nextActivity(); } //Get image from gallery @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); puImageBitmap = null; //Detects request codes if (requestCode == IMAGES_FROM_GALLERY && resultCode == Activity.RESULT_OK) { Uri selectedImage = data.getData(); try { puImageBitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImage); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } ImageView imageView = (ImageView) findViewById(R.id.imgView); imageView.setImageBitmap(puImageBitmap); } // next Activity public void nextActivity(){ nextActivityButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent i = new Intent(UserPrivateInfoSignUpActivity.this, UserGeneralDataSignUpActivity.class); npUser = new PersonaUser("example", "example","example","example",21,puImageBitmap); i.putExtra("user" , npUser); startActivity(i); } }); } //add Image method public void addImage(){ pickImageButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI); startActivityForResult(i, IMAGES_FROM_GALLERY); } }); } }
UserGeneralDataSignUpActivity.java （我想要检索用户对象）
public class UserGeneralDataSignUpActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_user_general_data_sign_up); Intent i = getIntent(); ImageView iv = findViewById(R.id.show); //where I want to display image PersonaUser pu = i.getParcelableExtra("user"); iv.setImageBitmap(pu.getPuImage()); //PersonaUser method (returns Bitmap) }
它成功移动到下一个Activty，虽然每次我加载图片，然后尝试移动到下一个活动我的应用程序崩溃。
在这里我添加了LogCat（添加图像后）
04-15 10:40:09.720 20654-20654/com.rarely1gmail.personas E/JavaBinder: !!! FAILED BINDER TRANSACTION !!! (parcel size = 3687084) 04-15 10:40:09.721 20654-20654/com.rarely1gmail.personas D/AndroidRuntime: Shutting down VM 04-15 10:40:09.725 20654-20654/com.rarely1gmail.personas E/AndroidRuntime: FATAL EXCEPTION: main Process: com.rarely1gmail.personas, PID: 20654 java.lang.RuntimeException: Failure from system at android.app.Instrumentation.execStartActivity(Instrumentation.java:1618) at android.app.Activity.startActivityForResult(Activity.java:4487) at android.support.v4.app.BaseFragmentActivityApi16.startActivityForResult(BaseFragmentActivityApi16.java:54) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:67) at android.app.Activity.startActivityForResult(Activity.java:4445) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:720) at android.app.Activity.startActivity(Activity.java:4806) at android.app.Activity.startActivity(Activity.java:4774) at com.rarely1gmail.personas.UserPrivateInfoSignUpActivity$1.onClick(UserPrivateInfoSignUpActivity.java:74) at android.view.View.performClick(View.java:6294) at android.view.View$PerformClick.run(View.java:24770) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) Caused by: android.os.TransactionTooLargeException: data parcel size 3687084 bytes at android.os.BinderProxy.transactNative(Native Method) at android.os.BinderProxy.transact(Binder.java:764) at android.app.IActivityManager$Stub$Proxy.startActivity(IActivityManager.java:4351) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1611) at android.app.Activity.startActivityForResult(Activity.java:4487) at android.support.v4.app.BaseFragmentActivityApi16.startActivityForResult(BaseFragmentActivityApi16.java:54) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:67) at android.app.Activity.startActivityForResult(Activity.java:4445) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:720) at android.app.Activity.startActivity(Activity.java:4806) at android.app.Activity.startActivity(Activity.java:4774) at com.rarely1gmail.personas.UserPrivateInfoSignUpActivity$1.onClick(UserPrivateInfoSignUpActivity.java:74) at android.view.View.performClick(View.java:6294) at android.view.View$PerformClick.run(View.java:24770) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
谢谢。
在两个活动之间传递Bitmap不是一个好主意。 当您尝试这样做时，您将收到TransactionTooLargeException 。 事务数据的最大限制大约为1MB，而Bitmap可能很容易超过它。 这可能会导致崩溃。
您可以通过以下代码使用您在onActivityResult()中获得的URI：
Uri selectedImage = data.getData();
在活动之间传递此URI。 然后，您可以使用按需URI加载图像，而不是传输整个Bitmap对象。
@SabaJafarzade谢谢指出，重用Uri。