如何将包含Bitmap的对象传递给另一个活动

时间:2018-04-15 10:31:46

标签: java android android-activity bitmap parcelable

所以我是Android开发中的新手,我试图制作一个注册活动(UserPrivateInfoSignUpActivity.java)来加载图片(Bitmap)并创建一个我想要的UserPersona对象传递到另一个活动(UserGeneralDataSignUpActivity)。

我对解决方案进行了研究,但我仍然无法传递Bitmap图像,尽管它已经是implements Parcelable

有什么建议吗? 这是我的代码(没有getter& setters)

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<PersonaUser> CREATOR = new Parcelable.Creator<PersonaUser>() {
    @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 (我要检索用户对象的位置)

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Activity我的应用程序崩溃。

Demo

    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) 

感谢。

1 个答案:

答案 0 :(得分:3)

在两个活动之间传递Bitmap不是一个好主意。当你试图这样做时,你会得到TransactionTooLargeException。事务数据的最大限制大约为1MB,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感谢您指出,重用Uri。