将图像放入 Bundle

Question

如何将相机拍摄的图像保存在一个包中并将其移动到第二个 activity？我哪里做错了？

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CAM_REQUEST) {

        if (resultCode == RESULT_OK) {

            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");

            Intent i = new Intent(this, PostActivity.class);
            i.putExtra("name", thumbnail);
            startActivity(i);



        }
    }
}

Answer 1

有几种方法可以将位图传递给第二个 Activity

您可以通过 Bundle 表格 Intent。

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CAM_REQUEST) {
            if (resultCode == RESULT_OK) {    
                Bundle extras =  data.getExtras()    
                Intent i = new Intent(this, PostActivity.class);
                i.putExtra("extras", extras);
                startActivity(i);
            }
     }
}

并且在 PostActivity 中你可以调用

 Bundle extras = getIntent().getBundleExtra("extras")
 Bitmap thumbnail = (Bitmap) extras.get("data");

或者，如果您只想传递图像，则必须将位图转换为字节数组

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == CAM_REQUEST) {
                if (resultCode == RESULT_OK) {  
                    Intent intent = new Intent(this, PostActivity.class);
                    Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
                    ByteArrayOutputStream stream = new ByteArrayOutputStream();
                    thumbnail.compress(Bitmap.CompressFormat.PNG, 100, stream);
                    byte[] byteArray = stream.toByteArray();
                   intent.putExtra("image",byteArray);
                   startActivity(i);
               }
          }
}

或者你的方法应该也没错。您必须通过 getParcelableExtra(String) 方法获得 Bitmap。

 Bitmap thumbnail = getIntent().getParcelableExtra("data");

Answer 2

Bitmap 实现了 Parcelable，所以你应该使用：

Bitmap thumbnail = (Bitmap) data.getParcelableExtra("data");

将图像放入 Bundle

Putting an image to a Bundle

java

android

android-activity

android-bundle