Question

我开发了一个允许以下内容的应用： 1.使用ImageView从库和视图加载图像。 2.将ImageView中的图像保存到图库中。 3.弹出警告对话框，单击“是”时将打开另一个布局。

我想将图像位图从第一个活动传递到第二个活动。我跟着几个例子，但图像没有通过。我的编码如下。

LoadImage.java：

public class LoadImage extends Activity {

private static final int SELECT_PICTURE = 1;

private String selectedImagePath;
private ImageView img;
Button buttonSave;
final Context context = this;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_load_image);

    img = (ImageView)findViewById(R.id.ImageView01);
    buttonSave = (Button) findViewById(R.id.button2);

    ((Button) findViewById(R.id.Button01))
            .setOnClickListener(new OnClickListener() {
                public void onClick(View arg0) {
                    Intent intent = new Intent();
                    intent.setType("image/*");
                    intent.setAction(Intent.ACTION_GET_CONTENT);
                    startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE);
                }
            });
    buttonSave.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {

            img.setDrawingCacheEnabled(true);
            Bitmap bitmap = img.getDrawingCache();

            String root = Environment.getExternalStorageDirectory().toString();
            File newDir = new File(root + "/PARSE");
            newDir.mkdirs();
            Random gen = new Random();
            int n = 10000;
            n = gen.nextInt(n);
            String fotoname = "Photo-"+ n +".jpg";
            File file = new File (newDir, fotoname);
            if (file.exists ()) file.delete ();
            try {
                FileOutputStream out = new FileOutputStream(file);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
                out.flush();
                out.close();
                Toast.makeText(getApplicationContext(), "Saved to your folder", Toast.LENGTH_SHORT).show();

            } catch (Exception e) {

            }
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);

            // set title
            alertDialogBuilder.setTitle("Review the Answer?");

            // set dialog message
            alertDialogBuilder
                    .setMessage("Click yes to submit answer!")
                    .setCancelable(false)
                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            // if this button is clicked, close
                            // current activity
                            Intent intent = new Intent(LoadImage.this, TestImage.class);
                            ByteArrayOutputStream bs = new ByteArrayOutputStream();

                            intent.putExtra("byteArray", bs.toByteArray());

                            startActivity(intent);

                    }
        })
                    .setNegativeButton("No",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {
                            // if this button is clicked, just close
                            // the dialog box and do nothing
                            dialog.cancel();
                        }
                    });

            // create alert dialog
            AlertDialog alertDialog = alertDialogBuilder.create();

            // show it
            alertDialog.show();
        }
    });

}



public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == SELECT_PICTURE) {
            Uri selectedImageUri = data.getData();
            selectedImagePath = getPath(selectedImageUri);
            System.out.println("Image Path : " + selectedImagePath);
            img.setImageURI(selectedImageUri);
        }

    }
}

public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}
}

TestImage.java：

public class TestImage extends Activity {


public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test_image);

    Intent intent = getIntent();


    ImageView img = (ImageView) findViewById(R.id.ImageView01);

    if(getIntent().hasExtra("byteArray")) {
        ImageView previewThumbnail = new ImageView(this);
        Bitmap bitmap = BitmapFactory.decodeByteArray(
                getIntent().getByteArrayExtra("byteArray"),0,getIntent().getByteArrayExtra("byteArray").length);
        previewThumbnail.setImageBitmap(bitmap);
    }

    Bundle extras = getIntent().getExtras();
    byte[] byteArray = extras.getByteArray("byteArray");

    Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
    img.setImageBitmap(bmp);
}
}

'意图'是第二个活动是灰色的，表明变量'intent'从未使用过。

有人可以帮我解决这个问题。任何帮助深表感谢。谢谢。

已更新！

LoadImage.java：

buttonSave.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {

            img.setDrawingCacheEnabled(true);
            final Bitmap bitmap = img.getDrawingCache();

            String root = Environment.getExternalStorageDirectory().toString();
            File newDir = new File(root + "/PARSE");
            newDir.mkdirs();
            Random gen = new Random();
            int n = 10000;
            n = gen.nextInt(n);
            String fotoname = "Photo-"+ n +".jpg";
            File file = new File (newDir, fotoname);
            if (file.exists ()) file.delete ();
            try {
                FileOutputStream out = new FileOutputStream(file);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
                out.flush();
                out.close();
                Toast.makeText(getApplicationContext(), "Saved to your folder", Toast.LENGTH_SHORT).show();

            } catch (Exception e) {

            }
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);

            // set title
            alertDialogBuilder.setTitle("Review the Answer?");

            // set dialog message
            alertDialogBuilder
                    .setMessage("Click yes to submit answer!")
                    .setCancelable(false)
                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            // if this button is clicked, close
                            // current activity
                            Intent intent = new Intent(LoadImage.this, TestImage.class);
                            ByteArrayOutputStream stream = new ByteArrayOutputStream();
                            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
                            byte[] bytes = stream.toByteArray();
                            intent.putExtra("bitmapbytes",bytes);

                            startActivity(intent);

                    }
        })
                    .setNegativeButton("No",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {
                            // if this button is clicked, just close
                            // the dialog box and do nothing
                            dialog.cancel();
                        }
                    });

            // create alert dialog
            AlertDialog alertDialog = alertDialogBuilder.create();

            // show it
            alertDialog.show();
        }
    });

}

TestImage.java：

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test_image);

    byte[] bytes = getIntent().getData().getByteArrayExtra("bitmapbytes");
    Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

    ImageView img = (ImageView) findViewById(R.id.ImageView01);


    img.setImageBitmap(bmp);
}
}

Answer 1

Bitmap实现了Parcelable，因此你总是可以在intent中传递它：

Intent intent = new Intent(this, NewActivity.class);
intent.putExtra("BitmapImage", bitmap);

并在另一端检索它：

Intent intent = getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("BitmapImage");

Answer 2

<强>活动

在Activites

之间传递位图

Intent intent = new Intent(this, Activity.class);
intent.putExtra("bitmap", bitmap);

并在“活动课程”

中

Bitmap bitmap = getIntent().getParcelableExtra("bitmap");

<强>片段

在片段之间传递位图

SecondFragment fragment = new SecondFragment();
Bundle bundle = new Bundle();
bundle.putParcelable("bitmap", bitmap);
fragment.setArguments(bundle);

在SecondFragment内部接收

Bitmap bitmap = getArguments().getParcelable("bitmap");

传输大位图（压缩位图）

如果您的活页夹事务失败，这意味着您将大型元素从一个活动转移到另一个活动，从而超出了活页夹事务缓冲区。

因此，在这种情况下，您必须将位图压缩为字节数组，然后在另一个活动中解压缩，就像这样

在FirstActivity中

Intent intent = new Intent(this, SecondActivity.class);

ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPG, 100, stream);
byte[] bytes = stream.toByteArray(); 
intent.putExtra("bitmapbytes",bytes);

以及SecondActivity

byte[] bytes = getIntent().getByteArrayExtra("bitmapbytes");
Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

Answer 3

是您可以通过Intent发送Bitmap

Intent intent = new Intent（Context，YourActivity.class）; intent.putExtra（＆＃34;键＆＃34;，位图）;

在YourActivity.class

中接收位图

Intent intent = getIntent（）; Bitmap image = intent.getParcelableExtra（＆＃34; key＆＃34;）;

这适用于小尺寸位图

当Bitmap的大小很大时，它将无法通过Intent发送。 Beacuse Intent意味着在密钥值对中发送一小组数据。

为此您可以通过Intent

发送位图的Uri

  Intent intent =new Intent(Context ,YourActivity.class);
  Uri uri;// Create the Uri From File Or From String.
  intent.putExtra("key",uri);

在YourActivity.class中

   Intent intent=getIntent();
   Uri uri=intent.getParcelableExtra("key");

从Uri创建位图。

希望它会对你有所帮助。

Answer 4

也许你的位图太大了。你会在你的logcat中找到FAILED BINDER TRANSACTION。所以，只需看看FAILED BINDER TRANSACTION while passing Bitmap from one activity to another

Android：位图图像不会传递给另一个Java活动

4 个答案: