映像未在第二个活动中显示

fsi0uk1n  于 2021-07-05  发布在  Java
关注(0)|答案(2)|浏览(439)

当我单击时,按钮库打开,我选择了图像,但图像并没有显示在第二个活动中。几天来我一直在努力,但没有结果。请帮我查完整的代码。这是我的密码:
活动1

import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

import androidx.appcompat.app.AppCompatActivity;

public class HomepageActivity extends AppCompatActivity {

    private static final int SELECT_PHOTO = 1;
    private static int RESULT_LOAD_IMAGE = 1;

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_homepage);
        ImageButton buttonLoadImage = findViewById(R.id.btnphoto);
        buttonLoadImage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                Intent gallery = new Intent(Intent.ACTION_GET_CONTENT);
                gallery.setType("image/*");
                startActivityForResult(gallery, RESULT_LOAD_IMAGE);
            }

        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == SELECT_PHOTO) {
            if (resultCode == RESULT_OK) {
                Uri selectedImage = data.getData();
                if (selectedImage != null) {
                    Intent gallery = new Intent(HomepageActivity.this, ImageActivity.class);
                    Bundle extras = new Bundle();
                    extras.putString("image", selectedImage.toString());
                    gallery.putExtras(extras);
                    startActivity(gallery);

                }
            }
        }
}}```

Activity 2

公共类imageactivity扩展了appcompatactivity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image);
    Bundle extras = getIntent().getExtras();
    String name = extras.getString("image");
    Uri imageFinal=Uri.parse(name);

}}```
a9wyjsp7

a9wyjsp71#

在imageactivity oncreate方法中

ImageView imageView = findViewById(R.id.gallery_image);

   Bundle bundle = getIntent().getExtras();
   if(bundle != null) {
       String uriString = bundle.getString("image");
       Uri uri = Uri.parse(uriString);
       try {
           imageView.setImageBitmap(decodeUri(this,uri, 300));
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       }
   }

decodeuri是一种示例方法(仅适用于工作代码),用于调整图像大小,将其转换为位图并设置为imageview。如果图像大小很大,您可能会 java.lang.RuntimeException: Canvas: trying to draw too large(168709632bytes) bitmap. ```
public static Bitmap decodeUri(Context c, Uri uri, final int requiredSize)
throws FileNotFoundException {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(c.getContentResolver().openInputStream(uri), null, o);

int width_tmp = o.outWidth
        , height_tmp = o.outHeight;
int scale = 1;

while(true) {
    if(width_tmp / 2 < requiredSize || height_tmp / 2 < requiredSize)
        break;
    width_tmp /= 2;
    height_tmp /= 2;
    scale *= 2;
}

BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(c.getContentResolver().openInputStream(uri), null, o2);

}

活动\u gallery\u image.xml

<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".GalleryImageActivity">


</androidx.constraintlayout.widget.ConstraintLayout>

在onactivityresult中更改if statemtemt

if (requestCode == RESULT_LOAD_IMAGE)

xzv2uavs

xzv2uavs2#

尝试将图像转换为字节数组,然后将其传递给下一个活动(如bytearray)并使用它。

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