android - 想要将图像从一个 Activity 转移到另一个 Activity

Question

在这里，我有两个 Activity。在第一个 Activity 中，我想从图库中选择一张图片并将该图片传输到第二个 Activity 并设置该 Activity 的 ImageView 。

我有意将图像路径转移到另一个 Activity ，但它不适用于所有图像。我只能从图库中获取一些图片，对于一些图片，它会关闭我的应用程序或不显示任何内容并返回到第一个 Activity 。

我如何改进我的代码以适用于所有图像。我检查了很多次，我认为问题出在传输文件路径并将其放入另一个 Activity 中。

我的第一个 Activity :

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button choose;
    private Bitmap bitmap;

    private int PICK_IMAGE_REQUEST = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        choose = (Button) findViewById(R.id.choose);
        choose.setOnClickListener(this);
    }


    @Override
    public void onClick(View view) {
        if (view == choose) {
            showFileChooser();
        }
    }

    private void showFileChooser() {


        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
            Uri filePath = data.getData();


            try {
                //Getting the Bitmap from Gallery
                bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
                Intent i = new Intent(getApplicationContext(), SecondActivity.class);
                i.putExtra("picture", bitmap);
                startActivity(i);
                } 
            catch (IOException e) {
                e.printStackTrace();


            }
        }

    }
}

我的第二个 Activity

public class SecondActivity extends AppCompatActivity implements View.OnClickListener {

    ImageView image;
    Button upload;

    Bitmap bitmap;

    SharedPreferences sp;
    String rollno;

    private String UPLOAD_URL ="http://aptronnoida.com/applock/image_insert.php";


        private String KEY_Rollno = "rollno";
        private String KEY_IMAGE = "image";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
         image=(ImageView)findViewById(R.id.image);

         bitmap= getIntent().getParcelableExtra("picture") ;
         image.setImageBitmap(bitmap);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);


        upload = (Button) findViewById(R.id.upload);
        upload.setOnClickListener(this);
        sp=getSharedPreferences("rajput",MODE_PRIVATE);
        rollno=sp.getString("rollno",null);
    }



    @Override
    public void onClick(View view) {
        if(view == upload){
          uploadImage();
         }
    }

      public String getStringImage(Bitmap bmp){
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] imageBytes = baos.toByteArray();
        String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
        return encodedImage;
       }

    private void uploadImage() {

        final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
        StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
                new Response.Listener<String>() {
    @Override
            public void onResponse(String s) {
                 //Disimissing the progress dialog
                      loading.dismiss();
                       //Showing toast message of the response
                      Toast.makeText(SecondActivity.this, s , Toast.LENGTH_LONG).show();
                      }
                    },
                    new Response.ErrorListener() {
                       @Override
                      public void onErrorResponse(VolleyError volleyError) {
                          //Dismissing the progress dialog
                   loading.dismiss();

                        //Showing toast
                         Toast.makeText(SecondActivity.this, "Error", Toast.LENGTH_LONG).show();
            }
             }){
              @Override
               protected Map<String, String> getParams() throws AuthFailureError {
                  //Converting Bitmap to String
                  String image = getStringImage(bitmap);

                //Creating parameters
                  Map<String,String> params = new Hashtable<String, String>();

              //Adding parameters
                  /*params.put(KEY_Rollno,rollno);*/
                  params.put(KEY_IMAGE, image);


                  //returning parameters
                     return params;
                    }
};

          //Creating a Request Queue
        RequestQueue requestQueue = Volley.newRequestQueue(this);

          //Adding request to the queue
          requestQueue.add(stringRequest);
    }


    @Override
    public boolean onSupportNavigateUp(){
        onBackPressed();
        return true;
    }
    public void onBackPressed(){

        super.finish();
    }


}

Answer 1

您可以将图像路径而不是整个图像传递给second activity，并在初始化时将其加载到第二个activity。您可以使用 glide或 picasso如果库的使用对您来说不是问题，则用于加载图像的库。

步骤:

1. > get the path of image
2. 保存在字符串变量中
3. 创建一个Bundle对象，将路径字符串放入bundle中。
4. 使用该包开始第二个 Activity 。
5. 在第二个 Activity 中从包中获取路径值。最后，
6. 使用 glide 或 picasso 加载图像。