如何将图像从活动B传递给后面的活动A通过共享偏好进行按下android

Question

如果我更改了第二个活动的图像，并且当我返回到上一个活动时图像应该被改变。

https://i.stack.imgur.com/7bTnj.png

Answer 1

尝试自定义代码中下面的代码。它会起作用。

这是您想要跟踪的第一个活动，如果图像已更改并且想要加载更改的图像。

public class A extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_a); 
     //YOUR OTHER CODE HERE.. 

     startActivityForResult(new Intent(A.this, B.class), 111); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == 111 && resultCode == RESULT_OK) { 
      if (data.getExtras() != null) { 
       //set your image path which has been returned by previous activity to your imageview here 
       //data.getExtras().getString("image_path") 
      } 
     } 
     super.onActivityResult(requestCode, resultCode, data); 
    } 
} 

这是你的未来，你正在改变图像

public class B extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_b); 
     //YOUR OTHER CODE HERE.. 
    } 

    @Override 
    public void onBackPressed() { 
     Intent intent = new Intent(); 
     intent.putExtra("image_path", "CHANGED_IMAGE_PATH"); 
     setResult(RESULT_OK, intent); 
     super.onBackPressed(); 
    } 
}