使用 onactivityresult android

Use onactivityresult android

提问by Chinmay Dabke

I want to call a method from mainactivityin other activities. For that, I've researched a lot and found that using OnActivityResultis the best option. Can anyone please explain how to use this method with the help of an example? I've gone through similar questions but found them confusing. Thanks!

我想从mainactivity其他活动中调用方法。为此，我进行了大量研究，发现使用OnActivityResult是最好的选择。任何人都可以在示例的帮助下解释如何使用此方法吗？我经历过类似的问题，但发现它们令人困惑。谢谢！

EDIT:I have a custom dialog activity in my app. It asks the users whether they want to start a new game or not and it has two buttons yes and no. I want to implement the above method only to get the pressed button.

编辑：我的应用程序中有一个自定义对话框活动。它询问用户是否要开始新游戏，它有两个按钮是和否。我想实现上述方法只是为了获得按下的按钮。

回答by Sonu Singh Bhati

Define constant

定义常量

public static final int REQUEST_CODE = 1;

Call your custom dialog activity using intent

使用意图调用您的自定义对话活动

Intent intent = new Intent(Activity.this,
                    CustomDialogActivity.class);
            startActivityForResult(intent , REQUEST_CODE);

Now use onActivityResult to retrieve the result

现在使用 onActivityResult 来检索结果

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

            if (requestCode == REQUEST_CODE  && resultCode  == RESULT_OK) {

                String requiredValue = data.getStringExtra("key");
            }
        } catch (Exception ex) {
            Toast.makeText(Activity.this, ex.toString(),
                    Toast.LENGTH_SHORT).show();
        }

    }

In custom dialog activity use this code to set result

在自定义对话框活动中使用此代码设置结果

Intent intent = getIntent();
intent.putExtra("key", value);
setResult(RESULT_OK, intent);
finish();

回答by Md. Zakir Hossain

Start the Activity:

开始活动：

you do need to pass an additional integer argument to the startActivityForResult()method.You may do it by defining a constant or simply put an integer.The integer argument is a "request code" that identifies your request. When you receive the result Intent, the callback provides the same request code so that your app can properly identify the result and determine how to handle it.

您确实需要startActivityForResult()向该方法传递一个额外的整数参数。您可以通过定义一个常量或简单地放置一个整数来实现。整数参数是一个“请求代码”，用于标识您的请求。当您收到结果 Intent 时，回调会提供相同的请求代码，以便您的应用程序可以正确识别结果并确定如何处理它。

static final int ASK_QUESTION_REQUEST = 1;
// Create an Intent to start SecondActivity
Intent askIntent = new Intent(FirstActivity.this, SecondActivity.class);

// Start SecondActivity with the request code
startActivityForResult(askIntent, ASK_QUESTION_REQUEST);

Return The Result:

返回结果：

After completing your work in second activity class simply set the result and call that activity where it comes from and lastly don't forget to write finish()statement.

在第二个活动类中完成您的工作后，只需设置结果并在其来源处调用该活动，最后不要忘记编写finish()语句。

// Add the required data to be returned to the FirstActivity
            sendIntent.putExtra(Result_DATA, "Your Data");

            // Set the resultCode to Activity.RESULT_OK to
            // indicate a success and attach the Intent
            // which contains our result data
            setResult(RESULT_OK, sendIntent);

            // With finish() we close the SecondActivity to
            // return to FirstActivity
            finish();

Receive The Result:

接收结果：

When you done with the subsequent activity and returns, the system calls your activity's onActivityResult()method. This method includes three arguments:

当您完成后续活动并返回时，系统会调用您的活动的onActivityResult()方法。该方法包括三个参数：

@The request code you passed to startActivityForResult(). @A result code specified by the second activity. This is either RESULT_OKif the operation was successful or RESULT_CANCELEDif the operation failed @An Intent that carries the result data.

@您传递给的请求代码startActivityForResult()。@第二个活动指定的结果代码。这要么RESULT_OK是操作成功，要么RESULT_CANCELED是操作失败@An Intent 携带结果数据。

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

    // check if the request code is same as what is passed  here it is 1
    if (requestCode == ASK_QUESTION_REQUEST) {
        // Make sure the request was successful
        if (resultCode == RESULT_OK) {
            final String result = data.getStringExtra(SecondActivity.Result_DATA);

            // Use the data - in this case display it in a Toast.
            Toast.makeText(this, "Result: " + result, Toast.LENGTH_LONG).show();
        }
    }
}

回答by Shraddha Patel

1.In your FirstActivity class write following code for the move to second activity using Intent.

1.在您的 FirstActivity 类中，为使用 Intent 移动到第二个活动编写以下代码。

Intent i = new Intent(this, SecondActivity.class);
startActivityForResult(i, 100);

2.In your secondActivity class write following code for onClick Event For ex: In secondActivity if you want to send back data:

2.在您的 secondActivity 类中为 onClick 事件编写以下代码例如：如果您想发回数据，请在 secondActivity 中：

Intent intent= new Intent();
intent.putExtra("result",result);
setResult(RESULT_OK,intent);
finish();

3.Now in your FirstActivity class write following code for the onActivityResult() method.

3.现在在您的 FirstActivity 类中为 onActivityResult() 方法编写以下代码。

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    if (requestCode == 100 && resultCode == Activity.RESULT_OK){
            String result=data.getStringExtra("result");
            Log.e("Result",result);
    }
}

回答by Aung Htet Kyaw

This is my example.

这是我的例子。

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == Image_Request_Code && resultCode ==RESULT_OK && data != null && data.getData() != null) {

            FilePathUri = data.getData();

            try {

                // Getting selected image into Bitmap.
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), FilePathUri);

                // Setting up bitmap selected image into ImageView.
                SelectImage.setImageBitmap(bitmap);

                // After selecting image change choose button above text.
                ChooseButton.setText("Image Selected");

            }
            catch (IOException e) {

                e.printStackTrace();
            }
        }*strong text*