在活动之间传递额外内容并将其转发到单个活动

时间:2016-05-21 12:55:26

标签: android-intent android-activity onactivityresult startactivityforresult subactivity

我的应用程序是一个基本的登录应用程序,最后将显示其他活动中字段的所有值用户输入。我正在使用intent对象和标志。活动使用:

  • 存储键值的附加功能,
  • FLAG_ACTIVITY_FORWARD_RESULT
  • startActivityForResult()和onActivityForResult()方法

因此,名为AActivity,BActivity,Caactivity和导航流程的活动必须是:A→B→C→A,结果来自B和C.

我对代码逻辑的理解是,这告诉Android活动3应该将其结果转发回调用活动2的活动,在这种情况下活动1。并且当活动3设置其结果并结束时,将调用活动1中的onActivityResult(),并从活动3发送结果数据。

但是,当我运行应用程序时,我只从活动3获得结果,但是从活动2收到空值,活动2在活动1的TextView中显示为null,null,valueC,valueC,如图所示。 click for the image

我用谷歌搜索并搜索出现的类似问题,但无法解决问题。

提前感谢您的帮助

以下是我的代码:

AActivity:

public class AActivity extends AppCompatActivity {

private static final int REQUEST_CODE = 1;

Button btnStart;
TextView userDetails;

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

    userDetails = (TextView) findViewById(R.id.userdetails);
    btnStart = (Button) findViewById(R.id.btnstart);

    btnStart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent activityAIntent = new Intent(AActivity.this, BActivity.class);
            startActivityForResult(activityAIntent, REQUEST_CODE);
        }
    });
}


protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if ((requestCode == REQUEST_CODE) && (resultCode == RESULT_OK)) {

        String return_userName = data.getExtras().getString("username");
        String return_userPassword = data.getExtras().getString("password");
        String return_secretQuestion = data.getExtras().getString("secretquestion");
        String return_secretAnswer = data.getExtras().getString("secretanswer");
        userDetails.setText("Your details: " + return_userName + "," + return_userPassword +
                "," + return_secretQuestion + "," + return_secretAnswer);
    }
}

}

BActivity:

public class BActivity extends AppCompatActivity {

EditText userName,userPassword;
Button btnCancel,btnNext;

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

    userName=(EditText)findViewById(R.id.username);
    userPassword=(EditText)findViewById(R.id.userpassword);
    btnCancel=(Button)findViewById(R.id.btncancel);
    btnNext=(Button)findViewById(R.id.btnnext);

    btnCancel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_back_to_a = new Intent(BActivity.this,AActivity.class);
            startActivity(intent_back_to_a);
        }
    });

    btnNext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent activityCIntent = new Intent(BActivity.this,CActivity.class);
            activityBIntent.putExtra("username",userName.getText().toString());
            activityBIntent.putExtra("password",userPassword.getText().toString());
            intent_to_c.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
            startActivity(activityBIntent);
            finish();
        }
    });
}

}

CActivity:

public class CActivity extends AppCompatActivity {

EditText secretQuestion, secretAnswer;
Button btnCancel,btnNext;

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

    secretQuestion =(EditText)findViewById(R.id.secretquestion);
    secretAnswer =(EditText)findViewById(R.id.secretanswer);
    btnCancel =(Button)findViewById(R.id.btncancel);
    btnNext =(Button)findViewById(R.id.btnnext);

    btnCancel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_back_to_a = new Intent(CActivity.this,AActivity.class);
            startActivity(intent_back_to_a);
        }
    });

    btnNext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent data = new Intent(CActivity.this,AActivity.class);
            data.putExtra("secretquestion",secretQuestion.getText().toString());
            data.putExtra("secretanswer",secretAnswer.getText().toString());

            setResult(RESULT_OK,data);
            finish();
        }
    });
}

}

1 个答案:

答案 0 :(得分:1)

找到解决方案

您好。最后我弄清楚我做错了什么。所以,错误基本上是在活动C,我在那里创建一个新的意图并添加额外的东西以传递给活动A,而不是从2捕获转发的意图并添加额外的东西以与已经存在的意图合并。

修改了它并对活动A的onActivirtForResult()方法做了一些小改动,现在我完全得到了活动A中从其他活动输入的所有值。

希望我的解决方案对其他人也有帮助。所以变化如下:

在CActivity中:

 btnNext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent activityBIntent = getIntent();
            activityBIntent.putExtra("secretquestion",secretQuestion.getText().toString());
            activityBIntent.putExtra("secretanswer",secretAnswer.getText().toString());

            setResult(RESULT_OK,activityBIntent);
            finish();
        }
    });

并在AActivity中:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {
        case ACTIVITY1:
            if (resultCode == RESULT_OK) {

                String value_username = data.getExtras().getString("username");
                String value_password = data.getExtras().getString("password");
                String value_secretquestion = data.getExtras().getString("secretquestion");
                String value_secretanswer = data.getExtras().getString("secretanswer");
                userDetails.setText(value_username + value_password + value_secretquestion + value_secretanswer);
            }
            break;
    }
}