将数据从一个活动中的两个不同意图传递到另一个活动

Question

如何从另一个活动中的不同意图传递不同的值。 即

活动A：

ButtonA .onclick {

    intent.putExtra("name", screenname);

    intent.putExtra("email", description);

    intent.putExtra("pic", twitterImage);

    startActivity(intent);

}

ButtonB。 的onClick {

    intent.putExtra("anothervalue", json_object.toString())

}

活动B：

  Intent intent = getIntent();

  String getValue = intent.getStringExtra("value from any of the button clicked")

Answer 1

虽然David Rauca回答基本上是正确的，但您可能会遇到NullPointerException 。

getIntent().getStringExtra("firstvalue")如果没有名称为'firstvalue'的值，将导致NPE。

您应该检查值是否存在。

if(getIntent().hasExtra("firstvalue")) {
    String firstvalue = getIntent().getStringExtra("firstvalue");
}

Answer 2

@Mandeep的回答是正确的。 但是如果你有更多来自活动的价值，那么这就是解决方案。 感谢Mandeep

Intent i = getIntent();
String getValue1,getValue2,getValue3;

if(i.hasExtra("AFirstValue") && i.hasExtra("ASecondValue") && i.hasExtra("AThirdValue")){ 

getValue1 = i.getStringExtra("AFirstvalue");
getValue2 = i.getStringExtra("ASecondValue");
getValue3 = i.getStringExtra("AThirdValue");

}

if(i.hasExtra("anotherFirstvalue") && i.hasExtra("anotherSecondvalue") && i.hasExtra("anotherThirdvalue")){

getValue1 = i.getStringExtra("anotherFirstvalue");
getValue2 = i.getStringExtra("anotherSecondvalue");
getValue3 = i.getStringExtra("anotherThirdvalue");

}

Answer 3

String getValue = intent.getStringExtra("firstvalue")  // in order to get the first value that was set when user clicked on buttonA

要么

String getValue = intent.getStringExtra("anothervalue")  // in order to get the the value that was set when user clicked on buttonB

Answer 4

Activity B代码应该是这样的

Intent intent = getIntent();
String firstvalue = intent.getStringExtra("firstvalue");
String anothervalue = intent.getStringExtra("anothervalue");

if(firstvalue != null)
    // called from Button A click
else if(secondvalue != null)
    // called from Button B click

Answer 5

Intent intent = getIntent();
String getValue = null;

if(intent.hasExtra("firstvalue")){ 

getValue = intent.getStringExtra("firstvalue");

}

if(intent.hasExtra("anothervalue")){

 getValue = intent.getStringExtra("anothervalue");

}