意向putExtra从两个活动 [英] Intent putExtra from two Activities

问题描述

您好，我希望你能帮助我：

我有三个活动：活性1 - ＆GT;活性2 - ＆GT; Activity3

在活动1和2我有一个意图，它把一个字符串从一个EditText额外费用。

而在Activity3我想收到两个字符串，但我尽量只Activity3收到活性2（在previous活动）。该意向

在这里，code从活动1：

 公共无效的onClick（视图v）{    意向意图=新意图（这一点，Activity2.class）;
    ET1的EditText =（EditText上）findViewById（R.id.editText1）;
    字符串名称= et1.getText（）的toString（）。        如果（name.length（）== 0）{
            新AlertDialog.Builder（本）.setMessage（
                    R.string.error_name_missing）.setNeutralButton（
                    R.string.error_ok，
                    NULL）.show（）;
            返回;
        }        intent.putExtra（konto_name1，名）;
        startActivity（意向）;    }
 

从活性2：

 公共无效的onClick（视图v）{        意向意图=新意图（这一点，Activity3.class）;
        ET2的EditText =（EditText上）findViewById（R.id.editText2）;        字符串值= et2.getText（）的toString（）。        如果（value.length（）== 0）{
            新AlertDialog.Builder（本）.setMessage（
                    R.string.error_value_missing）.setNeutralButton（
                    R.string.error_ok，
                    NULL）.show（）;
            返回;
        }        intent.putExtra（start_value1，值）;
        startActivity（意向）;
    }
 

解决方案

您可以刚刚从意图传递给意图，因为其他的答案讨论。然而，你也可以使用共享preferences ，使其更易于使用。

 共享preferences preFS = getDefaultShared preferences（本）;
编辑编辑= prefs.edit（）;
edit.putString（konto_name1，名）
edit.commit（）;
 

或者，如果你想它作为一个班轮：

preferenceManager.getDefaultShared preferences（本）.edit（）putString（konto_name1，名）.commit（）;

然后，而不是从意向获取字符串，只需使用：

 共享preferences preFS = preferenceManager.getDefaultShared preferences（本）;
字符串newString = prefs.getString（konto_name1，）;
 

这会做你想要什么，而不必从保持意图意图，这是我用来寻找恼人传递的字符串的赛道上最好的。

此外，上面只有一行：

preferenceManager.getDefaultShared preferences（本）.getString（konto_name1，）;

您应该做同样与活性2字符串。别担心，每次你的项目被点击活动时间（1/2）在preference将被覆盖。请注意，在的getString（）第二个参数是的情况下，默认的字符串要检索不存在的人。

Hello I hope you can help me:

I have three Activities: Activity1 --> Activity2 --> Activity3

In Activity1 and 2 I have an Intent, which put a string from an EditText Extra.

And in Activity3 I want to receive BOTH strings, but as I try Activity3 only receive the Intent from Activity2 (the previous activity).

Here the code from Activity1:

public void onClick(View v) {

    Intent intent = new Intent (this, Activity2.class);
    EditText et1 = (EditText) findViewById(R.id.editText1);
    String name = et1.getText().toString();

        if (name.length() == 0) {
            new AlertDialog.Builder(this).setMessage(
                    R.string.error_name_missing).setNeutralButton(
                    R.string.error_ok,
                    null).show();
            return;
        }

        intent.putExtra(konto_name1, name);
        startActivity(intent);

    }   

From Activity2:

public void onClick(View v) {

        Intent intent = new Intent (this, Activity3.class); 
        EditText et2 = (EditText) findViewById(R.id.editText2);

        String value = et2.getText().toString();

        if (value.length() == 0) {
            new AlertDialog.Builder(this).setMessage(
                    R.string.error_value_missing).setNeutralButton(
                    R.string.error_ok,
                    null).show();
            return;
        }

        intent.putExtra(start_value1, value);
        startActivity(intent);      
    }

解决方案

You can just pass from Intent to Intent, as the other answers discuss. However you can also use SharedPreferences to make it easier to work with.

SharedPreferences prefs = getDefaultSharedPreferences(this);
Editor edit = prefs.edit();
edit.putString(konto_name1, name)
edit.commit();

Or if you wanted it as a one-liner:

PreferenceManager.getDefaultSharedPreferences(this).edit().putString(konto_name1, name).commit();

Then instead of getting the string from the Intent, just use:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String newString = prefs.getString(konto_name1, "");

That'll do what you want, without having to keep track of strings passed from Intent to Intent, which I used to find annoying at best.

Again, above as a one-liner:

PreferenceManager.getDefaultSharedPreferences(this).getString(konto_name1, "");

You should do the same with the String in Activity2. Don't worry, every time your item is clicked in Activity(1/2) the preference will be overwritten. Note that the second parameter in getString() is a default String in case the one you want to retrieve doesn't exist.

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