通过bundle传递值并获取其他活动的值

Question

正如我在代码中看到的那样,我正在通过Bundle传递价值.
现在,我希望它在另一项活动中具有价值onCreate().我尝试了它的值,但它显示nullpointerexception.

请帮我解决问题.

Bundle bundle = new Bundle();
String url = "http://www.google.com";
bundle.putString("url", url);
Intent myIntent = new Intent(context, NotificationService.class);
myIntent.putExtras(bundle);
context.startService(myIntent);

获取价值代码:

if (!getIntent().getExtras().getString("url").contains(null)) {
        // Do something
}

Answer 1

这应该是程序.

使用bundle创建一个新的Intent并启动该活动.

Intent i = new Intent(context, ActivityName.class);
i.putExtra("key", mystring);
startActivity(i);

在onCreate中的新Activity中取这样的包

Bundle extras = getIntent().getExtras();
String value;
if (extras != null) {
  value = extras.getString("key");
}

Answer 2

嗨,我希望这段代码可以帮到你.

Bundle bundle = new Bundle();
bundle.putString("name", "Android");
bundle.putString("iname", "iPhone");
Intent intent = new Intent(getApplicationContext(), MyActivity.class);
intent.putExtras(bundle);
startActivity(intent);

在MyActivity.class中

public Bundle getBundle = null;
getBundle = this.getIntent().getExtras();
String name = getBundle.getString("name");
String id = getBundle.getString("iname");

Answer 3

if (getIntent().getExtras().getString("url") != null) {
        // retrieve the url
}

你必须检查空值