Question

我想创建一个小部件应用，添加后会启动ConfigurationActivity，其中有一些选项可供选择。

然后，您可以点击Next按钮转到NextActivity并配置您在第一个屏幕上选择的每个选项。

然后，单击Finish按钮并返回主屏幕，其中包含小部件。

可以通过我在XML中定义的配置活动来完成，或者我是否必须在startActivity中执行onEnabled()，然后以这种方式更新我的小部件？

感谢您的帮助。

Answer 1

您可以通过在xml中定义的配置活动完全执行此操作。只需让您的第一个活动启动一个转到第二个活动的意图，但使用startActivityForResult()方法。然后在第二个活动中，当用户单击第二个活动中的“完成”按钮时，将其设置为第二个活动调用finish()方法。但在调用完成之前，请将结果设置为您在第二个活动中收集的所有数据。然后，控制将返回到第一个活动，您可以在onActivityResult()方法中处理从第二个活动中获得的结果。然后，只需将第二个活动的结果添加到您将从此活动返回的结果中。

好吧，让我们来看看这个准系统的例子。

ConfigActivity1 extends Activity{

  protected onCreate(Bundle icicle){
    //do your setup stuff here.

    //This is the button that's going to take us to the next Config activity.
    final Button nextConfig = (Button)findViewById(R.id.next_config);
    //We'll add an onClickListener to take us to the second config activity
    nextConfig.setOnClickListener(new View.OnClickListener(){
      public void onClick(View view){
        //Construct Intent to launch second activity
        Intent furtherConfigIntent = new Intent(ConfigActivity1.this, ConfigActivity2.class);
        //By using startActivityForResult, when the second activity finishes it will return to
        //this activity with the results of that activity.
        startActivityForResult(furtherConfigIntent, 0);
      }
    });
    //finish any other setup in onCreate
  }

  //This is a callback that will get called when returning from any activity we started with the
  //startActivityForResult method
  protected void onActivityResult(int requestCode, int resultCode, Intent data){
    if(resultCode == Activity.RESULT_CANCELED){
      //this means the second activity wasn't successfull we should probably just 
      //return from this method and let the user keep configuring.
      return;
    }
    //ok, if we made it here, then everything went well in the second activity.
    //Now extract the data from the data Intent, compile it with the results from this
    //acitivity, and return them. Let's say you put them in an Intent called resultsIntent.
    setResult(Activity.RESULTS_OK, resultsIntent);
    finish();
  }


}

第二次活动将非常简单。只需收集配置数据，当用户按下完成后，将结果数据和resultCode设置为OK，然后完成。

一个具有多个配置活动的小部件（Android）

1 个答案: