从另一个 Activity 导航回来时，Android Activity onCreate 被调用两次

Question

我有一个应用程序，在用户通过 OAuth 对 webview Activity 进行身份验证后生成音乐，看起来像这样:主要播放器 Activity -OAuth Activity -返回到主要播放器 Activity 。但是，从 OAuth Activity 开始时会调用两次 onCreate 方法，导致同时生成和播放两个音轨。以下是 MainActivity 中的部分代码:

public class MainActivity extends Activity {
int pitch=60;
private static final float VISUALIZER_HEIGHT_DIP = 50f;
Random rn;

boolean isRunning = true;  
boolean isPlaying=false;
SeekBar fSlider;
double sliderval;
MediaPlayer mediaPlayer=new MediaPlayer();
ImageButton startStopButton;
ImageButton stopButton;
SeekBar vSlider;
VisualizerView mVisualizerView;
private Visualizer mVisualizer;
ImageButton connectButton;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
   // point the slider to the GUI widget
    rn = new Random();
    fSlider = (SeekBar) findViewById(R.id.frequency);        
    fSlider.setProgress(0);
    vSlider= (SeekBar) findViewById(R.id.seekBar2);
    vSlider.setMax(10);
    vSlider.setProgress(0);
    TextView viewinterval=(TextView) findViewById(R.id.textView2);     
    viewinterval.setText("");
    startStopButton=(ImageButton) findViewById(R.id.imageButton2);
    View activity= this.findViewById(R.id.playerActivity); 
    stopButton=(ImageButton) findViewById(R.id.imageButton1);
    RelativeLayout.LayoutParams params= new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, (int)(VISUALIZER_HEIGHT_DIP * getResources().getDisplayMetrics().density));
    params.addRule(RelativeLayout.BELOW, R.id.seekBar2);
    mVisualizerView = new VisualizerView(this);
    mVisualizerView.setLayoutParams(params);
    ((ViewGroup) activity).addView(mVisualizerView);
    connectButton=(ImageButton) findViewById(R.id.imageButton3);
    connectButton.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View arg0) {
            mediaPlayer.pause();
            Intent intent= new Intent(getApplicationContext(), WebViewActivity.class);
            startActivity(intent);
        }           
    });
    if(riskscores.length !=0){
        viewinterval.setText("generating audio");
        new MIDISequence().execute();           
    }
   };

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}


@Override
protected void onPause() {
    super.onPause();
    if(mediaPlayer.isPlaying()){
        mediaPlayer.pause();
    }
}

class MIDISequence extends AsyncTask<String,Void,String>{

这是我的 OAuth Activity 的代码

public class WebViewActivity extends Activity {
private WebView gWebView;
final String REDIRECT_URI = "https://localhost:5000/receive_code";
final String CLIENT_ID = "can't post it here";
final String CLIENT_SECRET = "can't post it here";
final String SCOPE = "basic names genomes analyses";

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.webview);

    gWebView = (WebView) findViewById(R.id.webView1);

    gWebView.loadUrl("https://api.23andme.com/authorize/?redirect_uri="
            + REDIRECT_URI + "&response_type=code&client_id=" + CLIENT_ID
            + "&scope=" + SCOPE);

    Log.d("WEBVIEW", "got to webpage");

    gWebView.setWebViewClient(new WebViewClient() {

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            if (url.startsWith(REDIRECT_URI)) {
                Log.d("WEBVIEW", "onpagefinished is called");
                System.out.println("got to override");
                if (url.indexOf("code=") != -1) {
                    //if the query contains code
                    String queryString = null;
                    try {
                        queryString = new URL(url).getQuery();
                    } catch (MalformedURLException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    System.out.println(queryString);
                    String[] params = queryString.split("&");
                    String code = null;
                    for (String param : params) {
                        if (param.startsWith("code=")) {
                            code = param.substring(param.indexOf('=') + 1);
                        }
                    }
                    gWebView.setVisibility(View.GONE);
                    new PostRequest().execute(code);
                    // don't go to redirectUri
                }
            }
        }
    });


}
class PostRequest extends AsyncTask<String,Void,String>{


    @Override
    protected String doInBackground(String... params) {
               code retrieving client data.....


            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                System.out.println("CPE" + e);
            } catch(SocketException ex)
               {
                 Log.e("Error : " , "Error on soapPrimitiveData() " + ex.getMessage());
                   ex.printStackTrace();
                   return "error occured";
               } catch (JSONException e) {
                e.printStackTrace();
                return "error occured";
            } catch (IllegalStateException e) {
                e.printStackTrace();
                return "error occured";
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return "error occured";
            }
        }
        return "request complete";
    }

    @Override
    protected void onPostExecute(String result) {       
        super.onPostExecute(result);
        Log.d("Post result", result);
        Intent intent = new Intent(getApplicationContext(), MainActivity.class);
        startActivity(intent);
    }

}

}MainActivity 的 onCreate 方法由于某种原因被调用了两次...这是怎么回事？

Answer 1

您的实现似乎有误。问题是，您正在尝试使用 Intent 对象导航回您的 MainActivity 表单 WebActvitity。这是个问题。你不应该那样做。

每当您想返回到之前的 Activity 时，只需在当前 Activity 中调用 finish() 即可。

在我们的场景中，通过在您的 WebActivity 中使用 Intent，您正在为您的 MainActivity 创建一个新实例，该实例已经存在于堆栈(后台)中。只需在 WebActivity 中调用 finish() 即可将其关闭，并且您的 MainActivity 应该可见。

做以下改变，

@Override
protected void onPostExecute(String result) {       
    super.onPostExecute(result);
    Log.d("Post result", result);
    Intent intent = new Intent(getApplicationContext(), MainActivity.class);
    startActivity(intent);
}

像这样替换上面的方法，

@Override
protected void onPostExecute(String result) {       
    super.onPostExecute(result);
    Log.d("Post result", result);
    finish();
}