Question

我有这个活动：

public class AMLoginActivity extends Activity implements IAsyncResponse {

    public static int finished;


    private final String TAG = "AMLoginActivity";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        finished = 0;

        Intent i = new Intent(AMLoginActivity.this, GDLoginActivity.class);
        i.putExtra("response", this);
        AMLoginActivity.this.startActivity(i);


    }

    public void processFinish(){
        finished++;
        Log.i(TAG, "Number finished: " + finished);


        if(finished == 1){
            Log.i(TAG, "All finished");
            AMLoginActivity.this.finish();
            Log.i(TAG, "Finish called");
        }

    }

调用GDLoginActivity登录谷歌硬盘。可以在下面看到：

public class GDLoginActivity extends Activity implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

    private static final String TAG = "GDLoginActivity";
    private static final int REQUEST_CODE_RESOLUTION = 3;

    private static GoogleApiClient mGoogleApiClient;


    @Override
    protected void onResume() {
        super.onResume();
        if (mGoogleApiClient == null) {
            // Create the API client and bind it to an instance variable.
            // We use this instance as the callback for connection and connection
            // failures.
            // Since no account name is passed, the user is prompted to choose.
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addApi(Drive.API)
                    .addScope(Drive.SCOPE_FILE)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .build();
            Log.i(TAG, "New GDClient created");
        }
        // Connect the client.
        mGoogleApiClient.connect();

    }

    @Override
    protected void onPause() {
        if (mGoogleApiClient != null) {
            mGoogleApiClient.disconnect();
        }
        super.onPause();
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        Log.i(TAG, "API client connected.");

        IAsyncResponse response = (IAsyncResponse) getIntent().getSerializableExtra("response");
        Log.i(TAG, "Process finish");
        response.processFinish();
        finish();
    }

    @Override
    public void onConnectionSuspended(int cause) {
        Log.i(TAG, "GoogleApiClient connection suspended");
    }


    @Override
    public void onConnectionFailed(ConnectionResult result) {
        // Called whenever the API client fails to connect.
        Log.i(TAG, "GoogleApiClient connection failed: " + result.toString());
        if (!result.hasResolution()) {
            // show the localized error dialog.
            GoogleApiAvailability.getInstance().getErrorDialog(this, result.getErrorCode(), 0).show();
            return;
        }
        // The failure has a resolution. Resolve it.
        // Called typically when the app is not yet authorized, and an
        // authorization
        // dialog is displayed to the user.
        try {
            result.startResolutionForResult(this, REQUEST_CODE_RESOLUTION);
        } catch (IntentSender.SendIntentException e) {
            Log.e(TAG, "Exception while starting resolution activity", e);
        }
    }


    public static  GoogleApiClient getGoogleApiClient(){
        return mGoogleApiClient;
    }

}

问题是当GDLoginActivity连接并结束（）时，它应该增加1并且还完成AMLoginActivity。它增加1并在processFinish（）中调用finish（），但没有任何反应，AMLoginActivity实际上没有关闭（即onDestroy（）永远不会被调用），所以我只剩下一个空白屏幕。如果我删除GDLoginActivity而只是调用processFinish（），那么AMLoginActivity就可以了，所以我认为它与GDLoginActivity有关，但这也与其他类似的活动有关。有任何想法吗？

编辑：此外，如果我点击空白屏幕上的后退按钮，它会调用AMLoginActivity的onDestroy（）方法并进入我想要的活动，如果这暗示了正在发生的事情的线索？

Answer 1

看起来你正在以奇怪的顺序完成它们。在完成启动它之前尝试完成可见活动。

  @Override
    public void onConnected(Bundle connectionHint) {
        Log.i(TAG, "API client connected.");

        IAsyncResponse response = (IAsyncResponse) getIntent().getSerializableExtra("response");
        Log.i(TAG, "Process finish");
        //finishes the previous activity
        response.processFinish();

        //finishes the visible activity
        finish();

        //try flipping this order ^
    }

如果您尝试完成另一项活动，则可以使用startActivitForResult()。

Answer 2

您需要先使用intent context将当前startActivity发送到另一项活动。之后，您可以从重定向的位置完成当前活动。

$(document).ready(function(){
    if($('#stname').val() == ""){
        $('#update').hide();
        $('#newstore').show();
    }
    else {
        $('#update').show();
        $('#newstore').hide();
    }
});

您可以使用一些方法，例如：

从活动A开始活动B

Intent intent = new Intent(this, FirstActivity.Class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish(); // Call once you redirect to another activity

如果用户点击修改按钮，请使用FLAG_ACTIVITY_CLEAR_TOP启动活动A.还要在额外标记中传递标记。

startActivity(new Intent(A.this, B.class));

如果用户点击修改按钮，请使用FLAG_ACTIVITY_CLEAR_TOP启动活动A.还要在额外标记中传递标记。

Intent i = new Intent(B.this, A.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i.putExtra("flag", "modify");
startActivity(i);
finish();

现在使用活动A的onCreate（）方法，写下代码。

Intent i = new Intent(B.this, A.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i.putExtra("flag", "add");
startActivity(i);
finish();

这是与切换活动相关的SO票证： android how to finish an activity from other activity

如果调用了其他活动，活动就没有完成

2 个答案: