相同的活动堆积

时间：2014-11-27 06:42:19

标签： java android android-activity stack activity-finish

我有一个活动，假设完成自己并关闭应用程序。现在，在某些情况下，根据用户导航到活动的方式不同，活动正在堆叠。当活动堆积起来时，将finish()或android.os.Process.killProcess(android.os.Process.myPid());或两者同时调用只会再次显示相同的活动。

清单：

<activity
            android:name="newActivities.HomeActivity"
            android:label="@string/title_activity_home"
            android:screenOrientation="portrait">
        </activity>

活动：

public class HomeActivity extends Activity {

    private EditText studentNameEdittext;
    private Button startYourStoryButton, loginButton, navCollegesButton, settingsButton, search_friends_button, browseStoriesButton;
    private TextView textView1;


    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
//      if (getFromPreference("loginStatus").equalsIgnoreCase("true")) {
//          finish();
//          saveInPreference("loginStatus", "");
//      }
        // Set up the action bar
        ActionBar bar = getActionBar();
        bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#009945")));
        bar.setTitle("Study Story");
        bar.setIcon(R.drawable.statusbar_icon);
        int titleId = getResources().getIdentifier("action_bar_title", "id", "android");
        TextView yourTextView = (TextView) findViewById(titleId);
        yourTextView.setTextColor(getResources().getColor(R.color.white_colour));
        yourTextView.setTypeface(TypeFaceController.titleFace(HomeActivity.this));



        // studentNameEdittext = (EditText)
        // findViewById(R.id.studentNameEdittext);
        startYourStoryButton = (Button) findViewById(R.id.startYourStoryButton);
        // loginButton = (Button) findViewById(R.id.loginButton);
        navCollegesButton = (Button) findViewById(R.id.navCollegesButton);
        // settingsButton = (Button) findViewById(R.id.settingsButton);
        // search_friends_button = (Button)
        // findViewById(R.id.search_friends_button);
        browseStoriesButton = (Button) findViewById(R.id.browseStoriesButton);
        // textView1 = (TextView) findViewById(R.id.textView1);

        // Set up font type
        // studentNameEdittext.setTypeface(TypeFaceController.generalTextFace(HomeActivity.this));
        startYourStoryButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
        // loginButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
        navCollegesButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
        // settingsButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
        // search_friends_button.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
        browseStoriesButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
        // textView1.setTypeface(TypeFaceController.titleFace(HomeActivity.this));

        startYourStoryButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0){
                Intent i = new Intent(HomeActivity.this, SignUp.class);
                i.putExtra("signUpCaller", "Home");
                startActivity(i);
            }
        });

        // loginButton.setOnClickListener(new View.OnClickListener() {
        //
        // @Override
        // public void onClick(View arg0){
        // Intent i = new Intent(HomeActivity.this, Login.class);
        // startActivity(i);
        // }
        // });

        // search_friends_button.setOnClickListener(new View.OnClickListener() {
        //
        // @Override
        // public void onClick(View v){
        // Intent i = new Intent(HomeActivity.this,
        // FindStudentBrowseStoryActivity.class);
        // i.putExtra("Button", "search_friends_button");
        // i.putExtra("searchString", studentNameEdittext.getText().toString());
        // startActivity(i);
        //
        // }
        // });

        browseStoriesButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v){
                Intent i = new Intent(HomeActivity.this, FindStudentBrowseStoryActivity.class);
                i.putExtra("Button", "browseStoriesButton");
                startActivity(i);

            }
        });

        navCollegesButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v){
                Intent i = new Intent(HomeActivity.this, CollegeListActivity.class);
                startActivity(i);

            }
        });

        // settingsButton.setOnClickListener(new View.OnClickListener() {
        //
        // @Override
        // public void onClick(View v){
        // Intent i = new Intent(HomeActivity.this, HomeSettingsActivity.class);
        // i.putExtra("FromActivity", "HomeSettingsActivity");
        // startActivity(i);
        // finish();
        //
        // }
        // });

    }

//  @Override
//  protected void onStart(){
//      if (getFromPreference("loginStatus").equalsIgnoreCase("true")) {
//          finish();
//      }
//      super.onStart();
//  }
//
//  @Override
//  protected void onResume(){
//      if (getFromPreference("loginStatus").equalsIgnoreCase("true")) {
//          finish();
//      }
//      super.onResume();
//  }

    // =========Login button action bar
    @Override
    public boolean onCreateOptionsMenu(Menu menu){
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.home_menu, menu);
        return true;
    }

    // =========Login button action bar
    @Override
    public boolean onOptionsItemSelected(MenuItem item){
        // handle item selection
        switch (item.getItemId()) {
        case R.id.home_login_string:
            Intent i = new Intent(HomeActivity.this, Login.class);
            // finish();
            startActivity(i);
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    // logic to fix logout

    @Override
    public void onBackPressed(){
//      Intent startMain = new Intent(Intent.ACTION_MAIN);
//      startMain.addCategory(Intent.CATEGORY_HOME);
//      startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);;
//      startActivity(startMain);
//
//       int pid = android.os.Process.myPid(); //
//       android.os.Process.killProcess(pid); // return; }
        android.os.Process.killProcess(android.os.Process.myPid());
        finish();
    }

    // method to save variable in preference
    public void saveInPreference(String name, String content){
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putString(name, content);
        editor.commit();
    }

    // getting content from preferences
    public String getFromPreference(String variable_name){
        String preference_return;
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        preference_return = preferences.getString(variable_name, "");

        return preference_return;
    }
}

请告诉我哪里出错了？为什么活动堆叠？

P.S：我们不能使用单顶等，因为它会导致现有自定义主题出现一些过渡问题！

4 个答案:

答案 0 :(得分：1)

获取一个扩展Application的应用程序类，并获取一个arrayList并维护arraylist中活动的引用。

当您在所需活动中单击后退按钮时，使用arraylist完成所有活动。

参加一项基础活动。这是所有活动的超级类

public class BaseActviity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    App application = (App) getApplication();
    application.addActivity(this);
  }
}

Take one application class 

public class App extends Application {
public App() {
    if (listActivty == null) {
        listActivty = new ArrayList<BaseActviity>();
  }
}

public ArrayList<BaseActviity> listActivty;

public void addActivity(BaseActviity actviity) {
    if (!listActivty.contains(actviity)) {
        listActivty.add(actviity);
    }
  }
 } 

take 4 samples activity classes like ......

1) public class FirstActivity extends BaseActviity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.first);
}

public void send(View view) {
    Intent intent = new Intent(this, SecondActivity.class);
    startActivity(intent);
 }
}
2) public class SecondActivity extends BaseActviity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.first);
 }

public void send(View view) {
    Intent intent = new Intent(this, ThirdActivity.class);
    startActivity(intent);
 }
}
 3).........................
 4) ............................
 in 4 th activity class placed the following code

In desire activity that means final activity,override the onBackPressed

 public void onBackPressed() {

    super.onBackPressed();
    App application = (App) getApplication();
    ArrayList<BaseActviity> listActivty = application.listActivty;
    for (BaseActviity actviity : listActivty) {
        actviity.finish();

     }
}

答案 1 :(得分：0)

无论您何时打开堆积的活动，请使用：

intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

答案 2 :(得分：0)

检查用户点击后退按钮时最后一次活动的活动是否可见，是否可见使用

System.exit(0);

答案 3 :(得分：0)

最后，问题解决了。我必须做一个小技巧：

ParseUser.getCurrentUser();
        ParseUser.logOut();
        Intent i = new Intent(getActivity(), NewHomeActivity.class);
        i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        getActivity().startActivity(i);
        getActivity().finish();

这也不会导致任何过渡问题。

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