如何关闭 PereferenceActivity

Question

我试图在单击后退按钮后关闭首选项 activity..但是当我按下它然后单击多任务按钮时，我看到为我的应用程序打开了两个活动，我正在当前打开和我按下之前打开的 preferenceActvivty

这是我的代码

public class List extends PreferenceActivity {
 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getFragmentManager().beginTransaction().replace(android.R.id.content, new SetFrag()).commit();
}

public static class SetFrag extends PreferenceFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings_main);
    }
}
 @Override
public void onBackPressed() {
    super.onBackPressed();
    List.this.finish ();
}

感谢您的帮助。

Answer 1

我得到了解决方案，通常我们需要在调用 super.onBackPressed() 之前编码。

所以把你的代码改成这个

public class List extends PreferenceActivity {
// do some stuff
@Override
public void onBackPressed() {
List.this.finish ();
}

编辑：

所以这是我的最终答案将此自定义出口 activity 粘贴到您的包

public class ExitActivity extends Activity
{
@SuppressLint("NewApi")
@Override protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);

    if(android.os.Build.VERSION.SDK_INT >= 21)
    {
        finishAndRemoveTask();
    }
    else
    {
        finish();
    }
}

public static void exitApplication(Context context)
{
    Intent intent = new Intent(context, ExitActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NO_ANIMATION | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
    context.startActivity(intent);
}
}

在清单中添加

        <activity
        android:name=".ExitActivity"
        android:autoRemoveFromRecents="true"
        android:theme="@android:style/Theme.NoDisplay" />

并用

调用它

@Override
public void onBackPressed() {
ExitActivity.exitApplication(getApplicationContext());
}

祝你好运

Answer 2

问题已解决！！

步1:InMainActivity，添加标志"FLAG_ACTIVITY_NO_HISTORY"到Intent，然后启动SettingsActivity。

第2步：覆盖SettingsActivity(PreferenceActivity)的onBuildStartFragmentIntent()方法添加flag FLAG_ACTIVITY_FORWARD_RESULT，使activityresult可以return到MainActivity

如下图： @Override

public Intent onBuildStartFragmentIntent (String fragmentName,
                                       Bundle args,
                                       int titleRes,
                                       int shortTitleRes)
    {
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.setClass(this, getClass());
        intent.putExtra(EXTRA_SHOW_FRAGMENT, fragmentName);
        intent.putExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS, args);
        intent.putExtra(EXTRA_SHOW_FRAGMENT_TITLE, titleRes);
        intent.putExtra(EXTRA_SHOW_FRAGMENT_SHORT_TITLE, shortTitleRes);
        intent.putExtra(EXTRA_NO_HEADERS, true);
        intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);//the new statement
        return intent;
    }

如何关闭 PereferenceActivity

How to close PereferenceActivity

android

preferenceactivity

activity-finish