Question

我有一个带有recyclerview的活动。在recyclerview的适配器中，当用户单击元素时，会创建一个新的片段。问题是，当我按下主页按钮，杀死应用程序进程然后恢复应用程序时，不会重新创建该分段。如何在应用程序进程被杀后恢复片段？

编辑：

活动中的onCreate方法：

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

        context = this;

        rvMain = (RecyclerView) findViewById(R.id.rvMain);
        rvMain.setLayoutManager(new LinearLayoutManager(context));
        MainAdapter adapter = new MainAdapter(numbers, context);
        rvMain.setAdapter(adapter);
    }

在recyclelerview适配器中的onBindViewHolder方法，其中调用了fragment：

    @Override
    public void onBindViewHolder(MainViewHolder holder, final int position) {
        final Number number = numbers.get(position);

        holder.lytMain.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DetailedFragment fragment = new DetailedFragment();
                Bundle bundle = new Bundle();
                bundle.putString("message", number.getName());
                fragment.setArguments(bundle);

                ((MainActivity) context).getSupportFragmentManager().beginTransaction()
                        .addToBackStack("fragment")
                        .replace(R.id.lytDetailed, fragment)
                        .commit();

            }
        });


    }

Answer 1

我找到了一个解决方案，我将一个片段调用到MainActivity中的一个方法，然后用onSaveInstanceState保存片段实例并用onRestoreInstanceState恢复它。这是它的外观。

适配器中的onBindViewHolder：

    @Override
    public void onBindViewHolder(MainViewHolder holder, final int position) {
        final Number number = numbers.get(position);

        holder.lytMain.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ((MainActivity)context).getFragment(number);
            }
        });
    }

MainActivity中的

getFragment（）方法：

    public void getFragment(Number number){
        fragment = new DetailedFragment();
        Bundle bundle = new Bundle();
        bundle.putString("message", number.getName());
        fragment.setArguments(bundle);

        getSupportFragmentManager().beginTransaction()
                .addToBackStack("fragment")
                .replace(R.id.lytDetailed, fragment)
                .commit();
    }

onSaveInstanceState和onRestoreInstanceState：

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        getSupportFragmentManager().putFragment(outState, "detailed_fragment", fragment);
    }

    @Override
    protected void onRestoreInstanceState(Bundle outState) {
        super.onRestoreInstanceState(outState);
            fragment = (DetailedFragment) getSupportFragmentManager()
                    .getFragment(outState, "detailed_fragment");

            getSupportFragmentManager().beginTransaction()
                    .addToBackStack("fragment")
                    .replace(R.id.lytDetailed, fragment)
                    .commit();
    }

应用程序进程被终止后，片段未恢复

1 个答案: