启动激活时接收"no apps can perform this action"

Question

，所以我正在尝试运行一个活动，并且在单击片段中的按钮时，我得到了"没有应用程序可以执行此操作"。

第一个主要活动意图声明：

 Intent setTable = new Intent(this, setTable.class);

按按钮单击运行的方法：

@Override
public void miscNext(){
    startActivity(setTable);
}

单击时片段按钮：

next.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                for(int i = 0; i < data.getDays(); i++){
                    String tempChecker = miscNum[i].getText().toString();
                    if(!tempChecker.isEmpty()){
                        data.setBreaks(i, Integer.parseInt(miscNum[i].getText().toString()));
                    } else{
                        break;
                    }
                    if(i == (data.getDays() - 1)){
                        data.setDoneNames(true);
                    }
                }
                data.initNamesArray();
                if(data.isDoneNames()){
                    activityCommander.miscNext();
                }
            }
        });

另一个活动，默认选项卡式活动仅占用：

protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_set_table);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);
        final TextView day           = new TextView(getApplicationContext());
        final Spinner  spinnerList[] = new Spinner[data.getSessions(mViewPager.getCurrentItem())];
        final TextView session[]     = new TextView[data.getSessions(mViewPager.getCurrentItem())];
        day.setText(getDay(data.getFirstDay() + mViewPager.getCurrentItem()));
        mViewPager.addView(day);
        //Rules
        LinearLayout.LayoutParams spinner = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT);
        LinearLayout.LayoutParams dayRule = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, data.getNamesArray());
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        for(int i = 0; i < data.getDays(); i++){
            spinnerList[i] = new Spinner(getApplicationContext());
            session[i] = new TextView(getApplicationContext());
            spinnerList[i].setAdapter(adapter);
            mViewPager.addView(session[i], dayRule);
            mViewPager.addView(spinnerList[i], spinner);
        }

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

和logcat

11-23 14:21:07.865 9531-9531/com.example.user.timetable_test I/Timeline: Timeline: Activity_launch_request id: time:27674782
11-23 14:21:15.630 9531-9531/com.example.user.timetable_test V/ActivityThread: updateVisibility : ActivityRecord{7612187 token=android.os.BinderProxy@942882f {com.example.user.timetable_test/com.example.user.timetable_test.setup.Set_Up}} show : false
11-23 14:21:19.375 9531-9761/com.example.user.timetable_test D/mali_winsys: new_window_surface returns 0x3000,  [1440x2560]-format:1
11-23 14:21:19.385 9531-9531/com.example.user.timetable_test W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
11-23 14:21:19.385 9531-9531/com.example.user.timetable_test W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
11-23 14:21:19.385 9531-9531/com.example.user.timetable_test W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
11-23 14:21:19.385 9531-9531/com.example.user.timetable_test W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
11-23 14:21:19.385 9531-9531/com.example.user.timetable_test W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
11-23 14:21:19.400 9531-9531/com.example.user.timetable_test I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@942882f time:27686319

这可能有点脱离话题，但是有人知道如何在选项卡上添加窗口小部件吗？

Answer 1

如果您更改

会发生什么情况

@Override
public void miscNext(){
    startActivity(setTable);
}

@Override
public void miscNext(){
    startActivity(new Intent(this, setTable.class));
}

顺便说一句，如果我很好地理解，Overriden方法public void miscNext()在活动范围内，对吗？

无论如何，除了问题之外，一个建议是在Java中，建议用第一个字母将班级命名为大写字母，因此意味着这种方式：

公共类可靠

而不是

公共类可靠

Answer 2

如果使用片段，而不是：

Intent setTable = new Intent(this, setTable.class);

使用：

Intent setTable = new Intent(getActivity, setTable.class);