Question

我在这里有一个新问题。我在片段中有卡片布局。其中一张卡片上有一个按钮，我打开一个新活动。

if("activity1".equals(button.getTag())){

                        Intent intent1 = new Intent(itemView.getContext(), MainActivity2.class);
                        itemView.getContext().startActivity(intent1);

                    }

我的MainActivity2.java

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        pDialog = new ProgressDialog(this);
        images = new ArrayList<>();
        mAdapter = new GalleryAdapter(getApplicationContext(), images);

        RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getApplicationContext(), 2);
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(mAdapter);

MainActivity2从服务器加载图像。当我单击按钮并打开MainActivity2.java时，我想要提示消息“请等待我们为您加载内容”。我尝试了下面的内容：

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
     Toast.makeText(this, this.getIntent().getExtras().getString("value"),Toast.LENGTH_LONG).show();

但它不起作用。我该如何解决这个问题？

Answer 1

什么是额外的“价值”？它来自哪里？

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    Toast.makeText(this, "Please wait while we load things for you", Toast.LENGTH_LONG).show();
}

Answer 2

试试这个：

<强> MainActivity2.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    Toast.makeText(getApplicationContext(), "Please wait while we load things for you",Toast.LENGTH_LONG).show();
}

如何使用Toast？见Documentation

从卡片视图开始活动后烘烤消息

2 个答案: