android - getApplicationContext() 不适用于异步事件

Question

我想使用异步事件对输入到 texbox 中的文本进行 toast ，例如。按下按钮。它编译没有错误，但按下按钮时没有任何反应。从我在论坛上收集到的信息来看，我的背景是错误的。有人能帮我吗？下面是代码:

mSendButton = (Button)findViewById(R.id.button_send);
mSendButton.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        TextView view = (TextView)findViewById(R.id.edit_text_out);
        String message = view.getText().toString();
        if (message == "bla") {
            Toast.makeText(getApplicationContext(), "Bla was entered", Toast.LENGTH_LONG).show();
        }
        else {
            Toast.makeText(getApplicationContext(), "Bye ", Toast.LENGTH_SHORT).show();
        }
    }
});

Answer 1

试试这个:

mSendButton = (Button)findViewById(R.id.button_send);
mSendButton.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        TextView view = (TextView)findViewById(R.id.edit_text_out);
        String message = view.getText().toString();
        if (message == "bla") {
            Toast.makeText(getActivity(), "Bla was entered", Toast.LENGTH_LONG).show();
        }
        else {
            Toast.makeText(getActivity(), "Bye ", Toast.LENGTH_SHORT).show();
        }
    }
});

或:

mSendButton = (Button)findViewById(R.id.button_send);
mSendButton.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        TextView view = (TextView)findViewById(R.id.edit_text_out);
        String message = view.getText().toString();
        if (message == "bla") {
            Toast.makeText(getContext(), "Bla was entered", Toast.LENGTH_LONG).show();
        }
        else {
            Toast.makeText(getContext(), "Bye ", Toast.LENGTH_SHORT).show();
        }
    }
});