Question

我在textview中显示的文本在一段时间后会发生变化。我想在循环中执行此操作，即文本恢复为原始文本然后再次更改。这是代码。

MainActivity.java

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Answer 1

试试这个。

qoutes=(TextView)rootView.findViewById(R.id.textView_q);
int i = 0;

Handler handler = new Handler();
handler.postDelayed(new Runnable(){ 


    @Override
    public void run() {
        // TODO Auto-generated method stub
        if(i%2==0){
          qoutes.setText("I don’t trust words. I trust pictures. – Gilles Peress ");
        }else{
          qoutes.setText("You don’t take a photograph. You ask quietly to borrow it. – Unknown  ");
        }
        i++;
    }
}, 10000);

修改

Timer timer; TimerTask timertask; int i = 0; qoutes=(TextView)rootView.findViewById(R.id.textView_q); timer = new Timer(); timertask = new TimerTask() { @Override public void run() { runOnUiThread(new Runnable() { @Override public void run() { if(i%2==0){ qoutes.setText("I don’t trust words. I trust pictures. – Gilles Peress "); }else{ qoutes.setText("You don’t take a photograph. You ask quietly to borrow it. – Unknown "); } i++; } }); } }; timer.scheduleAtFixedRate(timertask, 100, 10000);

Answer 2

首先，创建String资源和成员变量以跟踪显示的当前文本。最好存储在strings.xml中，但是对于这个简单的例子，我们只使用String数组。还要将Handler创建为成员变量。

nltk.word_tokenize

然后，在onCreateView（）中：

    TextView qoutes;
    Handler handler = new Handler();
    int currentTextPosition = -1;
    String[] textArray = new String[]{"I don’t trust words. I trust pictures. – Gilles Peress ",
            "You don’t take a photograph. You ask quietly to borrow it. – Unknown  "};

并且，Runnable的定义：

    qoutes=(TextView)rootView.findViewById(R.id.textView_q);
    handler.postDelayed(setTextRunnable, 10000);

这将每隔10秒运行一次，直到你停止它，你可以通过调用：

来完成

Runnable setTextRunnable = new Runnable(){ 
    @Override
    public void run() {
        if (currentTextPosition < 0 ) {
         currentTextPosition = 0;   
        } else {
            currentTextPosition++;
            if (currentTextPosition >= textArray.length) {
                currentTextPosition = 0;
            }
        }
        qoutes.setText(textArray[currentTextPosition]);
        handler.postDelayed(this, 10000);
    }
};

在文本视图中更改文本

2 个答案: