我是Android应用程序开发的初学者。 我想创建一个卡拉OK风格的应用程序，不知何故，我可以在特定的时间间隔内更改图像。但是，我遇到了关于文本的问题，它不会随着歌曲的播放时间而改变。 我只是使用textview，但我想实现TextSwitcher，但我真的不知道如何。我知道如何使用ViewFlipper，但viewflipper仅用于静态间隔。 （我认为？） 请帮我显示文本，并在相应的时间内更改？谢谢。 还可以在不使用数组的情况下使用TextSwitcher吗？我需要展示的文字太多了，我想不到。
这是我到目前为止所拥有的：
public class LetItGo extends Activity
{
private ViewFlipper myviewflipper;
TextView t; private String sText;
private Handler mHandler = new Handler();
private Runnable mWaitRunnable = new Runnable() {
public void run() {
t.setText(sText);
}
};
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sample);
myviewflipper = (ViewFlipper) findViewById(R.id.flipper1);
myviewflipper.setAutoStart(true);
myviewflipper.setFlipInterval(5000);
myviewflipper.startFlipping();
t=(TextView)findViewById(R.id.textView1);
sText = ("Let It Go / Let Her Go Mash Up" + "\n by Sam Tsui");
t.setText(sText);
//1
sText = ("Let it go, let it go");
mHandler.postDelayed(mWaitRunnable, 1000*10);
//2
sText = ("You only need the light when its burning low");
mHandler.postDelayed(mWaitRunnable, 6000*10*10);
//3
sText = ("Let it go, let it go");
mHandler.postDelayed(mWaitRunnable, 9000*10);
//4
sText = ("You only miss the sun when it starts to snow");
mHandler.postDelayed(mWaitRunnable, 13000*10);
//5
sText = ("And here I stand, \n and here I'll stay");
mHandler.postDelayed(mWaitRunnable, 17000*10);
//6
sText = ("You only know you love her when you let her go");
mHandler.postDelayed(mWaitRunnable, 19000*10);
//7
sText = "The cold never bothered me anyway";
mHandler.postDelayed(mWaitRunnable, 25000*10);
//8
sText = ("Staring at the bottom of your glass");
mHandler.postDelayed(mWaitRunnable, 34000*10);
//9
sText = ("Hoping one day you'll make a dream last ");
mHandler.postDelayed(mWaitRunnable, 37000*10);
//10
sText = ("But dreams come slow");
mHandler.postDelayed(mWaitRunnable, 4000*100);
//11
sText = ("and they go so fast");
mHandler.postDelayed(mWaitRunnable, 42000*10);
//12
sText = ("You see her when you close your eyes ");
mHandler.postDelayed(mWaitRunnable, 47000*10);
//13
sText = ("Maybe one day you'll understand why");
mHandler.postDelayed(mWaitRunnable, 5000*100);
//14
sText = "Everything you touch surely dies";
mHandler.postDelayed(mWaitRunnable, 54000*10);
//15
sText = ("Don’t let them in, don’t let them see ");
mHandler.postDelayed(mWaitRunnable, 62000*10);
//16
sText = ("Be the good guy you always have to be ");
mHandler.postDelayed(mWaitRunnable, 65000*10);
//17
sText = ("Conceal, don’t feel, don’t let them know ");
mHandler.postDelayed(mWaitRunnable, 69000*10);
//18
sText = ("Well, now they know");
mHandler.postDelayed(mWaitRunnable, 75000*10);
//19
sText = ("Let it go, let it go");
mHandler.postDelayed(mWaitRunnable, 78000*10);
//20
sText = ("You only need the light when its burning low");
mHandler.postDelayed(mWaitRunnable, 81000*10);
//21
sText = ("Let it go, let it go");
mHandler.postDelayed(mWaitRunnable, 85000*10);
//22
sText = ("You only miss the sun when it starts to snow");
mHandler.postDelayed(mWaitRunnable, 88000*10);
//23
sText = ("And here I stand, \n and here I'll stay");
mHandler.postDelayed(mWaitRunnable, 92000*10);
//24
sText = ("You only know you love her when you let her go");
mHandler.postDelayed(mWaitRunnable, 98000*10);
//25
sText = ("The cold never bothered me anyway");
mHandler.postDelayed(mWaitRunnable, 104000*10);
//26
sText = ("Let it go,");
mHandler.postDelayed(mWaitRunnable, 112000*10);
//27
sText = ("let her go");
mHandler.postDelayed(mWaitRunnable, 116000*10);
//28
sText = ("You only need the light when it's burning low");
mHandler.postDelayed(mWaitRunnable, 121000*10);
//29
sText = ("You only miss the sun when it starts to snow");
mHandler.postDelayed(mWaitRunnable, 124000*10);
//30
sText = ("You only know you love her when you let her go");
mHandler.postDelayed(mWaitRunnable, 127000*10);
//31
sText = ("You only know you've been high when you're feeling low");
mHandler.postDelayed(mWaitRunnable, 134000*10);
//32
sText = ("You only hate the road when you’re missin' home");
mHandler.postDelayed(mWaitRunnable, 138000*10);
//33
sText = ("You only know you love her when you let her go");
mHandler.postDelayed(mWaitRunnable, 141000*10);
//34
sText = ("And now you know ooooooh");
mHandler.postDelayed(mWaitRunnable, 146000*10);
//35
sText = ("Let it go, let it go");
mHandler.postDelayed(mWaitRunnable, 152000*10);
//36
sText = ("You only need the light when its burning low");
mHandler.postDelayed(mWaitRunnable, 155000*10);
//37
sText = ("Let it go, let it go");
mHandler.postDelayed(mWaitRunnable, 158000*10);
//38
sText = ("You only miss the sun when it starts to snow");
mHandler.postDelayed(mWaitRunnable, 162000*10);
//39
sText = ("And here I stand,");
mHandler.postDelayed(mWaitRunnable, 166000*10);
//40
sText = ("and here I'll stay");
mHandler.postDelayed(mWaitRunnable, 169000*10);
//41
sText = ("You only know you love her when you let her go" + " \n oooooohhhhh...");
mHandler.postDelayed(mWaitRunnable, 172000*10);
//42
sText = ("dudududu... ");
mHandler.postDelayed(mWaitRunnable, 181000*10);
//43
sText = ("The cold never bothered me anyway");
mHandler.postDelayed(mWaitRunnable, 192000*10);
//44
sText = ("Let It Go / Let Her Go Mash Up" + "\n by Sam Tsui");
mHandler.postDelayed(mWaitRunnable, 197000*10);
}
}
我不知道我是否正确地做到了这一点。我根据我的研究把事情放在一起。 在此代码中，显示了最后一个sText，它没有更改。我不知道该怎么办了。 谢谢你的帮忙。 ：）
答案 0 :(得分：0)
当Handler稍后运行时，它会使用可用的sText的当前和最新内容。 你的所有处理程序都运行得很好，但是他们都看到了sText =的内容（“让它去/让她去混搭”+“Sam Tsui的”\ n“），这是最后一个sText =（”sometext“）调用; （第44次） 因为sText =（“something”）命令都是在应用程序运行时的第一个时刻执行的。
那该怎么办？
删除所有
sText = ("Some Text");
除了第一首歌（歌曲的标题）。
重写你的mWaitRunnable：
为您要打印的行数声明一个整数：
int lineNumber = 1;
private Runnable mWaitRunnable = new Runnable() {
public void run() {
switch (lineNumber) {
case 1:
sText = ("Let it go, let it go");
break;
case 2:
sText = ("You only need the light when its burning low");
break;
case 3:
sText = ("Let it go, let it go");
break;
case 4:
sText = ("You only miss the sun when it starts to snow");
break;
// continue up to case 44:
default:
break;
}
t.setText(sText);
lineNumber++;
}
};
享受：）