如何在android中显示闪烁文本。
谢谢你们。
实际上,在 ICS 中有一个复活节彩蛋闪烁标签!:) 我实际上并不推荐使用它——不过,在源代码中找到它真的很有趣!
<blink xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I'm blinking"
/>
</blink>
为它创建一个视图动画。您可以在 0 秒内从 100% 到 0% 进行 alpha 渐变,然后在一个循环中再次返回。这样一来,Android 就可以智能地处理它,您不必乱用线程和浪费 CPU。
更多关于动画的信息:http:
//developer.android.com/reference/android/view/animation/package-summary.html
教程: http:
//developerlife.com/tutorials/ ?p=343
在代码中使用线程总是会浪费 CPU 时间并降低应用程序的性能。你不应该一直使用线程。必要时使用。
为此目的使用 XML 动画:
动画眨眼
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha android:fromAlpha="0.0"
android:toAlpha="1.0"
android:interpolator="@android:anim/accelerate_interpolator"
android:duration="600"
android:repeatMode="reverse"
android:repeatCount="infinite"/>
</set>
闪烁活动:像这样使用它:-
public class BlinkActivity extends Activity implements AnimationListener {
TextView txtMessage;
Button btnStart;
// Animation
Animation animBlink;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_blink);
txtMessage = (TextView) findViewById(R.id.txtMessage);
btnStart = (Button) findViewById(R.id.btnStart);
// load the animation
animBlink = AnimationUtils.loadAnimation(getApplicationContext(),
R.anim.blink);
// set animation listener
animBlink.setAnimationListener(this);
// button click event
btnStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
txtMessage.setVisibility(View.VISIBLE);
// start the animation
txtMessage.startAnimation(animBlink);
}
});
}
@Override
public void onAnimationEnd(Animation animation) {
// Take any action after completing the animation
// check for blink animation
if (animation == animBlink) {
}
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationStart(Animation animation) {
}
}
如果您有任何疑问,请告诉我。
可以通过添加交替两个 TextView 的 ViewFlipper 来完成,并且可以在切换时应用 Fadein 和 Fadeout 动画。
布局文件:
<ViewFlipper android:id="@+id/flipper" android:layout_width="fill_parent" android:layout_height="wrap_content" android:flipInterval="1000" >
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:text="TEXT THAT WILL BLINK"/>
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:text="" />
</ViewFlipper>
活动代码:
private ViewFlipper mFlipper;
mFlipper = ((ViewFlipper)findViewById(R.id.flipper));
mFlipper.startFlipping();
mFlipper.setInAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_in));
mFlipper.setOutAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_out));
If you want to make text blink on canvas in bitmap image so you can use this code
we have to create two methods
So first, let's declare a blink duration and a holder for our last update time:
private static final int BLINK_DURATION = 350; // 350 ms
private long lastUpdateTime = 0; private long blinkStart=0;
现在创建方法
public void render(Canvas canvas) {
Paint paint = new Paint();
paint.setTextSize(40);
paint.setColor(Color.RED);
canvas.drawBitmap(back, width / 2 - back.getWidth() / 2, height / 2
- back.getHeight() / 2, null);
if (blink)
canvas.drawText(blinkText, width / 2, height / 2, paint);
}
现在创建更新方法来闪烁
public void update() {
if (System.currentTimeMillis() - lastUpdateTime >= BLINK_DURATION
&& !blink) {
blink = true;
blinkStart = System.currentTimeMillis();
}
if (System.currentTimeMillis() - blinkStart >= 150 && blink) {
blink = false;
lastUpdateTime = System.currentTimeMillis();
}
}
现在它工作正常
public static void blinkText(TextView textView) {
Animation animation = new AlphaAnimation(1, 0); // Change alpha from fully visible to invisible
animation.setDuration(300); // duration - half a second
animation.setInterpolator(new LinearInterpolator()); // do not alter animation rate
animation.setRepeatCount(-1); // Repeat animation infinitely
animation.setRepeatMode(Animation.REVERSE); // Reverse animation at the end so the button will fade back in
textView.startAnimation(animation);
}
我不记得我在哪里找到的,但这是迄今为止我见过的最好的
private bool _blink;
private string _initialtext;
private async void Blink()
{
_initialtext = _txtView.Text;
_txtView.Text = Resources.GetString(Resource.String.Speak_now);
while (VoiceRecognizerActive)
{
await Task.Delay(200);
_blink = !_blink;
Activity.RunOnUiThread(() =>
{
if (_blink)
_txtView.Visibility = ViewStates.Invisible;
else
_txtView.Visibility = ViewStates.Visible;
});
}
_txtView.Text = _initialtext;
_txtView.Visibility = ViewStates.Visible;
}
//这是Xamarin android