我遵循了本教程( http://stuffthathappens.com/blog/2008/11/13/android-animation-101/ ),并在 Canvas 上绘制了漂亮的旋转文本。当我的主要 Activity 使用时一切正常
setContentView(new SplashScreenAnimation(this));
这是 SplashScreenAnimation:
public class SplashScreenAnimation extends View {
private static final String QUOTE = "Nobody uses Java anymore. It's this big heavyweight ball and chain.";
private Animation anim;
public SplashScreenAnimation(Context context) {
super(context);
}
private void createAnim(Canvas canvas) {
anim = new RotateAnimation(0, 360, canvas.getWidth() / 2, canvas
.getHeight() / 2);
anim.setRepeatMode(Animation.REVERSE);
anim.setRepeatCount(Animation.INFINITE);
anim.setDuration(10000L);
anim.setInterpolator(new AccelerateDecelerateInterpolator());
startAnimation(anim);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// Creates the animation the first time
if (anim == null) {
createAnim(canvas);
}
Path circle = new Path();
int centerX = canvas.getWidth() / 2;
int centerY = canvas.getHeight() / 2;
int r = Math.min(centerX, centerY);
circle.addCircle(centerX, centerY, r, Direction.CW);
Paint paint = new Paint();
paint.setColor(Color.BLUE);
paint.setTextSize(30);
paint.setAntiAlias(true);
canvas.drawTextOnPath(QUOTE, circle, 0, 30, paint);
}
}
但是我想组合这个动画文本并在其下面有两个按钮,这样我就有一个相对布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/RelativeLayout1"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="@drawable/splash_screen">
<LinearLayout android:orientation="vertical"
android:layout_height="wrap_content" android:layout_width="fill_parent"
android:layout_alignParentBottom="true" android:id="@+id/bottomLinearLayout">
<Button android:layout_gravity="center_horizontal" android:id="@+id/playButton"
android:text="Button" android:layout_height="wrap_content"
android:layout_width="wrap_content"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="wrap_content" android:id="@+id/optionsButton"
android:text="Button" android:layout_gravity="center_horizontal"
android:layout_marginBottom="30sp"></Button>
</LinearLayout>
<LinearLayout android:id="@+id/topLinearLayout"
android:orientation="vertical" android:layout_height="wrap_content"
android:layout_alignParentTop="true" android:layout_width="fill_parent">
</LinearLayout>
</RelativeLayout>
如何将此自定义 View 添加到上面的 LinearLayout 中? (topLinearLayout - 这是最后一个)
我尝试了很多不同的方法,但总是以强制关闭告终。
我主要尝试过这种方法。我试过给它充气等等。
LinearLayout item = (LinearLayout)findViewById(R.id.topLinearLayout);
SplashScreenAnimation child = new SplashScreenAnimation(this);
item.addView(child);
我添加了整个 SplashScreenAnimation 类代码:
((LinearLayout) findViewById(R.id.topLinearLayout)).addView(new SplashScreenAnimation(this))
它有效!!
为什么其他手动添加方法不起作用?这与动画需要通过 onDraw
启动有关吗?
最佳答案
尝试使用此行添加 View :
((LinearLayout) findViewById(R.id.topLinearLayout)).addView(new SplashScreenAnimation(this))
关于java - 如何在 Android 上的现有 XML 布局中包含自定义 View ?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7472644/