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如何在Android上的现有XML布局中包含自定义视图?

[英]How can I include a custom view in an existing XML layout on Android?

我已按照本教程( http://stuffthathappens.com/blog/2008/11/13/android-animation-101/ )进行操作,并在画布上绘制了漂亮的旋转文字。 当我的主要活动使用时,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,所以我有一个RelativeLayout:

<?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>

如何将此自定义视图添加到上面的LinearLayout中? (topLinearLayout-这是最后一个)

我尝试了很多不同的方法,但最终还是以强制关闭告终。

这种方法主要是我尝试过的方法。 我试过充气,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))

有用!!

为什么其他手动添加方法不起作用? 这与动画需要通过onDraw开始有关吗?

您应该能够像在布局中的任何其他视图一样包含它。

请尝试以下操作,然后将内容视图设置为整个XML布局:

<LinearLayout android:id="@+id/topLinearLayout"
  android:orientation="vertical" android:layout_height="wrap_content"
  android:layout_alignParentTop="true" android:layout_width="fill_parent">
      <com.YOURPACKAGENAME.SplashScreenAnimation
           android:id="@+id/animation"
           android:layout_height="wrap_content"
           android:layout_width="wrap_content"/>
 </LinearLayout>

这很容易,您只需要包含扩展View类的类的完整程序包名称即可:

<LinearLayout
    android:id="@+id/topLinearLayout"
    android:orientation="vertical"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_width="fill_parent">

       <mypackage.SplashScreenAnimation
           android:layout_height="wrap_content"
           android:layout_width="fill_parent"/>

</LinearLayout>

尝试以下行添加视图:

((LinearLayout) findViewById(R.id.topLinearLayout)).addView(new SplashScreenAnimation(this))

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