4

我一直试图在我的应用程序中为单词 HELLO 提供选取框效果，但除非文本长度超过屏幕大小，否则 android 不允许这样做。有解决方案吗？

PS：看起来很简单，我还没有找到任何解决方案。

4

6 回答 6

11

我使用了我在早期 Android 时代开发的简单的轻量级自动收报机动画。

下面是完整的代码。

希望这可以帮助。

适用于 Android 的所有 API 级别

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.view.Menu;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setticker("Hello", this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


    public  void setticker(String text, Context contx) {
        if (text != "") {
            LinearLayout parent_layout = (LinearLayout) ((Activity) contx)
                    .findViewById(R.id.ticker_area);

            TextView view = new TextView(contx);
            view.setText(text);

            view.setTextColor(Color.BLACK);
            view.setTextSize(25.0F);
            Context context = view.getContext(); // gets the context of the view

            // measures the unconstrained size of the view
            // before it is drawn in the layout
            view.measure(View.MeasureSpec.UNSPECIFIED,
                    View.MeasureSpec.UNSPECIFIED);

            // takes the unconstrained width of the view
            float width = view.getMeasuredWidth();
            float height = view.getMeasuredHeight();

            // gets the screen width
            float screenWidth = ((Activity) context).getWindowManager()
                    .getDefaultDisplay().getWidth();

            view.setLayoutParams(new LinearLayout.LayoutParams((int) width,
                    (int) height, 1f));

            System.out.println("width and screenwidth are" + width + "/"
                    + screenWidth + "///" + view.getMeasuredWidth());

            // performs the calculation
            float toXDelta = width - (screenWidth - 0);

            // sets toXDelta to -300 if the text width is smaller that the
            // screen size
            if (toXDelta < 0) {
                toXDelta = 0 - screenWidth;// -300;
            } else {
                toXDelta = 0 - screenWidth - toXDelta;// -300 - toXDelta;
            }
            // Animation parameters
            Animation mAnimation = new TranslateAnimation(screenWidth,
                    toXDelta, 0, 0);
            mAnimation.setDuration(15000);
            mAnimation.setRepeatMode(Animation.RESTART);
            mAnimation.setRepeatCount(Animation.INFINITE);
            view.setAnimation(mAnimation);
            parent_layout.addView(view);
        }
    }


}

在activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/ticker_area"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#9CB1DD"
        android:orientation="horizontal" >
    </LinearLayout>
</RelativeLayout>
于 2013-05-04T06:31:28.870 回答
4

有一个简单的解决方案

您必须像下面的代码一样创建WebView并显示选取框。

webView = (WebView)findViewById(R.id.web);

String summary = "<html><FONT color='#fdb728' FACE='courier'><marquee behavior='scroll' direction='left' scrollamount=10>"
                + "Hello Droid" + "</marquee></FONT></html>";

webView.loadData(summary, "text/html", "utf-8");
于 2013-05-04T06:31:14.770 回答
1

尝试使用 Git Hub 中的Tickerview。

于 2013-05-04T06:15:43.597 回答
0

这是您问题的完整代码：

Main_Activity.java 代码：'

 WebView webView;

webView = (WebView)findViewById(R.id.web);


String summary = "<html><FONT color='#fdb728' FACE='courier'><marquee behavior='scroll' direction='left' scrollamount=10>"
        + "Hello Droid" + "</marquee></FONT></html>"; 

webView.loadData(summary, "text/html", "utf-8"); // Set focus to the textview'

main_activity.xml 代码：

<WebView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/web"
        ></WebView>

于 2015-06-25T12:13:13.843 回答
0

为了在文本视图上应用 tickr/marquee 动画（即使是短文本长度），它会创建一个从极右 (+1f) 到极左 (-1f) 的平移动画，然后重新启动动画。

public void setTickerAnimation(View view) {
    Animation animation = new TranslateAnimation(
            Animation.RELATIVE_TO_SELF, +1f,
            Animation.RELATIVE_TO_SELF, -1f,
            Animation.RELATIVE_TO_SELF, 0f,
            Animation.RELATIVE_TO_SELF, 0f);
    animation.setRepeatCount(Animation.INFINITE);
    animation.setRepeatMode(Animation.RESTART);
    animation.setInterpolator(new LinearInterpolator());
    animation.setDuration(4000);
    view.startAnimation(animation);
}
于 2017-11-06T07:01:25.517 回答
0

我发现的捷径是调用这个方法并传递TextView给它。

    fun addMarquee(textView: TextView) {
    textView.viewTreeObserver.addOnGlobalLayoutListener(object :
        ViewTreeObserver.OnGlobalLayoutListener {
        override fun onGlobalLayout() {
            val pixels = textView.measuredWidth - 1
            val params = textView.layoutParams
            params.width = pixels
            textView.layoutParams = params
            textView.isSelected = true
            textView.ellipsize = TextUtils.TruncateAt.MARQUEE
            textView.isSingleLine = true
            textView.marqueeRepeatLimit = -1
            textView.viewTreeObserver.removeOnGlobalLayoutListener(this)
        }
    })
}

注意：此方法仅在 textView 宽度为wrap_content.

于 2021-04-09T15:47:28.310 回答