小贝子编程

TextView中的自动水平滚动



我有自定义图库。库表示框架布局的项目。上面有一个imageView和textView。

如果textView中的文本太长，我需要自动滚动它。这是一行文本，需要水平滚动。

我发现了以下代码片段：

TextView
    android:text="Single-line text view that scrolls automatically"       
    android:singleLine="true" 
    android:ellipsize="marquee"
    android:marqueeRepeatLimit ="marquee_forever"
    android:focusable="true"
    android:focusableInTouchMode="true" 
    android:scrollHorizontally="true"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"/>

它在我的测试应用程序中工作，其中只有一个文本视图。但它在我的画廊里不起作用。注意到发生了什么，文本只是保持静止。

有什么帮助吗？

试试这个自定义的TextView类：

public class AutoScrollingTextView extends TextView {
    public AutoScrollingTextView(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }
    public AutoScrollingTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public AutoScrollingTextView(Context context) {
        super(context);
    }
    @Override
    protected void onFocusChanged(boolean focused, int direction,
            Rect previouslyFocusedRect) {
        if (focused) {
            super.onFocusChanged(focused, direction, previouslyFocusedRect);
        }
    }
    @Override
    public void onWindowFocusChanged(boolean focused) {
        if (focused) {
            super.onWindowFocusChanged(focused);
        }
    }
    @Override
    public boolean isFocused() {
        return true;
    }
}

并设置以下XML属性：

android:scrollHorizontally="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"

这在我的词典应用程序中效果很好，其中多个条目可能需要同时自动滚动才能显示完整的内容。

TextView上的字幕效果仅设计用于聚焦或选择视图时。您所拥有的XML代码一直试图使TextView成为焦点。不幸的是，由于任何时候只能聚焦一个视图，并且库中有多个视图，因此这种方法不适用。

否则，实现这一点的最简单方法是始终选择TextViews。多个TextViews可以同时保持所选状态。选择用于AdapterView的活动元素，但在AdapterView之外仍然有效。首先，从XML中删除修改焦点的属性，然后在视图初始化后的某个时间调用TextView.setSelected(true)，例如在Activity.onCreate(Bundle)中（没有XML属性）。如果从适配器提供视图，则可以在展开视图后的getView()方法期间调用TextView.setSelected(true)。

下面是一个示例项目，展示了为多个TextViews工作的字幕，以及Gallery中的行为。

尝试使用ViewPager而不是库。这在android支持包中提供。http://android-developers.blogspot.in/2011/08/horizontal-view-swiping-with-viewpager.html

我尝试了所有的方法，终于想出了这个。这对我很有用…希望有一天能对你有所帮助。干杯

 package com.gui.custom_views;
 import android.content.Context;
 import android.graphics.Paint;
 import android.graphics.Typeface;
 import android.text.TextUtils; 
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.Animation;
 import android.view.animation.LinearInterpolator;
 import android.view.animation.TranslateAnimation;
 import android.widget.LinearLayout;
 import android.widget.ScrollView;
 import android.widget.TextView;
 import com.media_player.AndroidMediaPlayerActivity;
 /**
 * Custom Automatic Scrollable Text View
 * 
 * @author Veljko Ilkic
 * 
 */
 public class AutomaticScrollTextView extends LinearLayout {
// Context of application
Context context;
// TextView
private TextView mTextField1;
// Horizontal scroll
private ScrollView mScrollView1;
// Animation on start
private Animation mMoveTextOnStart = null;
// Out animation
private Animation mMoveText1TextOut = null;
// Duration of animation on start
private int durationStart;
// Duration of animation
private int duration;
// Pain for drawing text
private Paint mPaint;
// Text current width
private float mText1TextWidth;
/**
 * Control the speed. The lower this value, the faster it will scroll.
 */
public static final int MS_PER_PX = 80;
/**
 * Control the pause between the animations. Also, after starting this
 * activity.
 */
public static final int PAUSE_BETWEEN_ANIMATIONS = 0;
private boolean mCancelled = false;
// Layout width
private int mWidth;
// Animation thread
private Runnable mAnimation1StartRunnable;
public AutomaticScrollTextView(Context context) {
    super(context);
    init(context);
    this.context = context;
}
public AutomaticScrollTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(context);
    this.context = context;
}
private void init(Context context) {
    initView(context);
    // init helper
    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setStrokeWidth(1);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
    super.onLayout(changed, l, t, r, b);
    mWidth = getMeasuredWidth();
    // Calculate
    prepare();
    // Setup
    setupText1Marquee();
}
@Override
public void setOnClickListener(OnClickListener l) {
    super.setOnClickListener(l);
    mTextField1.setOnClickListener(l);
}
// Method to finally start the marquee.
public void startMarquee() {
    prepare();
    prepareTextFields();
    startTextField1Animation();
    mCancelled = false;
}
private void startTextField1Animation() {
    mAnimation1StartRunnable = new Runnable() {
        public void run() {
            mTextField1.setVisibility(View.VISIBLE);
            mTextField1.startAnimation(mMoveTextOnStart);
        }
    };
    postDelayed(mAnimation1StartRunnable, PAUSE_BETWEEN_ANIMATIONS);
}
public void reset() {
    mCancelled = true;
    if (mAnimation1StartRunnable != null) {
        removeCallbacks(mAnimation1StartRunnable);
    }
    mTextField1.clearAnimation();
    prepareTextFields();
    mMoveTextOnStart.reset();
    mMoveText1TextOut.reset();
    mScrollView1.removeView(mTextField1);
    mScrollView1.addView(mTextField1);
    mTextField1.setEllipsize(TextUtils.TruncateAt.END);
    invalidate();
}
public void prepareTextFields() {
    mTextField1.setEllipsize(TextUtils.TruncateAt.END);
    mTextField1.setVisibility(View.INVISIBLE);
    expandTextView(mTextField1);
}
private void setupText1Marquee() {
    // Calculate duration of animations
    durationStart = (int) ((mWidth + mText1TextWidth) * MS_PER_PX);
    duration = (int) (2 * mWidth * MS_PER_PX);
    // On start animation
    mMoveTextOnStart = new TranslateAnimation(0, -mWidth - mText1TextWidth,
            0, 0);
    mMoveTextOnStart.setDuration(durationStart);
    mMoveTextOnStart.setInterpolator(new LinearInterpolator());
    mMoveTextOnStart.setFillAfter(true);
    // Main scrolling animation
    mMoveText1TextOut = new TranslateAnimation(mWidth, -mWidth
            - mText1TextWidth, 0, 0);
    mMoveText1TextOut.setDuration(duration);
    mMoveText1TextOut.setInterpolator(new LinearInterpolator());
    mMoveText1TextOut.setFillAfter(true);
    mMoveText1TextOut.setRepeatCount(Animation.INFINITE);
    // Animation listeners
    mMoveTextOnStart
            .setAnimationListener(new Animation.AnimationListener() {
                public void onAnimationStart(Animation animation) {
                    invalidate();
                    mTextField1.invalidate();
                }
                public void onAnimationEnd(Animation animation) {
                    if (mCancelled) {
                        return;
                    }
                    mTextField1.startAnimation(mMoveText1TextOut);
                }
                public void onAnimationRepeat(Animation animation) {
                    invalidate();
                    mTextField1.invalidate();
                }
            });
    mMoveText1TextOut
            .setAnimationListener(new Animation.AnimationListener() {
                public void onAnimationStart(Animation animation) {
                    invalidate();
                    mTextField1.invalidate();
                }
                public void onAnimationEnd(Animation animation) {
                    if (mCancelled) {
                        return;
                    }
                }
                public void onAnimationRepeat(Animation animation) {
                    invalidate();
                    mTextField1.invalidate();
                }
            });
}
private void prepare() {
    // Measure
    mPaint.setTextSize(mTextField1.getTextSize());
    mPaint.setTypeface(mTextField1.getTypeface());
    mText1TextWidth = mPaint.measureText(mTextField1.getText().toString());
    setupText1Marquee();
}
private void initView(Context context) {
    setOrientation(LinearLayout.VERTICAL);
    setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.FILL_PARENT, Gravity.LEFT));
    setPadding(0, 0, 0, 0);
    // Scroll View 1
    LayoutParams sv1lp = new LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT);
    sv1lp.gravity = Gravity.CENTER_HORIZONTAL;
    mScrollView1 = new ScrollView(context);
    // Scroll View 1 - Text Field
    mTextField1 = new TextView(context);
    mTextField1.setSingleLine(true);
    mTextField1.setEllipsize(TextUtils.TruncateAt.END);
    mTextField1.setTypeface(null, Typeface.BOLD);
    mScrollView1.addView(mTextField1, new ScrollView.LayoutParams(
            mTextField1.getWidth(), LayoutParams.WRAP_CONTENT));
    addView(mScrollView1, sv1lp);
}
public void setText1(String text) {
    String temp = "";
    if (text.length() < 10) {
        temp = "         " + text + "         ";
    } else {
        temp = text;
    }
    mTextField1.setText(temp);
}
public void setTextSize1(int textSize) {
    mTextField1.setTextSize(textSize);
}
public void setTextColor1(int textColor) {
    mTextField1.setTextColor(textColor);
}
private void expandTextView(TextView textView) {
    ViewGroup.LayoutParams lp = textView.getLayoutParams();
    lp.width = AndroidMediaPlayerActivity.getScreenWidth();
    textView.setLayoutParams(lp);
}
}

我曾经遇到过这个问题，并通过在textView上调用.setFocus（）最终解决了这个问题。

Hi您在xml文件中有Tag。并在java文件中使用FOCUS_DOWN的Scrollview属性。。。希望它能帮助你。。。

这段代码对我来说工作正常。

scrollview=（scrollview）findViewById（R.id.scrollview1）；tb2.setTextSize（30）；

    tb2.setMovementMethod(new ScrollingMovementMethod());
    scrollview.post(new Runnable() { 
    public void run() { 
        scrollview.fullScroll(View.FOCUS_DOWN);  
        }
    });

public class ScrollingTextView extends TextView {
    public ScrollingTextView(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }
    public ScrollingTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public ScrollingTextView(Context context) {
        super(context);
    }
    @Override
    protected void onFocusChanged(boolean focused, int direction,
            Rect previouslyFocusedRect) {
        if (focused) {
            super.onFocusChanged(focused, direction, previouslyFocusedRect);
        }
    }
    @Override
    public void onWindowFocusChanged(boolean focused) {
        if (focused) {
            super.onWindowFocusChanged(focused);
        }
    }
    @Override
    public boolean isFocused() {
        return true;
    }
}
 <com.test.autoscroll.ScrollingTextView
                android:id="@+id/actionbar_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingLeft="10dip"
                android:paddingRight="10dip"
                android:textSize="16dip"
                android:textStyle="bold"
                android:lines="1"
                android:scrollHorizontally="true"
                android:ellipsize="marquee"
                 android:text="autoscrollable textview without focus to textview...working...."
                android:marqueeRepeatLimit="marquee_forever"
                />

将此代码添加到您自己的中

findViewById(R.id.yourtextviewid).setSelected(true);

也许你的问题已经解决了。

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