TextView 中的自动水平滚动 [英] Automatic horizontal scroll in TextView

问题描述

我有自定义画廊.Gallery 代表框架布局的项目.上面有一个 imageView 和 textView.

I have custom gallery. Gallery represents items that are frame layout. There are one imageView and textView above it.

如果 textView 中的文本太长，我需要它自动滚动.一行文字，需要水平滚动.

If text in textView is too long, i need it to be scrolled automatically. It's one line of text, and it's needed to be scrolled horizontally.

我找到了这段代码:

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"/>   

它适用于我的测试应用程序，其中只有一个文本视图.但它在我的画廊中不起作用.注意发生，文本保持静止.

It works in my test app with only one text view in it. But it doesn't work in my gallery. Noting happens, text just stay still.

有什么帮助吗?

推荐答案

我什么都试过了，终于想出了这个.这对我有用......希望有一天这会帮助你.干杯.

I've tried everything, and finally came up with this. This works for me...hope that this will help you someday. Cheers.

 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);
}
}

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