Android字体横向滚动条目

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原理自定义textview

源码：http://download.csdn.net/detail/lm_zp/9517135

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"    tools:context=".MainActivity" >    <com.bwie.androidtest.AutoText           android:id="@+id/autoTxt"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:background="#ffffff"            android:textColor="#00ff00"            android:textSize="35sp" />  </RelativeLayout>

自定义textview

AutoText

package com.bwie.androidtest;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.graphics.Typeface;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.view.WindowManager;import android.widget.TextView;public class AutoText extends TextView {private int width, height;private Paint paintText;private float posx, posy;private float speed = 0.0f;private String text = "hello haha";private float textWidth = 0;private float moveDistance = 0.0f;private boolean isStarting = false;public AutoText(Context context) {super(context);}public AutoText(Context context, AttributeSet attrs) {super(context, attrs);}private void initView() {paintText = new Paint();//字体大小paintText.setTextSize(50.0f);//字体颜色paintText.setColor(Color.BLACK);paintText.setTypeface(Typeface.DEFAULT_BOLD);paintText.setAntiAlias(true);text = getText().toString();textWidth = paintText.measureText(text);Log.e("msg", "textWidth= " + textWidth);this.speed = textWidth;moveDistance = textWidth * 2 + width;}public void initDisplayMetrics(WindowManager windowManager) {/* 取得屏幕分辨率大小 */DisplayMetrics dm = new DisplayMetrics();windowManager.getDefaultDisplay().getMetrics(dm);this.width = dm.widthPixels;this.height = dm.heightPixels;initView();this.posx = width + textWidth;FontMetrics fm = paintText.getFontMetrics();float baseline = fm.descent - fm.ascent;//字体显示高度this.posy = height / 2 - baseline;}public void startScroll() {isStarting = true;invalidate();}public void stopScroll() {isStarting = false;invalidate();}@Overrideprotected void onDraw(Canvas canvas) {// super.onDraw(canvas);canvas.drawText(text, posx - speed, posy, paintText);if (!isStarting) {return;}speed += 2.0f;if (speed > moveDistance)speed = textWidth;invalidate();}}

MainActivity

package com.bwie.androidtest;import android.os.Bundle;import android.app.Activity;import android.text.TextUtils.TruncateAt;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {String str11 = "促进青年教师全面发展，\n引导广大高校青年教师为实现中华民族伟大复兴的中国梦贡献力" + "\n"+ "促进青年教师全面发展，\n引导广大高校青年教师为实现中华民族伟大复兴的中国梦贡献力" + "\n"+ "  djsdnh   kshdfjks     \n\r\t ";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);scroll3();}void scroll3() {AutoText auto = (AutoText) findViewById(R.id.autoTxt);auto.setText(str11);//传递屏幕宽度auto.initDisplayMetrics(getWindowManager());//开始auto.startScroll();}}

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