Android(安卓)滚动字幕实现

最近项目需求做个循环滚动字幕功能，自己找了相关资料，根据自己的风格用两种方法实现了该功能；

(备注：本人只实现了滚动效果，对于文字的格式排版没做处理，格式可能会乱，文字排版还在研究中)

效果图：

具体如下；

方法一:横向滚动字幕继承TextView

package com.example.playpic;    import com.example.playpic.AutoScrollTextView.SavedState;    import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.graphics.Typeface;  import android.graphics.Paint.FontMetrics;  import android.os.Parcel;  import android.os.Parcelable;  import android.util.AttributeSet;  import android.util.DisplayMetrics;  import android.util.Log;  import android.view.WindowManager;  import android.view.View.BaseSavedState;  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();          paintText.setTextSize(50.0f);          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;           this.posy=height/2-baseline;       }            public void startScroll() {          isStarting = true;          invalidate();      }      public void stopScroll() {          isStarting = false;          invalidate();      }            @Override      protected 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();      }        }

布局文件；

<?xml version="1.0" encoding="utf-8"?>

方法二：继承sufaceView实现纵向文字滚动功能

package com.example.playpic;    import java.util.ArrayList;  import java.util.List;    import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.graphics.Paint.FontMetrics;  import android.graphics.Rect;  import android.graphics.Typeface;  import android.util.AttributeSet;  import android.util.DisplayMetrics;  import android.view.SurfaceHolder;  import android.view.SurfaceView;  import android.view.WindowManager;    public class ScrollText extends SurfaceView implements SurfaceHolder.Callback ,Runnable{        private int width,height;      private SurfaceHolder sfh;      private Thread th;      private boolean flag;      private Paint backPaint,textPaint;      /**文字开始出现的位置坐标*/      private float posx,posy;      /**每行文本 当前移动文本距离以及文本的原始移动位置*/      private Float[] step,stepBack;      private String txtContent;      /**存储每行文本原始纵坐标位置*/      private Float[] tposy;      /**存储每行文本内容*/      private String[] texts;            public ScrollText(Context context) {          super(context);          initView();      }            public ScrollText(Context context, AttributeSet attrs) {          super(context, attrs);          initView();      }        private void initView(){          sfh=this.getHolder();          sfh.addCallback(this);            this.setKeepScreenOn(true);          this.setFocusable(true);      //  this.setFocusableInTouchMode(true);          backPaint=new Paint();          backPaint.setColor(Color.BLACK);          textPaint=new Paint();                    textPaint.setTextSize(30.0f);          textPaint.setColor(Color.BLUE);          textPaint.setTypeface(Typeface.DEFAULT_BOLD);          textPaint.setTextAlign(Paint.Align.LEFT);          textPaint.setAntiAlias(true);      }            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;          this.posx=width/6;        /*  FontMetrics fm = textPaint.getFontMetrics();           float baseline = fm.descent - fm.ascent;*/          this.posy=height-100;                }            public void setTxtContent(String txt){          this.txtContent=txt;      }            @Override      public void surfaceCreated(SurfaceHolder holder) {          this.flag=true;                    if(th==null||!th.isAlive()){              th=new Thread(this);              th.start();          }      }            @Override      public void surfaceChanged(SurfaceHolder holder, int format, int width,              int height) {                }        @Override      public void surfaceDestroyed(SurfaceHolder holder) {                    this.flag=false;      }      /**      * 调用所有绘制方法      */      private void drawAll(){          Canvas canvas=null;          try{              canvas=sfh.lockCanvas();              drawText(canvas, txtContent);                        }catch(Exception e){              e.printStackTrace();          }finally{              if(canvas!=null){                  sfh.unlockCanvasAndPost(canvas);              }          }      }            private void drawText(Canvas canvas,String text){          //clear screen          canvas.drawRect(new Rect(0,0,getWidth(),getHeight()), backPaint);                    initDrawText(text);                        int len=tposy.length;          // draw text content          for(int n=0;n totalList=new ArrayList(10);          String[] str=text.split("\n");          int len=str.length;                    for(int i=0;iwidth){                         lineNum++;                 //      start=j;                         end=j;                         j--;                         w=0;                                                  lineTexts[n++] = (String) content.subSequence(start, end);                         start=end;                     }else{                         if(j==(lenStr-1)){                             lineNum++;                             lineTexts[n++] = (String) content.subSequence(start, end);                             break;                         }                     }                 }             }             Log.e("msg", "lineNum= "+lineNum);*/                             float textWidth = p.measureText(content);          if(textWidth <= width) {              return new String[]{content};          }                    int length = content.length();          int start = 0, end = 1, i = 0;          int lines = (int) Math.ceil(textWidth / width); //计算行数          String[] lineTexts = new String[lines];                    while(start < length) {              if(p.measureText(content, start, end) > width) { //文本宽度超出控件宽度时                      lineTexts[i++] = content.substring(start, end);//(String) content.subSequence(start, end);                      start = end;                  }              if(end == length) { //不足一行的文本                  lineTexts[i] = content.substring(start, end);//(String) content.subSequence(start, end);                  break;              }              end += 1;          }                        return lineTexts;      }            @Override      public void run() {          while(flag){              drawAll();              try {                  Thread.sleep(200);              } catch (InterruptedException e) {                  e.printStackTrace();              }          }      }          }

package com.example.playpic;    import java.io.BufferedReader;  import java.io.File;  import java.io.FileInputStream;  import java.io.FileNotFoundException;  import java.io.FileOutputStream;  import java.io.FileReader;  import java.io.IOException;  import java.io.InputStreamReader;    import android.app.Activity;  import android.os.Bundle;  import android.os.Environment;  import android.text.method.ScrollingMovementMethod;  import android.util.Log;  import android.widget.TextView;    import com.sample.fun.R;    public class ScrollTextActivity extends Activity{          String str="";        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 ";            @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);                scroll3();      }            void scroll2(){          ScrollText v=new ScrollText(getApplicationContext());          setContentView(v);          v.setTxtContent(str11);          v.initDisplayMetrics(getWindowManager());      }            void scroll3(){          setContentView(R.layout.scrollview1);          AutoText auto=(AutoText)findViewById(R.id.autoTxt);          auto.setText(str11);          auto.initDisplayMetrics(getWindowManager());          auto.startScroll();      }        }

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