1、对话框的使用方法 2、自定义对话框的方法 3、在对话框当中显示候选的数字 MyView.java文件：package com.example.shudu03;import android.app.AlertDialog;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.widget.TextView;public class MyView extends View {    public MyView(Context context) {        super(context);    }    private float width;    private float height;    private Game game=new Game();        @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        this.width=w/9f;        this.height=h/9f;        super.onSizeChanged(w, h, oldw, oldh);    }        @Override    protected void onDraw(Canvas canvas) {        //画背景        Paint paintBackgroud=new Paint();        paintBackgroud.setColor(getResources().getColor(R.color.backgroundColor));        canvas.drawRect(0, 0, getWidth(), getHeight(), paintBackgroud);                //画第一条颜色重的线的画笔        Paint paintOne=new Paint();        paintOne.setColor(getResources().getColor(R.color.oneLine));                //画第二条颜色轻的线的画笔        Paint paintTwo=new Paint();        paintTwo.setColor(getResources().getColor(R.color.twoLine));                //画颜色重的线        Paint paintThree=new Paint();        paintThree.setColor(getResources().getColor(R.color.threeLine));        for(int i=0;i<9;i++){            canvas.drawLine(0, i*height, getWidth(), i*height, paintOne);            canvas.drawLine(0, i*height+1, getWidth(), i*height+1, paintTwo);            canvas.drawLine(i*width, 0, i*width, getHeight(), paintOne);            canvas.drawLine(i*width+1, 0, i*width+1, getHeight(), paintTwo);        }                for(int i=0;i<9;i++){            if(i%3 != 0){                continue;            }            canvas.drawLine(0, i*height, getWidth(), i*height, paintThree);            canvas.drawLine(0, i*height+1, getWidth(), i*height+1, paintTwo);            canvas.drawLine(i*width, 0, i*width, getHeight(),paintThree);            canvas.drawLine(i*width+1, 0, i*width+1, getHeight(), paintTwo);        }                //画数字的画笔        Paint paintData=new Paint();        paintData.setColor(getResources().getColor(R.color.textColor));        paintData.setStyle(Paint.Style.STROKE);        paintData.setTextSize((float) (height*0.75));        paintData.setTextAlign(Paint.Align.CENTER);                FontMetrics fm=paintData.getFontMetrics();        float x=width/2;        float y=height/2-(fm.ascent+fm.descent)/2;                for(int i=0;i<9;i++){            for(int j=0;j<9;j++){                canvas.drawText(game.getTileString(i,                        j), i*width+x, j*height+y, paintData);            }        }        super.onDraw(canvas);            }    @Override    public boolean onTouchEvent(MotionEvent event) {        if(event.getAction()!=event.ACTION_DOWN){            return super.onTouchEvent(event);        }                int selectedx=(int)(event.getX()/width);        int selectedy=(int)(event.getY()/height);                int used[]=game.getUsedByArray(selectedx, selectedy);        StringBuffer result=new StringBuffer(0);        for(int i=0; i<used.length;i++){            System.out.println(used[i]);            result=result.append(String.valueOf(used[i]));                    }                LayoutInflater layoutInflater=LayoutInflater.from(this.getContext());                View layout=layoutInflater.inflate(R.layout.dialog, null);                TextView textView=(TextView)layout.findViewById(R.id.textView1);        textView.setText(result);                        AlertDialog.Builder builder=new AlertDialog.Builder(this.getContext());        builder.setView(layout);        AlertDialog alertDialog=builder.create();        alertDialog.show();        return true;    }                }

1、Paint的设置方法setAntiAlias：设置画笔的锯齿效果setColor：设置画笔颜色setARGB：设置画笔的a、r、g、b值，接受整形参数。setAlpha：设置Alpha值setTextSize：设置字体尺寸setStyle：设置画笔风格，空心或者实心setStrokeWidth：设置空心的边框宽度getColor：得到画笔的颜色getAlpha：得到画笔的Alpha值2、使用Canvas绘制点、线和图形绘制直线：drawLine(float startX, float startY, float stopX, float stopY, Paint paint)绘制矩形：drawRect(float left, float top, float right, float bottom, Paint paint)绘制圆形：drawCircle(float cx, float cy, float radius, Paint paint)3、使用Canvas绘制文字drawText(String text, float x, float y, Paint paint)4、使用Canvas绘制图片的方法drawBitmap(Bitmap bitmap, float left, float top, Paint paint )相应的代码如下：canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher),100, 400, paint);

1、绘制九宫格2、在九宫格中放置数字MyView.java文件:package com.example.shudu03;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.view.View;public class MyView extends View {    public MyView(Context context) {        super(context);    }    private float width;    private float height;        @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        this.width=w/9f;        this.height=h/9f;        super.onSizeChanged(w, h, oldw, oldh);    }        @Override    protected void onDraw(Canvas canvas) {        //画背景        Paint paintBackgroud=new Paint();        paintBackgroud.setColor(getResources().getColor(R.color.backgroundColor));        canvas.drawRect(0, 0, getWidth(), getHeight(), paintBackgroud);                //画第一条颜色重的线的画笔        Paint paintOne=new Paint();        paintOne.setColor(getResources().getColor(R.color.oneLine));                //画第二条颜色轻的线的画笔        Paint paintTwo=new Paint();        paintTwo.setColor(getResources().getColor(R.color.twoLine));                //画横竖三条颜色重的线        Paint paintThree=new Paint();        paintThree.setColor(getResources().getColor(R.color.threeLine));        for(int i=0;i<9;i++){            canvas.drawLine(0, i*height, getWidth(), i*height, paintOne);            canvas.drawLine(0, i*height+1, getWidth(), i*height+1, paintTwo);            canvas.drawLine(i*width, 0, i*width, getHeight(), paintOne);            canvas.drawLine(i*width+1, 0, i*width+1, getHeight(), paintTwo);        }                for(int i=0;i<9;i++){            if(i%3 != 0){                continue;            }            canvas.drawLine(0, i*height, getWidth(), i*height, paintThree);            canvas.drawLine(0, i*height+1, getWidth(), i*height+1, paintTwo);            canvas.drawLine(i*width, 0, i*width, getHeight(),paintThree);            canvas.drawLine(i*width+1, 0, i*width+1, getHeight(), paintTwo);        }                //画数字的画笔        Paint paintData=new Paint();        paintData.setColor(getResources().getColor(R.color.textColor));        paintData.setStyle(Paint.Style.STROKE);        paintData.setTextSize((float) (height*0.75));        paintData.setTextAlign(Paint.Align.CENTER);                float x=width/2;        canvas.drawText("1", 3*width+x, 61, paintData);        super.onDraw(canvas);    }       }color.xml文件：<?xml version="1.0" encoding="utf-8"?><resources>    <color name="backgroundColor">#ffe2e5e7</color>    <color name="textColor">#ff252525</color>    <color name="oneLine">#ffeceff0</color>    <color name="twoLine">#fffbfbfb</color>    <color name="threeLine">#ff858585</color></resources>MainActivity.java文件：package com.example.shudu03;import android.os.Bundle;import android.app.Activity;import android.view.Menu;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//        setContentView(R.layout.activity_main);        setContentView(new MyView(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;    }} 

1、FontMetrics的使用方法FontMetrics fm=paint.getFontMetrics();top：baseLine到字符框的最顶端的高度，是负数bottom：baseLine到字符框的最低端的高度，是正数ascent：baseLine到字符视觉最顶端的高度，是负数descent：baseLine到字符视觉最顶端的高度，是正数(ascent+descent)/2 关键代码：float x=width/2;               float y=height/2 - (ascent+descent)/2Game.java文件：package com.example.shudu03;public class Game {    private final String str="360000000"+"004230800"    +"000004200"+"070460003"+"820000014"+"500013020"            +"001900000"+"007048300"+"000000045";    private int shuduku[]=new int[9*9];        public Game() {        shuduku=formPuzzleString(str);    }        //根据九宫格的坐标，返回该坐标所引该填写数据    private int getTile(int x,int y){        return shuduku[y*9+x];    }        //将九宫格坐标的数字转化为String类型    public String getTileString(int x,int y){        int v=getTile(x,y);        if(v==0){            return "";        }        else{            return String.valueOf(v);        }    }        protected int[] formPuzzleString(String str){        int[] shudu=new int[str.length()];        for(int i=0;i<shudu.length;i++){            shudu[i]=str.charAt(i)-'0';        }        return shudu;    }}MyView.java文件：package com.example.shudu03;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.view.View;public class MyView extends View {    public MyView(Context context) {        super(context);    }    private float width;    private float height;    private Game game=new Game();        @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        this.width=w/9f;        this.height=h/9f;        super.onSizeChanged(w, h, oldw, oldh);    }        @Override    protected void onDraw(Canvas canvas) {        //画背景        Paint paintBackgroud=new Paint();        paintBackgroud.setColor(getResources().getColor(R.color.backgroundColor));        canvas.drawRect(0, 0, getWidth(), getHeight(), paintBackgroud);                //画第一条颜色重的线的画笔        Paint paintOne=new Paint();        paintOne.setColor(getResources().getColor(R.color.oneLine));                //画第二条颜色轻的线的画笔        Paint paintTwo=new Paint();        paintTwo.setColor(getResources().getColor(R.color.twoLine));                //画颜色重的线        Paint paintThree=new Paint();        paintThree.setColor(getResources().getColor(R.color.threeLine));        for(int i=0;i<9;i++){            canvas.drawLine(0, i*height, getWidth(), i*height, paintOne);            canvas.drawLine(0, i*height+1, getWidth(), i*height+1, paintTwo);            canvas.drawLine(i*width, 0, i*width, getHeight(), paintOne);            canvas.drawLine(i*width+1, 0, i*width+1, getHeight(), paintTwo);        }                for(int i=0;i<9;i++){            if(i%3 != 0){                continue;            }            canvas.drawLine(0, i*height, getWidth(), i*height, paintThree);            canvas.drawLine(0, i*height+1, getWidth(), i*height+1, paintTwo);            canvas.drawLine(i*width, 0, i*width, getHeight(),paintThree);            canvas.drawLine(i*width+1, 0, i*width+1, getHeight(), paintTwo);        }                //画数字的画笔        Paint paintData=new Paint();        paintData.setColor(getResources().getColor(R.color.textColor));        paintData.setStyle(Paint.Style.STROKE);        paintData.setTextSize((float) (height*0.75));        paintData.setTextAlign(Paint.Align.CENTER);                FontMetrics fm=paintData.getFontMetrics();        float x=width/2;        float y=height/2-(fm.ascent+fm.descent)/2;                for(int i=0;i<9;i++){            for(int j=0;j<9;j++){                canvas.drawText(game.getTileString(i,                        j), i*width+x, j*height+y, paintData);            }        }        super.onDraw(canvas);            }                }