android 随手涂鸦

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在平时开发中，有时会有类似于画画板随手涂鸦的程序，可以在手机上画出一些图案，写字等，此程序重在思路，接下来直接上代码

1、布局文件 activity_main.xml

</RelativeLayout>

2、MainActivity.java代码

package com.ilemi.paint;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Environment;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener
{
private ImageView imageview=null;
private Button clear=null;
private Button save=null;
private MyOntouchListener touchlistener;//手势监听事件
private Bitmap bitmap;
private Canvas canvas;//画板
private Paint paint;//画笔
private int DownX=0;//按下时的横坐标
private int DownY=0;//按下时有竖坐标
private int MoveX=0;//移动时有横坐标
private int MoveY=0;//移动时有竖坐标
private Toast toast=null;//消息提示框
@Override
protected void onCreate(Bundle savedInstanceState)
{
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  initview();
}
private void initview()
{
  if(imageview==null)
  {
   imageview=(ImageView)this.findViewById(R.id.imageview);
  }
  if(clear==null)
  {
   clear=(Button)this.findViewById(R.id.clear);
  }
  if(save==null)
  {
   save=(Button)this.findViewById(R.id.save);
  }
  if(touchlistener==null)
  {
   touchlistener=new MyOntouchListener();
  }
  imageview.setOnTouchListener(touchlistener);
  clear.setOnClickListener(this);
  save.setOnClickListener(this);
}

private class MyOntouchListener implements OnTouchListener
{

  @Override
  public boolean onTouch(View v,MotionEvent event)
  {
   int event_action=event.getAction();
   switch(event.getAction())
   {
    case MotionEvent.ACTION_DOWN:
     initbitmap();
     DownX=(int)event.getX();
     DownY=(int)event.getY();
     break;
    case MotionEvent.ACTION_MOVE:
     MoveX=(int)event.getX();
     MoveY=(int)event.getY();
     if(canvas==null)
     {
      initbitmap();
     }
     canvas.drawLine(DownX,DownY,MoveX,MoveY,paint);
     DownX=MoveX;
     DownY=MoveY;
     imageview.setImageBitmap(bitmap);
     break;
    case MotionEvent.ACTION_UP:
     break;
   }
   return true;
  }
}
@Override
public void onClick(View v)
{
  if(bitmap==null)
  {
   return ;
  }
  switch(v.getId())
  {
   case R.id.clear:
    canvas.drawColor(Color.GREEN);
    imageview.setImageBitmap(bitmap);
    break;
   case R.id.save:
    save();
    break;
  }
}
private void initbitmap()
{
  if(bitmap==null)
  {
   bitmap=Bitmap.createBitmap(imageview.getWidth(),imageview.getHeight(),Config.ARGB_4444);
   canvas=new Canvas(bitmap);
   paint=new Paint();
   paint.setColor(Color.RED);
   paint.setStrokeWidth(5);
   canvas.drawColor(Color.GREEN);
  }
  imageview.setImageBitmap(bitmap);
}
private void save()
{
  //获取sd卡路经
  File CacheDir=Environment.getExternalStorageState().endsWith(Environment.MEDIA_MOUNTED)? Environment.getExternalStorageDirectory():getCacheDir();
  Date date=new Date();
  SimpleDateFormat sdf=new SimpleDateFormat("yyyy_MM_DD_HH_mm_ss");
  String file_name=sdf.format(date)+".jpg";
  File CacheFile=new File(CacheDir,file_name);
  try
  {
   FileOutputStream fos=new FileOutputStream(CacheFile);
   boolean issuccessful=bitmap.compress(CompressFormat.JPEG,100,fos);
   show(issuccessful);
  }
  catch(FileNotFoundException e)
  {

   e.printStackTrace();
   show(false);
  }
}
private void show(boolean issuccessful)
{
  toast=Toast.makeText(MainActivity.this,issuccessful?R.string.save_successful:R.string.save_fail,0);
  if(!toast.getView().isShown())
  {
   toast.show();
  }
}
}

3、strings.xml

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

    <string name="app_name">随手涂鸦</string>
    <string name="hello_world">Hello world!</string>
    <string name="clear">清除</string>
    <string name="save">保存</string>
    <string name="save_successful">保存成功</string>
     <string name="save_fail">保存失败</string>
</resources>

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