画图并保存

package com.gyarmy.paintpic;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Intent;
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.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity implements OnClickListener, OnSeekBarChangeListener, OnTouchListener {
	private static final String TAG = "菜单栏.";
	private View view_red;
	private View view_green;
	private View view_blue;
	private View view_yellow;
	private View view_pink;
	private SeekBar sb_bar;
	private ImageView iv;
	
	private Bitmap bitmap;
	private Canvas canvas;
	private Paint paint;
	
	float startX = 0;
	float startY = 0;
	int paintSize =1;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        view_red = findViewById(R.id.view_red);
        view_green = findViewById(R.id.view_green);
        view_blue = findViewById(R.id.view_blue);
        view_yellow = findViewById(R.id.view_yellow);
        view_pink = findViewById(R.id.view_pink);
        
        sb_bar = (SeekBar) findViewById(R.id.skb_size);
        iv = (ImageView) findViewById(R.id.iv);
        
        
        view_red.setOnClickListener(this);
        view_green.setOnClickListener(this);
        view_blue.setOnClickListener(this);
        view_yellow.setOnClickListener(this);
        view_pink.setOnClickListener(this);
        
        sb_bar.setOnSeekBarChangeListener(this);
        
        iv.setOnTouchListener(this);
        
        //绘制图片
        bitmap = Bitmap.createBitmap(480, 660, Config.ARGB_8888);
        canvas = new Canvas(bitmap);
        canvas.drawColor(Color.WHITE);
        paint = new Paint();
        
    }

    //选取颜色
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		
		if(v == view_red ){
			paint.setColor(Color.RED);
		}else if(v == view_green){
			paint.setColor(Color.GREEN);
		}else if(v == view_blue){
			paint.setColor(Color.BLUE);
		}else if(v == view_yellow){
			paint.setColor(Color.YELLOW);
		}else if(v == view_pink){
			paint.setColor(Color.argb(255, 255, 80, 255));
		}
		
		
	}

	//画笔粗细	
	@Override
	public void onProgressChanged(SeekBar seekBar, int progress,
			boolean fromUser) {
		// TODO Auto-generated method stub
		paintSize = progress;
		
	}


	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
		// TODO Auto-generated method stub
		
	}


	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
		// TODO Auto-generated method stub
		paint.setStrokeWidth(paintSize);
		paint.setAntiAlias(true);
	}
	
	
	//绘画
	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// TODO Auto-generated method stub
		
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			startX = event.getX();
			startY = event.getY();
			
			break;
			
		case MotionEvent.ACTION_MOVE:
			float endX = event.getX();
			float endY = event.getY();
			canvas.drawLine(startX, startY, endX, endY, paint);
			iv.setImageBitmap(bitmap);
			startX = endX;
			startY = endY;
			
			break;
			
		case MotionEvent.ACTION_UP:
			
			break;
			
		default:
			break;
		}
		
		//显示数据
		return true;
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// TODO Auto-generated method stub
		//菜单
		getMenuInflater().inflate(R.menu.main, menu);
		
		return super.onCreateOptionsMenu(menu);
	}
	
	
	@Override
	public boolean onMenuItemSelected(int featureId, MenuItem item) {
		// TODO Auto-generated method stub
		
		int itemId = item.getItemId();
		
		switch (itemId) {
		case R.id.item_save:
			Log.d(TAG, " - 按钮保存了");
			//保存图片
			File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis()+".jpg");
			Log.d(TAG, Environment.getExternalStorageDirectory().toString()+System.currentTimeMillis()+".jpg");
			FileOutputStream  fos = null;
			
			try {
				fos = new FileOutputStream(file);
				bitmap.compress(CompressFormat.JPEG, 100, fos);
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				if(fos!=null)
				{
					try {
						fos.close();
						fos=null;
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					
				}
				
				//广播
				//异常
				/*
				Intent intent = new Intent(Intent.ACTION_MEDIA_MOUNTED);
				intent.setData(Uri.parse(Environment.getExternalStorageDirectory().toString()));
				sendBroadcast(intent);
				*/
				
				//无效
				//sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(Environment.getExternalStorageDirectory()+"")));  
				
				MediaScannerConnection.scanFile(this, new String[]{Environment.getExternalStorageDirectory()+""}, null, null);
				
				
			}
			
			
			
			
			
			
			
			break;

		default:
			break;
		}
		
		
		
		
		return super.onMenuItemSelected(featureId, item);
	}
	


    
}