标签：touch nal color widget convert gen ase find uri
package com.itheima.paintboard; import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream; 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.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Bitmap.CompressFormat;import android.view.Menu;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.ImageView; public class MainActivity extends Activity { private int startX; private int startY; private Paint paint; private Canvas canvas; private ImageView iv; private Bitmap bmCopy; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Bitmap bmSrc = BitmapFactory.decodeResource(getResources(), R.drawable.bg); //白纸 bmCopy = Bitmap.createBitmap(bmSrc.getWidth(), bmSrc.getHeight(), bmSrc.getConfig()); //笔 paint = new Paint(); //画板 canvas = new Canvas(bmCopy); //作画 canvas.drawBitmap(bmSrc, new Matrix(), paint); iv = (ImageView) findViewById(R.id.iv); iv.setImageBitmap(bmCopy); iv.setOnTouchListener(new OnTouchListener() { //用户手指只要触摸屏幕，就会产生触摸事件 @Override public boolean onTouch(View v, MotionEvent event) { //判断触摸事件的类型 switch (event.getAction()) { //手指触摸 case MotionEvent.ACTION_DOWN: //触摸事件中会包含手指触摸的坐标 startX = (int) event.getX(); startY = (int) event.getY(); break; //手指滑动 case MotionEvent.ACTION_MOVE: int newX = (int) event.getX(); int newY = (int) event.getY(); //指定线的起点和终点 canvas.drawLine(startX, startY, newX, newY, paint); //刷新,因为每次滑动绘画时，图片保存在缓存里，所以需要重新设置ImageView进行刷新到界面上 iv.setImageBitmap(bmCopy); //把本此画线的终点设置为下一次画线的起点 startX = newX; startY = newY; break; //手指抬起 case MotionEvent.ACTION_UP: break; } //true表示告诉系统，这个触摸事件由iv处理 //false表示不处理该触摸事件，事件往上传递 return true; } }); } public void red(View v){ paint.setColor(Color.RED); } public void green(View v){ paint.setColor(Color.GREEN); } public void brush(View v){ //改变线条粗细 paint.setStrokeWidth(8); } public void save(View v){ File file = new File("sdcard/dazuo.png"); FileOutputStream fos; try { fos = new FileOutputStream(file); //把图片压缩到本地文件 bmCopy.compress(CompressFormat.PNG, 100, fos); fos.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } //手动发一个sd卡就绪广播 Intent intent = new Intent(); intent.setAction(Intent.ACTION_MEDIA_MOUNTED); intent.setData(Uri.fromFile(Environment.getExternalStorageDirectory())); sendBroadcast(intent); } }标签：touch nal color widget convert gen ase find uri
原文地址：http://www.cnblogs.com/SoulCode/p/6393342.html
