android自定义View实现裁剪图片功能，不使用系统的

闲来无事，今天写了一下怎么裁剪图片，写的很烂，放在这里以后看看自己有没有进步.............

首先给个效果图了...........

1,拖动矩形框，红色矩形框以外是一个半透明的罩，通过画出四个半透明的矩形，可以实现效果

2，拖动红框及拉伸红框获取坐标,拉伸只能通过红框的上面那个红线点击向外移动放大，向左里移动缩小，哈哈，还有很多地方没有做，不想做了，懒啊，有想法的时候再做吧.......

3，点击红框以外的地方时候，会保存裁剪图片，最后点击save去掉自定义的view，把裁剪的图片放在imageview里面。(底层有个图片是本身imageview有的哦)

代码实现：

自定义view：

package com.zte.caijian;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.util.Log;import android.view.MotionEvent;import android.view.View;public class myView extends View {private int l = 20;private int t = 20;private int r = 100;private int b = 100;Bitmap bitmap;Bitmap bitmapOld;@SuppressLint({ "NewApi", "NewApi" })public myView(Context context, Bitmap bitmap) {super(context);this.bitmap = Bitmap.createScaledBitmap(bitmap, 480, 540, true);// setBackgroundColor(Color.BLACK);// setAlpha(0.8f);}int xy[] = new int[2];int temp[] = new int[2];int tempM[] = new int[2];boolean mFlag = false;boolean mFlagM = false;boolean mFlag1 = false;boolean mFlag2 = false;boolean kaishi = true;int change = 0;@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:xy[0] = (int) event.getX();xy[1] = (int) event.getY();if (xy[0] < r && xy[0] > l && xy[1] < b && xy[1] > t) {mFlag2 = false;mFlag = true;mFlag1 = false;} else {mFlag = false;}if (xy[0] < r && xy[0] > l && xy[1] == t) {mFlag1 = true;} else {if (tmL == 0 || tmR == 0 || tmT == 0) {} else {if (bitmapOld == null) {Log.i("RG", "bitmap--->>>h" + bitmap.getHeight());Log.i("RG", "bitmap--->>>W" + bitmap.getWidth());Log.i("RG", "tmL--->>>W" + tmL);Log.i("RG", "tmT--->>>W" + tmT);Log.i("RG", "tmR--->>>W" + tmR);Log.i("RG", "tmB--->>>W" + tmB);bitmapOld = Bitmap.createBitmap(bitmap, tmL, tmT, tmR- tmL, tmB - tmT, null, true);} else {bitmapOld = null;bitmapOld = Bitmap.createBitmap(bitmap, tmL, tmT, tmR- tmL, tmB - tmT, null, true);}}}case MotionEvent.ACTION_MOVE:temp[0] = (int) event.getX();temp[1] = (int) event.getY();if (mFlag) {if (xy[0] == temp[0] && xy[1] == temp[1]) {} else {mFlagM = true;l = temp[0];t = temp[1];if (tuodongH > 0) {r = l + tuodongW;b = t + tuodongH;} else {r = l + 80;b = t + 80;}invalidate();}}if (mFlag1) {Log.i("RG", "panduanl you wentil ---->>>" + xy[0] + ",,,,"+ xy[1]);if (temp[0] > xy[0] || temp[1] < xy[1]) {Log.i("RG", "-------mFlag1------>>>>>>" + temp[0] + ",,,,"+ temp[1]);mFlag2 = true;change += 5;// l = xy[0];// t = xy[1];tempM[0] = r = (l + 80) + change;tempM[1] = b = (t + 80) + change;invalidate();} else {change -= 5;tempM[0] = r = (l + 80) + change;tempM[1] = b = (t + 80) + change;invalidate();}}}return true;}int tuodongH;int tuodongW;int tmL;int tmT;int tmR;int tmB;public Bitmap getBitmap() {return bitmapOld;}public void Pcanvas(Canvas canvas) {Paint mPaint = new Paint();mPaint.setStyle(Style.STROKE);mPaint.setStrokeMiter(6);mPaint.setStrokeWidth(3);mPaint.setColor(Color.RED);canvas.drawRect(l, t, r, b, mPaint);tuodongH = b - t;tuodongW = r - l;Paint mPaint1 = new Paint();mPaint1.setColor(Color.BLACK);mPaint1.setAlpha(100);canvas.drawRect(0, 0, 480, t, mPaint1);// 1111canvas.drawRect(0, b, 480, 800, mPaint1);canvas.drawRect(0, t, l, b, mPaint1);canvas.drawRect(r, t, 480, b, mPaint1);}@Overrideprotected void onDraw(Canvas canvas) {if (mFlag1 && mFlag2) {Pcanvas(canvas);// mFlag1 = false;// mFlag2 = false;return;}if (mFlag == true && mFlagM == true) {Paint mPaint = new Paint();mPaint.setStyle(Style.STROKE);mPaint.setStrokeMiter(6);mPaint.setStrokeWidth(3);mPaint.setColor(Color.RED);canvas.drawRect(l, t, r, b, mPaint);tmL = l;tmT = t;tmR = r;tmB = b;Paint mPaint1 = new Paint();mPaint1.setColor(Color.BLACK);mPaint1.setAlpha(100);canvas.drawRect(0, 0, 480, t, mPaint1);// 1111canvas.drawRect(0, b, 480, 800, mPaint1);canvas.drawRect(0, t, l, b, mPaint1);canvas.drawRect(r, t, 480, b, mPaint1);return;}if (kaishi) {Paint mPaint = new Paint();mPaint.setStyle(Style.STROKE);mPaint.setStrokeMiter(6);mPaint.setStrokeWidth(3);mPaint.setColor(Color.RED);canvas.drawRect(l, t, r, b, mPaint);Paint mPaint1 = new Paint();mPaint1.setColor(Color.BLACK);mPaint1.setAlpha(100);canvas.drawRect(0, 0, 480, t, mPaint1);// 1111canvas.drawRect(0, b, 480, 800, mPaint1);canvas.drawRect(0, t, l, b, mPaint1);canvas.drawRect(r, t, 480, b, mPaint1);kaishi = false;} else {return;}super.onDraw(canvas);}}

下面是mainactivity类使用myview及监听事件：

package com.zte.caijian;import android.os.Bundle;import android.annotation.SuppressLint;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup.LayoutParams;import android.widget.Button;import android.widget.ImageView;import android.widget.LinearLayout;import android.support.v4.app.NavUtils;public class MainActivity extends Activity implements OnClickListener {Button save;Button cencal;ImageView mImageView;ImageView mCaijian;myView my;Bitmap bitmap;LayoutParams lp = new LayoutParams(480, 600);@SuppressLint("NewApi")@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.aa);my = new myView(MainActivity.this, bitmap);LinearLayout layout = new LinearLayout(MainActivity.this);layout.addView(my);layout.setTop(50);this.addContentView(layout, lp);}private void init() {save = (Button) findViewById(R.id.save);cencal = (Button) findViewById(R.id.cencal);mImageView = (ImageView) findViewById(R.id.imageview);mCaijian = (ImageView) findViewById(R.id.caijian);save.setOnClickListener(this);cencal.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.save:Log.i("RG", "CLICK-----");Bitmap bitmap = my.getBitmap();mImageView.setImageBitmap(bitmap);break;case R.id.cencal:MainActivity.this.finish();break;}}}

xml布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="wrap_content"    android:layout_height="wrap_content" >    <ImageView        android:id="@+id/imageview"        android:layout_width="480dip"        android:layout_height="360dip"        android:background="@drawable/aa" />    <Button        android:id="@+id/save"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="400dip"        android:text="save" />    <Button        android:id="@+id/cencal"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_marginTop="400dip"        android:text="cencal" />    <ImageView        android:id="@+id/caijian"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="400dip"        android:layout_centerHorizontal="true" /></RelativeLayout>

还有很多的地方不足...............如果有哪位该人能够给个简单的方法就好啊......,代码很看，可不要喷饭哦............

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