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突然不知道什么心态，说要做这个，网上找了半天没找到合适的，就自己做了一个。
先上效果图：
透明区域为将要截取的区域，其他阴影部位为舍弃区域
图片资源我写死储存在了raw中，有需要可以自己写获取bitmap。
界面layout：
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<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.admin.myapplication.mainactivity">
<com.admin.myapplication.screenshotview
android:id="@+id/screenshotview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<linearlayout
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="30dp"
android:background="#000000">
<textview
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_gravity="center"
android:gravity="center"
android:text="选择要截取区域"/>
</linearlayout>
<linearlayout
android:id="@+id/bottom"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_alignparentbottom="true"
android:background="#000000"
android:orientation="horizontal">
<textview
android:id="@+id/cancel_btn"
android:text="取消"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:gravity="center"/>
<textview
android:id="@+id/certain_btn"
android:text="确定"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:gravity="center"/>
<textview
android:id="@+id/restart_btn"
android:text="重试"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:gravity="center"/>
</linearlayout>
</relativelayout>
screenshotview为自定义view用来显示bitmap，以及滑动截图，其中dot类用来储存坐标点的x，y值。
public class screenshotview extends view {
private dot startdot;
private dot enddot;
private bitmap mbitmap;
private bitmap ocrbitmap;
private int screenheight;
private int screenwidth;
private dot lefttopdot;
private dot rightbottomdot;
private paint paintshadow;
int shadow = 0xaa000000;
int clear = 0x0000000;
public screenshotview(context context) {
super(context);
startdot = new dot();
enddot = new dot();
lefttopdot = new dot();
rightbottomdot = new dot();
}
public screenshotview(context context, @nullable attributeset attrs) {
super(context, attrs);
startdot = new dot();
enddot = new dot();
lefttopdot = new dot();
rightbottomdot = new dot();
}
public screenshotview(context context, @nullable attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
startdot = new dot();
enddot = new dot();
lefttopdot = new dot();
rightbottomdot = new dot();
}
public void setbitmap(bitmap bitmap, int screenheight, int screenwidth) {
mbitmap = bitmap;
this.screenheight = screenheight;
this.screenwidth = screenwidth;
changebitmapsize();
invalidate();
}
public void restart(){
startdot = new dot();
enddot = new dot();
lefttopdot = new dot();
rightbottomdot = new dot();
invalidate();
}
/**
*将将要显示的bitmap进行变形，使其铺满屏幕
*
*/
private void changebitmapsize() {
int width = mbitmap.getwidth();
int height = mbitmap.getheight();
float scalewidth = ((float) screenwidth) / width;
float scaleheight = ((float) screenheight) / height;
matrix matrix = new matrix();
matrix.postscale(scalewidth, scaleheight);
mbitmap = bitmap.createbitmap(mbitmap, 0, 0, width, height, matrix, true);
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
getlefttopdot();
getrightbottomdot();
drawbitmap(canvas);
drawarea(canvas);
drawshadowtop(canvas);
drawshadowleft(canvas);
drawshadowright(canvas);
drawshadowbottom(canvas);
}
/**
*绘制阴影
*
*/
private void drawshadowbottom(canvas canvas) {
paintshadow = new paint();
paintshadow.setcolor(shadow);
canvas.drawrect(0, rightbottomdot.gety(), screenwidth, screenheight, paintshadow);
}
private void drawshadowright(canvas canvas) {
paintshadow = new paint();
paintshadow.setcolor(shadow);
canvas.drawrect(rightbottomdot.getx(), lefttopdot.gety(), screenwidth, rightbottomdot.gety(), paintshadow);
}
private void drawshadowleft(canvas canvas) {
paintshadow = new paint();
paintshadow.setcolor(shadow);
canvas.drawrect(0, lefttopdot.gety(), lefttopdot.getx(), rightbottomdot.gety(), paintshadow);
}
private void drawshadowtop(canvas canvas) {
paintshadow = new paint();
paintshadow.setcolor(shadow);
canvas.drawrect(0, 0, screenwidth, lefttopdot.gety(), paintshadow);
}
private void drawbitmap(canvas canvas) {
paint paint = new paint();
canvas.drawbitmap(mbitmap, 0, 0, paint);
}
/**
* 画出截图区域
*
* @param canvas
*/
private void drawarea(canvas canvas) {
paint paint = new paint();
paint.setcolor(clear);
canvas.drawrect(lefttopdot.getx(), lefttopdot.gety(), rightbottomdot.getx(), rightbottomdot.gety(), paint);
}
/**
* 获取截图区域bitmap
*
* @return 截图
*/
public bitmap getbitmap() {
if (mbitmap != null) {
getlefttopdot();
getrightbottomdot();
if (getbitmapoutwidth() > 0 && getbitmapoutheight() > 0) {
if(lefttopdot.gety()<0){
lefttopdot.sety(0);
}
ocrbitmap = bitmap.createbitmap(mbitmap, (int) lefttopdot.getx(), (int) lefttopdot.gety(), getbitmapoutwidth(), getbitmapoutheight());
}
}
return ocrbitmap;
}
/**
* 获取截图区域宽度
*
* @return
*/
private int getoutwidth() {
return (int) (rightbottomdot.getx() - lefttopdot.getx());
}
/**
* 获取截图区域高度
*
* @return
*/
private int getoutheight() {
return (int) (rightbottomdot.gety() - lefttopdot.gety());
}
private int getbitmapoutwidth() {
int bitmapoutwidth;
int scale = getoutwidth() * mbitmap.getwidth();
bitmapoutwidth = scale / screenwidth;
return bitmapoutwidth;
}
private int getbitmapoutheight() {
int bitmapoutheight;
int scale = getoutheight() * mbitmap.getheight();
bitmapoutheight = scale / screenheight;
return bitmapoutheight;
}
private void getlefttopdot() {
if (enddot.getx() > startdot.getx()) {
lefttopdot.setx(startdot.getx());
} else {
lefttopdot.setx(enddot.getx());
}
if (enddot.gety() > startdot.gety()) {
lefttopdot.sety(startdot.gety());
} else {
lefttopdot.sety(enddot.gety());
}
}
private void getrightbottomdot() {
if (startdot.getx() > enddot.getx()) {
rightbottomdot.setx(startdot.getx());
} else {
rightbottomdot.setx(enddot.getx());
}
if (startdot.gety() > enddot.gety()) {
rightbottomdot.sety(startdot.gety());
} else {
rightbottomdot.sety(enddot.gety());
}
}
public dot getstartdot() {
return startdot;
}
public void setstartdot(dot startdot) {
this.startdot = startdot;
}
public dot getenddot() {
return enddot;
}
public void setenddot(dot enddot) {
this.enddot = enddot;
}
}
mainactivity中完成对点击滑动的监控，通过坐标点的方式获得需要绘制的矩形位置和形状。
public class mainactivity extends appcompatactivity implements view.ontouchlistener, view.onclicklistener {
private screenshotview screenshotview;
private bitmap bmp;
private bitmap ocrbitmap;
private textview certainbtn;
private textview cancelbtn;
private textview restartbtn;
private int screenwidth;
private int screenheight;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
screenshotview = (screenshotview) findviewbyid(r.id.screenshotview);
cancelbtn = (textview) findviewbyid(r.id.cancel_btn);
cancelbtn.setonclicklistener(this);
certainbtn = (textview) findviewbyid(r.id.certain_btn);
certainbtn.setonclicklistener(this);
restartbtn = (textview)findviewbyid(r.id.restart_btn);
restartbtn.setonclicklistener(this);
displaymetrics dm = new displaymetrics();
//获取屏幕信息
getwindowmanager().getdefaultdisplay().getmetrics(dm);
screenwidth = dm.widthpixels;
screenheight = dm.heightpixels;
resources r = this.getresources();
inputstream is = r.openrawresource(r.raw.bg);
bitmapdrawable bmpdraw = new bitmapdrawable(is);
bmp = bmpdraw.getbitmap();
screenshotview.setbitmap(bmp, screenheight, screenwidth);
screenshotview.setontouchlistener(this);
}
@override
public boolean ontouch(view view, motionevent motionevent) {
switch (motionevent.getaction()) {
case motionevent.action_down:
screenshotview.setstartdot(new dot(motionevent.getx(), motionevent.gety()));
break;
case motionevent.action_move:
screenshotview.setenddot(new dot(motionevent.getx(), motionevent.gety()));
screenshotview.setbitmap(bmp, screenheight, screenwidth);
break;
case motionevent.action_up:
ocrbitmap = screenshotview.getbitmap();
break;
}
return true;
}
@override
public void onclick(view view) {
switch (view.getid()) {
case r.id.cancel_btn:
finish();
break;
case r.id.certain_btn:
if (ocrbitmap != null) {
bitmaputil.getinstance().setimagebitmap(ocrbitmap);
intent intent = new intent(mainactivity.this, main2activity.class);
startactivity(intent);
}else{
toast.maketext(mainactivity.this,"请选择截取区域",toast.length_short).show();
}
break;
case r.id.restart_btn:
screenshotview.restart();
break;
}
}
@override
protected void onresume() {
super.onresume();
screenshotview.restart();
}
@override
protected void onrestart() {
super.onrestart();
screenshotview.restart();
}
}
运用了单例模式用来存储截取出来的bitmap，方便跳转时调用，不需要自己再写类，点击确定后，会将区域中的bitmap提取并存储在单例中，在下一个页面再调用。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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