首先看一下界面,很简单
配置读取内存卡和调用照相头的功能
代码如下 | 复制代码 |
<!-- 使用网络权限 --> < uses-permission android:name = "android.permission.INTERNET" /> <!-- 写sd卡的权限 --> < uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE" /> <!-- 读sd卡权限 --> < uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE" /> < uses-permission android:name = "android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> |
下面是代码的主题
代码如下 | 复制代码 |
publicclassTakePhotosextendsActivityimplements android.view.View.OnClickListener { Button takePhoto; Bitmap photo; String picPath; Button capture; @Override protectedvoidonCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_photo); takePhoto = (Button) findViewById(R.id.button1); capture = (Button) findViewById(R.id.capture); takePhoto.setOnClickListener(this); capture.setOnClickListener(this); } @Override publicvoidonClick(View viewid) { switch(viewid.getId()) { caseR.id.button1: {// 打开相机 String state = Environment.getExternalStorageState();// 获取内存卡可用状态 if(state.equals(Environment.MEDIA_MOUNTED)) { // 内存卡状态可用 Intent intent =newIntent("android.media.action.IMAGE_CAPTURE"); startActivityForResult(intent,1); }else{ // 不可用 Toast.makeText(TakePhotos.this,"内存不可用", Toast.LENGTH_LONG) .show(); } break; } caseR.id.capture: {// 打开相册 // 打开本地相册 Intent i =newIntent( Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); // 设定结果返回 startActivityForResult(i,2); break; } default: break; } }
@Override protectedvoidonActivityResult(intrequestCode,intresultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if(data !=null) { switch(requestCode) { case1: // 两种方式 获取拍好的图片 if(data.getData() !=null|| data.getExtras() !=null) {// 防止没有返回结果 Uri uri = data.getData(); if(uri !=null) { this.photo = BitmapFactory.decodeFile(uri.getPath());// 拿到图片 } if(photo ==null) { Bundle bundle = data.getExtras(); if(bundle !=null) { photo = (Bitmap) bundle.get("data"); FileOutputStream fileOutputStream =null; try{ // 获取 SD 卡根目录 生成图片并 String saveDir = Environment .getExternalStorageDirectory() +"/dhj_Photos"; // 新建目录 File dir =newFile(saveDir); if(!dir.exists()) dir.mkdir(); // 生成文件名 SimpleDateFormat t =newSimpleDateFormat( "yyyyMMddssSSS"); String filename ="MT"+ (t.format(newDate())) +".jpg"; // 新建文件 File file =newFile(saveDir, filename); // 打开文件输出流 fileOutputStream =newFileOutputStream(file); // 生成图片文件 this.photo.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream); // 相片的完整路径 this.picPath = file.getPath(); ImageView imageView = (ImageView) findViewById(R.id.imageView1); imageView.setImageBitmap(this.photo); }catch(Exception e) { e.printStackTrace(); }finally{ if(fileOutputStream !=null) { try{ fileOutputStream.close(); }catch(Exception e) { e.printStackTrace(); } } } Toast.makeText(getApplicationContext(),"获取到了", Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(getApplicationContext(),"找不到图片", Toast.LENGTH_SHORT).show(); } } } break; case2: { //打开相册并选择照片,这个方式选择单张 // 获取返回的数据,这里是android自定义的Uri地址 Uri selectedImage = data.getData(); String[] filePathColumn = { MediaStore.Images.Media.DATA }; // 获取选择照片的数据视图 Cursor cursor = getContentResolver().query(selectedImage, filePathColumn,null,null,null); cursor.moveToFirst(); // 从数据视图中获取已选择图片的路径 intcolumnIndex = cursor.getColumnIndex(filePathColumn[0]); String picturePath = cursor.getString(columnIndex); cursor.close(); // 将图片显示到界面上 ImageView imageView = (ImageView) findViewById(R.id.imageView1); imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath)); break; } default: break; } } } } |
注释的很详细,自己分析吧。
本文介绍了Android自定义漂亮的圆形进度条的教程,实现后效果很棒,大家可以动手尝试一下哦!这几天对Android中实现画圆弧及圆弧效果中所实现的效果进行了修改,改为进度圆心进度条,效果如图所示
TasksCompletedView.java 代码如下
代码如下 | 复制代码 |
importandroid.content.Context; importandroid.content.res.TypedArray; importandroid.graphics.Canvas; importandroid.graphics.Paint; importandroid.graphics.RectF; importandroid.graphics.Paint.FontMetrics; importandroid.util.AttributeSet; importandroid.view.View;
importcom.snailws.taskscompleted.R;
/** * @author naiyu(http://snailws.com) * @version 1.0 */ publicclassTasksCompletedViewextendsView {
// 画实心圆的画笔 privatePaint mCirclePaint; // 画圆环的画笔 privatePaint mRingPaint; // 画字体的画笔 privatePaint mTextPaint; // 圆形颜色 privateintmCircleColor; // 圆环颜色 privateintmRingColor; // 半径 privatefloatmRadius; // 圆环半径 privatefloatmRingRadius; // 圆环宽度 privatefloatmStrokeWidth; // 圆心x坐标 privateintmXCenter; // 圆心y坐标 privateintmYCenter; // 字的长度 privatefloatmTxtWidth; // 字的高度 privatefloatmTxtHeight; // 总进度 privateintmTotalProgress =100; // 当前进度 privateintmProgress;
publicTasksCompletedView(Context context, AttributeSet attrs) { super(context, attrs); // 获取自定义的属性 initAttrs(context, attrs); initVariable(); }
privatevoidinitAttrs(Context context, AttributeSet attrs) { TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.TasksCompletedView,0,0); mRadius = typeArray.getDimension(R.styleable.TasksCompletedView_radius,80); mStrokeWidth = typeArray.getDimension(R.styleable.TasksCompletedView_strokeWidth,10); mCircleColor = typeArray.getColor(R.styleable.TasksCompletedView_circleColor,0xFFFFFFFF); mRingColor = typeArray.getColor(R.styleable.TasksCompletedView_ringColor,0xFFFFFFFF);
mRingRadius = mRadius + mStrokeWidth /2; }
privatevoidinitVariable() { mCirclePaint =newPaint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setColor(mCircleColor); mCirclePaint.setStyle(Paint.Style.FILL); mRingPaint =newPaint(); mRingPaint.setAntiAlias(true); mRingPaint.setColor(mRingColor); mRingPaint.setStyle(Paint.Style.STROKE); mRingPaint.setStrokeWidth(mStrokeWidth); mTextPaint =newPaint(); mTextPaint.setAntiAlias(true); mTextPaint.setStyle(Paint.Style.FILL); mTextPaint.setARGB(255,255,255,255); mTextPaint.setTextSize(mRadius /2); FontMetrics fm = mTextPaint.getFontMetrics(); mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);
}
@Override protectedvoidonDraw(Canvas canvas) {
mXCenter = getWidth() /2; mYCenter = getHeight() /2;
canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);
if(mProgress >0) { RectF oval =newRectF(); oval.left = (mXCenter - mRingRadius); oval.top = (mYCenter - mRingRadius); oval.right = mRingRadius *2+ (mXCenter - mRingRadius); oval.bottom = mRingRadius *2+ (mYCenter - mRingRadius); canvas.drawArc(oval, -90, ((float)mProgress / mTotalProgress) *360,false, mRingPaint);// // canvas.drawCircle(mXCenter, mYCenter, mRadius + mStrokeWidth / 2, mRingPaint); String txt = mProgress +"%"; mTxtWidth = mTextPaint.measureText(txt,0, txt.length()); canvas.drawText(txt, mXCenter - mTxtWidth /2, mYCenter + mTxtHeight /4, mTextPaint); } }
publicvoidsetProgress(intprogress) { mProgress = progress; // invalidate(); postInvalidate(); } } |
attrs.xml
代码如下 | 复制代码 |
|
本文介绍了Android实现环形进度条代码,实现后效果非常酷炫,大家可以试着把这个环形进度条加进自己的网页。
先上效果图:
自定义控件:AttendanceProgressBar
代码如下:
代码如下 | 复制代码 |
publicclassAttendanceProgressBarextendsView { // 画圆环底部的画笔 privatePaint mCirclePaint; // 画圆环的画笔 privatePaint mRingPaint; // 画字体的画笔 privatePaint mTextPaint; // 圆形颜色 privateintmCircleColor; // 圆环颜色 privateintmRingColor; // 半径 privatefloatmRadius; // 圆环半径 privatefloatmRingRadius; // 圆环宽度 privatefloatmStrokeWidth; // 圆心x坐标 privateintmXCenter; // 圆心y坐标 privateintmYCenter; // 字的长度 privatefloatmTxtWidth; // 字的高度 privatefloatmTxtHeight; // 总进度 privateintmTotalProgress =100; // 当前进度 privateintmProgress =80; //字体颜色 privateintmTextColor; // 字体大小 privatefloatmTextSize;
publicAttendanceProgressBar(Context context, AttributeSet attrs) { super(context, attrs); // 获取自定义的属性 initAttrs(context, attrs); initVariable(); }
privatevoidinitAttrs(Context context, AttributeSet attrs) { TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.AttendanceProgressBar,0,0); mRadius = typeArray.getDimension(R.styleable.AttendanceProgressBar_radius,80); mStrokeWidth = typeArray.getDimension(R.styleable.AttendanceProgressBar_strokeWidth,10); mCircleColor = typeArray.getColor(R.styleable.AttendanceProgressBar_circleColor,0xFFFFFFFF); mRingColor = typeArray.getColor(R.styleable.AttendanceProgressBar_ringColor,0xFFFFFFFF); mTextColor = typeArray.getColor(R.styleable.AttendanceProgressBar_textColor,0xFF000000); mTextSize = typeArray.getDimension(R.styleable.AttendanceProgressBar_textSize,80);
mRingRadius = mRadius + mStrokeWidth /2; }
privatevoidinitVariable() { mCirclePaint =newPaint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setColor(mCircleColor); // mCirclePaint.setStyle(Paint.Style.FILL); mCirclePaint.setStyle(Paint.Style.STROKE); mCirclePaint.setStrokeWidth(mStrokeWidth);
mRingPaint =newPaint(); mRingPaint.setAntiAlias(true); mRingPaint.setColor(mRingColor); mRingPaint.setStyle(Paint.Style.STROKE); mRingPaint.setStrokeWidth(mStrokeWidth);
mTextPaint =newPaint(); mTextPaint.setAntiAlias(true); mTextPaint.setStyle(Paint.Style.FILL); mTextPaint.setColor(mTextColor); // mTextPaint.setARGB(255, 255, 255, 255); // mTextPaint.setTextSize(mRadius / 2); mTextPaint.setTextSize(mTextSize); Paint.FontMetrics fm = mTextPaint.getFontMetrics(); mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);
}
@Override protectedvoidonDraw(Canvas canvas) {
mXCenter = getWidth() /2; mYCenter = getHeight() /2;
// canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);
canvas.drawCircle(mXCenter, mYCenter, mRingRadius, mCirclePaint); RectF oval =newRectF(); oval.left = (mXCenter - mRingRadius); oval.top = (mYCenter - mRingRadius); oval.right = mRingRadius *2+ (mXCenter - mRingRadius); oval.bottom = mRingRadius *2+ (mYCenter - mRingRadius); canvas.drawArc(oval, -90, ((float) mProgress / mTotalProgress) *360,false, mRingPaint);// // canvas.drawCircle(mXCenter, mYCenter, mRadius + mStrokeWidth / 2, mRingPaint); // String txt = mProgress + "%"; String txt ="16/18"; mTxtWidth = mTextPaint.measureText(txt,0, txt.length()); // canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint); canvas.drawText(txt, mXCenter - mTxtWidth /2, mYCenter + mTxtHeight /4- dipToPx(10), mTextPaint); txt ="出勤人数"; mTxtWidth = mTextPaint.measureText(txt,0, txt.length()); canvas.drawText(txt, mXCenter - mTxtWidth /2, mYCenter + mTxtHeight /4+ dipToPx(10), mTextPaint); }
publicvoidsetProgress(intprogress) { mProgress = progress; postInvalidate(); } privateintdipToPx(intdip) { floatscale = getContext().getResources().getDisplayMetrics().density; return(int) (dip * scale +0.5f * (dip >=0?1: -1)); } } |
因为是自定义控件,所以在attr.xml文件定义了一些控件属性,以便在xml文件中设置这些属性
代码如下:
代码如下 | 复制代码 |
< resources > < declare-styleable name = "AttendanceProgressBar" > < attr name = "radius" format = "dimension" /> < attr name = "strokeWidth" format = "dimension" /> < attr name = "circleColor" format = "color" /> < attr name = "ringColor" format = "color" /> < attr name = "textColor" format = "color" /> < attr name = "textSize" format = "dimension" /> </ declare-styleable > </ resources > |
最后,在xml文件中,可以这样使用
代码如下 | 复制代码 |
<com.ztd.lieyi.widget.AttendanceProgressBar android:layout_gravity="center" android:layout_width="100dp" android:layout_height="100dp" app:radius="45dp" app:strokeWidth="5dp" app:textSize="@dimen/text_16" app:textColor="@color/color_333333" app:circleColor="@color/color_d5ebfd" app:ringColor="@color/color_2c9df7"/> |
这只是初步处理,使用时可以根据需求酌情处理。
安卓系统大家都知道各种手机有个子的更新安卓系统的时间,并不像苹果一样统一,那么小编今天就带来了各家厂商跟新Android 7.0的速度比较。感兴趣的朋友戳进来了解一下吧。安卓的开放性,决定了它更新不可能像iOS那样及时,现在外媒汇总了2016年一些安卓手机厂商更新的速度,而这是以Android 7.0为考虑依据的。
升级最快的当属LG,这恐怕是很多人没想到的,谷歌推出Nougat后的78天,他们就给G5进行了升级,在Android 6.0的更新中,LG也是最迅速的,不到2个月就为Sprint版的G4升级了Marshmallow。
其次摩托罗拉的表现也是不错的,Verizon Moto Z和Moto Z Force 11月18日升级到了Nougat,只比谷歌发布Nougat晚了88天,而HTC的表现是,在谷歌发布Nougat 95天后,率先为HTC 10带来了升级,之后的是M9等机型,索尼跟进谷歌的速度也还可以(99天),11月29日将Xperia X Performance升级到了Nougat,随后是Xperia XZ、Xperia X和X Compact。
中国厂商中,小米的表现最迅速,12月26日他们为小米5发布了中文版MIUI 8,比谷歌发布Nougat晚了126天,小米官方表示对于新系统除了要及时跟进外,还要确保发布稳定认真的更新包。
或许是机型太多的缘故,三星在安卓7.0的跟进上慢了不少,历时143天才发布了面向Galaxy S7和S7 Edge的正式版Nougat,而一加比谷歌发布Nougat晚131天,12月31日为一加3、3T发布了稳定版本Nougat更新包。
从更新升级速度上来说,LG、摩托罗拉、HTC和索尼表现都不错,它们都在100天内为设备升级了Nougat,当然小米的跟进速度也很快,毕竟要做更多的本地化适配。除了性价比高外,更新系统更快也是大家入手小米的一个重要原因...