做android项目的时候总免不了遇到图片上传功能，虽然就是调用android系统的拍照和相册选择功能，但是总面部了把一大推代码写在activity里，看上去一大推代码头都昏了。不如把这些功能都集成一个控件，以后遇到图片上传功能也不用那么麻烦了。好啦，下面开始上效果图。
</pre><pre name="code" class="java" style="font-size: 11.8181819915771px;">
</pre><pre name="code" class="java" style="font-size: 11.8181819915771px;">
效果图就是这样了，我们看效果图可以分析出大致的功能就是：一个Imageview里默认有一张图片，我们在选择了图片以后右上角有个删除的Imageview，点击以后可以删除选择的图片，那实际上就是一个FrameLayout嘛，好，下面开始贴代码。基本看代码都能看懂了，需要注意的是做了一下图片压缩的处理。因为不做压缩的话一个图片拍下来都是几兆大小，上传完全不可行。
</pre><pre name="code" class="java" style="font-size: 11.8181819915771px;">自定义控件代码
</pre><pre name="code" class="java">
public class ImagePicker extends FrameLayout implements View.OnClickListener {
private SelectType selectType; //选择的类型照相和选择
private Context context;
private ImageView imageView;
private ImageView deleteImageView;
private int imageViewWidth;
private int imageViewHeight;
private boolean hasImage;
private String imagePath;
private File file;
private LinearLayout dialogView;
private AlertDialog dialog;
private int scaleWidth=240;
private int scaleHeight=240;
public void setScale(int width,int height){
this.scaleWidth=width;
this.scaleHeight=height;
}
public ImagePicker(Context context) {
super(context);
this.context=context;
}
public ImagePicker(Context context, AttributeSet attrs) {
super(context, attrs);
this.context=context;
}
public ImagePicker(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.context=context;
}
public boolean hasImage(){
return this.hasImage;
}
public String getImagePath(){
return this.imagePath;
}
public void setImagePath(String path){
File file=new File(path);
if(!file.exists()){
clearImagePicker();
return;
}
Bitmap bitmap=ImageUtils.getInstance().decodeSampledBitmap(file,imageViewWidth,imageViewHeight);
if(bitmap==null){
clearImagePicker();
return;
}
int degree = ImageUtils.getInstance().readPicDegree(path);
if(degree>0){
bitmap=ImageUtils.getInstance().rotateBitmap(degree,bitmap);
}
imageView.setImageBitmap(bitmap);
imagePath=path;
hasImage=true;
deleteImageView.setVisibility(View.VISIBLE);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK&&
requestCode == getId()) {
if(selectType==null){
selectType=SelectType.CAMERA;
}
switch (selectType){
case CAMERA:
onCameraResult(data);
break;
case PHOTO:
onPhotoResult(data);
break;
}
}
}
private void onPhotoResult(Intent data){
Uri originalUri = data.getData();
Cursor cursor = ((Activity)context).managedQuery(originalUri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String path = cursor.getString(column_index);
try {
File tmpFile=compressImage(path);
setImagePath(tmpFile.getPath());
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(context,"压缩图片失败",Toast.LENGTH_SHORT).show();
clearImagePicker();
return;
}
}
private void onCameraResult(Intent data){
try {
File tmpFile=compressImage(file.getPath());
setImagePath(tmpFile.getPath());
file.delete();
file=tmpFile;
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(context,"压缩图片失败",Toast.LENGTH_SHORT).show();
clearImagePicker();
return;
}
}
private File compressImage(String path) throws IOException {
//图片翻转角度
int degree=ImageUtils.getInstance().readPicDegree(path);
//缩放
BitmapFactory.Options newOpts = new BitmapFactory.Options();
newOpts.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path,newOpts);
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
int be = 1;
if (w > h && w > scaleWidth) {
be = newOpts.outWidth / scaleWidth;
} else if (w < h && h > scaleHeight) {
be = newOpts.outHeight / scaleHeight;
}
if (be <= 0){
be = 1;
}
newOpts.inSampleSize = be;
Bitmap bitmap = BitmapFactory.decodeFile(path, newOpts);
if(degree>0){
bitmap=ImageUtils.getInstance().rotateBitmap(degree,bitmap);
}
//压缩
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
int options = 100;
while ( baos.toByteArray().length / 1024>100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩
options -= 10;
baos.reset();
bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos);
}
//保存
String name = new DateFormat().format("yyyyMMddhhmmss", Calendar.getInstance()) + ".jpg";
File file = new File(SDCardUtils.getImageDir(context),name);
FileOutputStream b = new FileOutputStream(file);
baos.writeTo(b);
baos.close();
b.close();
return file;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
imageView=(ImageView)this.findViewById(R.id.ImagePicker_ImageView);
deleteImageView=(ImageView)this.findViewById(R.id.ImagePicker_ImageDelete);
imageView.setOnClickListener(this);
deleteImageView.setOnClickListener(this);
deleteImageView.setVisibility(View.GONE);
dialogView=(LinearLayout)LayoutInflater.from(this.context).inflate(R.layout.image_picker_dialog_layout,null);
dialogView.findViewById(R.id.ImagePicker_PhotoBtn).setOnClickListener(this);
dialogView.findViewById(R.id.ImagePicker_CameraBtn).setOnClickListener(this);
dialogView.findViewById(R.id.ImagePicker_CancelBtn).setOnClickListener(this);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
imageViewWidth=imageView.getWidth();;
imageViewHeight=imageView.getHeight();;
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.ImagePicker_ImageView:
showImagePickerDialog();
break;
case R.id.ImagePicker_ImageDelete:
clearImagePicker();
break;
case R.id.ImagePicker_CameraBtn:
showCameraApp();
break;
case R.id.ImagePicker_PhotoBtn:
showPhotoApp();
break;
case R.id.ImagePicker_CancelBtn:
closeDialog();
break;
}
}
private void closeDialog(){
dialog.dismiss();
dialog=null;
}
private void showImagePickerDialog(){
ViewGroup parent=(ViewGroup)dialogView.getParent();
if(parent!=null){
parent.removeView(dialogView);
}
dialog= new AlertDialog.Builder(context).setTitle("图片选择")
.setView(dialogView).create();
dialog.show();
}
private void showPhotoApp(){
selectType=SelectType.PHOTO;
Intent photoIntent= new Intent(Intent.ACTION_GET_CONTENT);
photoIntent.setType("image/*");
((Activity)context).startActivityForResult(photoIntent, getId());
closeDialog();
}
private void showCameraApp(){
if(!SDCardUtils.hasSDCard()){
Toast.makeText(context,"请插入sd卡",Toast.LENGTH_SHORT).show();
return;
}
String name = new DateFormat().format("yyyyMMddhhmmss", Calendar.getInstance()) + ".jpg";
file = new File(SDCardUtils.getImageDir(context),name);
selectType=SelectType.CAMERA;
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
((Activity)context).startActivityForResult(cameraIntent, getId());
closeDialog();
}
public void clearImagePicker(){
hasImage=false;
imagePath=null;
imageView.setImageResource(R.drawable.image_picker_add);
deleteImageView.setVisibility(View.GONE);
}
enum SelectType{
PHOTO,CAMERA
}
}
</pre><p></p><p>我们的控件布局是这样的。</p><p></p><pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>
<com.example.imageUpload.widget.ImagePicker xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_margin="10dip"
android:id="@+id/ImagePicker_ImageView"
android:layout_gravity="center"
android:src="@drawable/image_picker_add"
android:scaleType="fitXY"/>
<ImageView
android:layout_width="20dip"
android:layout_height="20dip"
android:id="@+id/ImagePicker_ImageDelete"
android:src="@drawable/image_picker_delete"
android:layout_gravity="right|top" />
</com.example.imageUpload.widget.ImagePicker>
下面开始使用吧！在activity的xml文件里面include一下就可以了，布局代码我就不贴了，来看activity里面。我们需要重写一下onActivityResult，
上传文件我们无非就是用到 //imagePicker1.getImagePath();得到图片的路径
//imagePicker1.hasImage();是否有图片。
public class MyActivity extends Activity {
private ImagePicker imagePicker1;
private ImagePicker imagePicker2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imagePicker1 = (ImagePicker)findViewById(R.id.imagePicker1);
imagePicker2 = (ImagePicker)findViewById(R.id.imagePicker2);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
imagePicker1.onActivityResult(requestCode, resultCode, data);
imagePicker2.onActivityResult(requestCode,resultCode,data);
//imagePicker1.getImagePath();
//imagePicker1.hasImage();
}
}