首页 > 代码库 > android一个上传图片的例子,包括如何终止上传过程，如果在上传的时候更新进度条(一)
android一个上传图片的例子,包括如何终止上传过程，如果在上传的时候更新进度条(一)
先上效果图:
Layout为:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/black"
android:orientation="vertical">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:isScrollContainer="true">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="centerInside"
android:id="@+id/photo_upload_preview_image"
android:layout_centerInParent="true">
</ImageView>
<!-- photo_upload_progress_item的位置跟photo_upload_preview_image是一样的，为了显示photo_upload_preview_image还在loading
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:orientation="horizontal"
android:id="@+id/photo_upload_progress_item"
android:layout_centerInParent="true"
android:visibility="gone">
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="4dp"
android:layout_gravity="center_vertical"
android:visibility="visible"
style="?android:attr/progressBarStyleSmall"
android:indeterminateDrawable="@drawable/progress_bar_drawable">
</ProgressBar>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
android:textColor="@drawable/white"
android:text="正在载入照片...">
</TextView>
</LinearLayout>
</RelativeLayout>
<!-- photo_upload_progress_layout在photo_upload_preview_image的正底下，带有进度条，显示photo_upload_preview_image的上传进度
-->
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/photo_upload_progress_layout"
android:orientation="vertical"
android:background="@drawable/black"
android:visibility="gone">
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="10dp"
android:background="@drawable/upload_photo_progress_bg"
android:layout_marginTop="6dp"
android:layout_marginBottom="6dp"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
android:layout_gravity="center_horizontal"
android:paddingLeft="0dp"
android:paddingRight="0dp"
android:id="@+id/photo_upload_progress_bar_container">
<View
android:layout_width="3dp"
android:layout_height="fill_parent"
android:id="@+id/photo_upload_progress_bar"
android:background="@drawable/upload_photo_progress_bar">
</View>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="6dp"
android:layout_gravity="center_horizontal"
android:text="照片上传中..."
android:textColor="@drawable/white">
</TextView>
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/photo_upload_bottom_bar"
android:orientation="vertical"
android:background="#BFBFBF"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingBottom="4dp"
android:paddingTop="2dp">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/photo_upload_album_layout"
android:paddingTop="5dp"
android:background="#BFBFBF">
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:text="上传至"
android:textSize="16dp"
android:singleLine="true"
android:textColor="@drawable/gray2"
android:gravity="center_vertical"
android:id="@+id/photo_upload_ablum_prompt">
</TextView>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/photo_upload_ablum_prompt"
android:layout_marginLeft="5dp"
android:text="手机相册"
android:textSize="16dp"
android:singleLine="true"
android:gravity="center_vertical"
android:textColor="@drawable/black"
android:id="@+id/photo_upload_ablum_name">
</TextView>
<!-- 在右侧，可以选择专辑
-->
<Button
android:id="@+id/photo_upload_choose_album"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_alignParentRight="true"
android:text="专辑"
android:textColor="@drawable/black"
android:paddingRight="30dp"
android:background="@drawable/location_button">
</Button>
</RelativeLayout>
<!-- 这个在photo_upload_album_layout的下面为位置增加模块
-->
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/photo_upload_location_layout"
android:layout_below="@id/photo_upload_album_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/photo_upload_location_right_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:background="#BFBFBF"
android:paddingTop="5dp"
android:paddingBottom="5dp">
<Button
android:id="@+id/photo_upload_add_gps"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:text="位置"
android:textColor="@drawable/black"
android:paddingRight="30dp"
android:background="@drawable/location_button">
</Button>
</RelativeLayout>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/photo_upload_location_left_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@id/photo_upload_location_right_layout">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="10dp"
android:id="@+id/photo_upload_location_icon"
android:src=http://www.mamicode.com/"@drawable/location">
这里我们是把本地SD根目录下的一张图片，转成Bitmap,再存到要上传的tmp文件夹里面:private class LoadPhotoTask extends AsyncTask<Void, Void, Boolean>{
private Bitmap mLoadedBitmap = null;
protected Boolean doInBackground(Void... params) {
try {
if(mFilePathName.length() > 0){
File file = new File(mFilePathName);
if (!file.exists()) {
return false;
}
BitmapFactory.Options opt = new BitmapFactory.Options();
long fileSize = file.length();
int maxSize = 2*1024 * 1024;
if(fileSize <= maxSize){
opt.inSampleSize = 1;
}else if(fileSize <= maxSize * 4){ <strong>//小于8M</strong>
opt.inSampleSize = 2;
}else{
long times = fileSize / maxSize;
opt.inSampleSize = (int)(Math.log(times) / Math.log(2.0)) + 1; <strong>//Math.log返回以e为底的对数</strong>
}
try{
mLoadedBitmap = BitmapFactory.decodeFile(mFilePathName,opt);<strong>//opt为缩小的倍数</strong>
mUploadFilePathName = SaveBitmapToFile(mLoadedBitmap);
}catch(OutOfMemoryError e){
Toast.makeText(UploadPhotoActivity.this,
getResources().getString(R.string.no_memory_to_view_photo),
Toast.LENGTH_SHORT).show();
UploadPhotoActivity.this.finish();
}
}
return true;
} catch (Exception e) {
Log.e("UploadPhotoActivity", "doInBackground", e);
return false;
}
}
protected void onPostExecute(Boolean result){
try {
showLoadPreviewProgressBar(false);
if(mLoadedBitmap != null){
ImageView IamgePreView = (ImageView)findViewById(R.id.photo_upload_preview_image);
IamgePreView.setImageBitmap(mLoadedBitmap);
}else{
}
mLoadedBitmap = null;
} catch (Exception e) {
Log.e("UploadPhotoActivity", "onPostExecute", e);
}
}
}
private String SaveBitmapToFile(Bitmap bmp){
if (null == bmp) {
return null;
}
String fileName = "upload_tmp.jpg";
<strong>File f = this.getFileStreamPath(fileName);</strong>//data/data/com.example.tianqitongtest/files/upload_tmp.jpg,这个是要上传的文件存的位置
if (f.exists()) {
f.delete();
}
FileOutputStream ostream;
try {
<strong>int targetWidth = 780;
int w = bmp.getWidth();
if (w > targetWidth) {
int h = bmp.getHeight();
int targetHeight = (targetWidth * h) / w;
bmp = Bitmap.createScaledBitmap(bmp, targetWidth, targetHeight,
true);//根据指定宽度和高度来生成一个新的Bitmap
}</strong>
ostream = this.openFileOutput(fileName, MODE_PRIVATE);
bmp.compress(Bitmap.CompressFormat.JPEG, 70, ostream);
ostream.flush();
ostream.close();
ostream = null;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return f.getAbsolutePath();
}
上传的时候需要把键盘收起:private void hideInputMethod(){
View view = getCurrentFocus();
if(view != null){
((InputMethodManager)getSystemService(INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}
}
得到SD卡上的11.jpg的图片路径：private String getStoredPicPath() {
String fileName = "11.jpg";
return Environment.getExternalStorageDirectory()+"/"+fileName;
}
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