Android应用中如何将头像保存到本地服务器？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
具体代码如下所述：
public class MainActivity extends AppCompatActivity implements View.OnClickListener { private ImageView iv;//要设置的头像 private Button btn_photo;//调用相册按钮 private Button btn_camera;//调用相机按钮 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iv=(ImageView) findViewById(R.id.iv); btn_photo = (Button) findViewById(R.id.btn_photo); btn_camera = (Button) findViewById(R.id.btn_camera); btn_photo.setOnClickListener(this); btn_camera.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_photo://打开系统相册 Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent,100); break; case R.id.btn_camera://打开系统相机 Intent intent2=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent2,200); break; } } @RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode==100&&resultCode==RESULT_OK&&data!=null){//系统相册 Uri imageData = data.getData(); String path=getPath(imageData); Bitmap bitmap = BitmapFactory.decodeFile(path); Bitmap bitmap1 = BitmapUtils.zoom(bitmap, iv.getWidth(), iv.getHeight()); Bitmap bitmap2 = BitmapUtils.circleBitmap(bitmap1); //加载显示 iv.setImageBitmap(bitmap2); //bitmap图片上传到服务器...... //bitmap图片保存到本地 saveImage(bitmap2); }else if(requestCode==200&&resultCode==RESULT_OK&&data!=null){//系统相机 Bitmap bitmap = (Bitmap) data.getExtras().get("data"); BitmapUtils.zoom(bitmap,iv.getWidth(),iv.getHeight()); bitmap=BitmapUtils.circleBitmap(bitmap); //加载显示 iv.setImageBitmap(bitmap); //bitmap图片上传到服务器...... //bitmap图片保存到本地 saveImage(bitmap); } } private void saveImage(Bitmap bitmap) { File filesDir; if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){//判断sd卡是否挂载 //路径1：storage/sdcard/Android/data/包名/files filesDir = this.getExternalFilesDir(""); }else{//手机内部存储 //路径：data/data/包名/files filesDir = this.getFilesDir(); } FileOutputStream fos = null; try { File file = new File(filesDir,"icon.png"); fos = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.PNG, 100,fos); } catch (FileNotFoundException e) { e.printStackTrace(); }finally{ if(fos != null){ try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } } } //如果本地有,就不需要再去联网去请求 private boolean readImage() { File filesDir; if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){//判断sd卡是否挂载 //路径1：storage/sdcard/Android/data/包名/files filesDir = getExternalFilesDir(""); }else{//手机内部存储 //路径：data/data/包名/files filesDir = getFilesDir(); } File file = new File(filesDir,"icon.png"); if(file.exists()){ //存储--->内存 Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath()); iv.setImageBitmap(bitmap); return true; } return false; } @RequiresApi(api = Build.VERSION_CODES.KITKAT) private String getPath(Uri uri) { int sdkVersion = Build.VERSION.SDK_INT; //高于4.4.2的版本 if (sdkVersion >= 19) { Log.e("TAG", "uri auth: " + uri.getAuthority()); if (isExternalStorageDocument(uri)) { String docId = DocumentsContract.getDocumentId(uri); String[] split = docId.split(":"); String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } } else if (isDownloadsDocument(uri)) { final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(this, contentUri, null, null); } else if (isMediaDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = "_id=?"; final String[] selectionArgs = new String[]{split[1]}; return getDataColumn(this, contentUri, selection, selectionArgs); } else if (isMedia(uri)) { String[] proj = {MediaStore.Images.Media.DATA}; Cursor actualimagecursor = this.managedQuery(uri, proj, null, null, null); int actual_image_column_index = actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); actualimagecursor.moveToFirst(); return actualimagecursor.getString(actual_image_column_index); } } else if ("content".equalsIgnoreCase(uri.getScheme())) { // Return the remote address if (isGooglePhotosUri(uri)) return uri.getLastPathSegment(); return getDataColumn(this, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { return uri.getPath(); } return null; } public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = "_data"; final String[] projection = {column}; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int index = cursor.getColumnIndexOrThrow(column); return cursor.getString(index); } } finally { if (cursor != null) cursor.close(); } return null; } private boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } public static boolean isMedia(Uri uri) { return "media".equals(uri.getAuthority()); } public static boolean isGooglePhotosUri(Uri uri) { return "com.google.android.apps.photos.content".equals(uri.getAuthority()); } @Override protected void onResume() { super.onResume(); if(readImage()){ return; } }}//BitmapUtils工具类public class BitmapUtils { public static Bitmap circleBitmap(Bitmap source){ //默认只对宽进行处理 int width=source.getWidth(); Bitmap bitmap=Bitmap.createBitmap(width,width,Bitmap.Config.ARGB_8888); Canvas canvas=new Canvas(bitmap); Paint paint=new Paint(); //设置抗锯齿 paint.setAntiAlias(true); canvas.drawCircle(width/2,width/2,width/2,paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(source,0,0,paint); return bitmap; } public static Bitmap zoom(Bitmap source,float width,float height){ Matrix matrix=new Matrix(); //图片进行压缩处理 matrix.postScale(width/source.getWidth(),height/source.getHeight()); Bitmap bitmap = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, false); return bitmap; }}看完上述内容，你们掌握Android应用中如何将头像保存到本地服务器的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注编程网行业资讯频道，感谢各位的阅读！
