android实现头像更改并保存（调用系统相册，系统相机） _系统相机

千金一刻莫空度，老大无成空自伤。这篇文章主要讲述android实现头像更改并保存（调用系统相册，系统相机）相关的知识，希望能为你提供帮助。
先给大家展示一下效果图：

文章图片

点击头像会弹出对话框，提示选择路径相机，相册
代码如下：

private ImageView iv; iv=findViewById(R.id.imagetouxiang); iv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("获取图片方式"); builder.setItems(new String[]{"拍照", "相册"}, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which){ case 0:break; case 1:break; } } }); builder.create().show(); } });

（当中的点击事件我没写，最后会有补充）

接着是布局页面
（这个我就不写我给的图片中的布局了，给大家只放个图片，用来完成这个案例即可）

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout 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" android:orientation="vertical" tools:context=".AlbumfirstActivity"> < ImageView android:id="@+id/imagetouxiang" android:layout_width="100dp" android:layout_height="100dp" android:layout_gravity="center" /> < /LinearLayout>

还有个重要的是权限，在清单文件（AndroidManifest.xml）中写

< uses-permission android:name="android.permission.CAMERA" /> < uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> < uses-permission android:name="android.permission.BROADCAST_STICKY" /> < uses-permission android:name="android.permission.INTERNET" />

重要的工具类BitmapUtils

package com.example.ablumtest; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; 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; } /*** 该方法用于图片压缩处理,注意width、height参数的类型必须是float* */ 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; } }

还有一个onActivityResult，用来activity做出回应（这里说明一下，我上边的对话框，每一个case都有他对应的事件）
下边我给大家暂时在这写一下

case 0: Intent intent2=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent2,200); break; case 1: Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent,100); break;

protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode==100& & resultCode==RESULT_OK& & data!=null){//系统相册 Uri imageData = https://www.songbingjia.com/android/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); } }

下面给大家贴上完整代码：

package com.example.ablumtest; import androidx.annotation.Nullable; import androidx.annotation.RequiresApi; import androidx.appcompat.app.AppCompatActivity; import android.content.ContentUris; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.provider.DocumentsContract; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ImageView; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class AlbumfirstActivity extends AppCompatActivity {private ImageView iv; //要设置的头像@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_albumfirst); iv=(ImageView) findViewById(R.id.imagetouxiang); iv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(AblumfirstActivity.this); builder.setTitle("获取图片方式"); builder.setItems(new String[]{"拍照", "相册"}, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which){ case 0: Intent intent2=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent2,200); break; case 1: Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent,100); break; } } }); builder.create().show(); } }); }@RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode==100& & resultCode==RESULT_OK& & data!=null){//系统相册 Uri imageData = https://www.songbingjia.com/android/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; } /** * uri路径查询字段 * * @param context * @param uri * @param selection * @param selectionArgs * @return */ 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()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is Google Photos. */ public static boolean isGooglePhotosUri(Uri uri) { return "com.google.android.apps.photos.content".equals(uri.getAuthority()); } /** * 判断本地是否有该图片,没有则去联网请求 * */ @Override protected void onResume() { super.onResume(); if(readImage()){ return; } }}

【android实现头像更改并保存（调用系统相册，系统相机）】