因為項目中需要用到頭像上傳的功能，所以就下個Ddmo先來實現下。
demo我是類似仿微信的，在一個GridView中展示所有的圖片，其中第一個item可以去照相；獲取到圖片后再進行剪切。
圖片的剪切是從網上找的感覺不錯就用，暫時也沒有測試。
獲取圖片可以用：https://github.com/lovetuzitong/MultiImageSelector來實現
這里的圓形圖像是用https://github.com/hdodenhof/CircleImageView來實現的
Demo寫的比較粗糙，效果只是在4.4的手機和7.0的模擬器跑了一遍，所以可能會出現問題的。
如下是demo的效果圖：
如下是選擇圖片中的代碼
通過LoaderManager來獲取到所有的圖片，然后第一個進行拍照的處理
package com.item.demo.photo.activity;import android/204687.html">android.Manifest;import android.app.LoaderManager;import android.content.ContentResolver;import android.content.Context;import android.content.CursorLoader;import android.content.Intent;import android.content.Loader;import android.content.pm.PackageManager;import android.database.Cursor;import android.net.Uri;import android.os.Build;import android.os.Environment;import android.provider.MediaStore;import android.support.annotation.NonNull;import android.support.v4.content.ContextCompat;import android.support.v4.content.FileProvider;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.GridView;import android.widget.ImageView;import com.item.demo.photo.BuildConfig;import com.item.demo.photo.R;import com.item.demo.photo.adapter.MyPhotoAdapter;import com.item.demo.photo.uilts.Image;import java.io.File;import java.util.ArrayList;import java.util.List;/** * 圖片選擇界面 */public class MyPhotoActivity extends AppCompatActivity { private static final int REQUEST_CAPTURE = 100; //private static final int REQUEST_PICK = 101; private static final int REQUEST_CROP_PHOTO = 102; public static final int FINSH_RESULT = 104;//截圖后的返回 private static final int LOADER_ID = 0x0100; private LoadCallBack mLoad = new LoadCallBack(); private MyPhotoAdapter mAdapter; private List<Image> images = new ArrayList<>(); //調用照相機返回圖片文件 private File tempFile; private static final int MIN_IMAGE_FILE_SIZE = 10 * 1024; // 最小的圖片大小 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my_photo); GridView gv_photo = (GridView)findViewById(R.id.gv_photo); ImageView img_back = (ImageView)findViewById(R.id.iv_back); images.add(new Image()); mAdapter = new MyPhotoAdapter(this,images); gv_photo.setAdapter(mAdapter); gv_photo.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { if(i == 0){ //第一個就去照相 if(hasPermission(new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE})){ gotoCamera(); }else { requestPermission(0x02,new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE}); } }else { //這里點擊獲取到圖片地址然后裁剪 gotoClipActivity(Uri.parse(images.get(i).getPath())); } } }); img_back.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { finish(); } }); } @Override protected void onStart() { super.onStart(); if(hasPermission(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE})){ getLoaderManager().initLoader(LOADER_ID,null,mLoad); }else { requestPermission(0x01,new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}); } } private class LoadCallBack implements LoaderManager.LoaderCallbacks<Cursor>{ private final String[] IMAGE_PROJECTION = new String[]{ MediaStore.Images.Media._ID,//Id MediaStore.Images.Media.DATA,//圖片路徑 MediaStore.Images.Media.DATE_ADDED//圖片的創建時間 }; @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { //創建一個Loader if(id == LOADER_ID){ //如果是我們的ID則進行初始化 return new CursorLoader(getBaseContext(), MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_PROJECTION, null, null, IMAGE_PROJECTION[2] + " DESC"); } return null; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { //當Loader加載完成時 List<Image> images = new ArrayList<>(); //判斷是否有數據 if(data != null){ int count = data.getCount(); if(count > 0){ data.moveToFirst(); // 得到對應的列的Index坐標 int indexId = data.getColumnIndexOrThrow(IMAGE_PROJECTION[0]); int indexPath = data.getColumnIndexOrThrow(IMAGE_PROJECTION[1]); int indexDate = data.getColumnIndexOrThrow(IMAGE_PROJECTION[2]); do { // 循環讀取，直到沒有下一條數據 int id = data.getInt(indexId); String path = data.getString(indexPath); long dateTime = data.getLong(indexDate); File file = new File(path); if (!file.exists() || file.length() < MIN_IMAGE_FILE_SIZE) { // 如果沒有圖片，或者圖片大小太小，則跳過 continue; } // 添加一條新的數據 Image image = new Image(); image.setId(id); image.setPath(path); image.setDate(dateTime); images.add(image); } while (data.moveToNext()); } } updateSource(images); } @Override public void onLoaderReset(Loader<Cursor> loader) { updateSource(null); } } /** * 通知Adapter數據更改的方法 * @param images 新的數據 */ private void updateSource(List<Image> images){ this.images.clear(); this.images.add(new Image()); if(images == null || images.size() == 0) return; this.images.addAll(images); mAdapter.notifyDataSetChanged(); } /** *權限的返回 */ @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); switch(requestCode){ case 0x02: if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){ gotoCamera(); } break; case 0x01: if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){ getLoaderManager().initLoader(LOADER_ID,null,mLoad); } } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); switch (requestCode){ case REQUEST_CAPTURE://系統相機返回 if(resultCode == RESULT_OK){ Log.d("jiejie","--------相機---------" + Uri.fromFile(tempFile).toString()); Log.d("jiejie","--------path----------" + getRealFilePathFromUri(MyPhotoActivity.this,Uri.fromFile(tempFile))); gotoClipActivity(Uri.fromFile(tempFile)); } break; case REQUEST_CROP_PHOTO: if(resultCode == RESULT_OK){ if(data != null){ Uri uri = data.getData(); Log.d("jiejie","-------------" + data.getData().getPath()); String cropImagePath = getRealFilePathFromUri(MyPhotoActivity.this,uri); Log.d("jiejie","------crop--------" + cropImagePath); Intent intent = new Intent(); intent.putExtra("image",cropImagePath); setResult(FINSH_RESULT,intent); MyPhotoActivity.this.finish(); } } break; } } /** * 跳轉到系統照相機 */ private void gotoCamera(){ String SDState = Environment.getExternalStorageState(); //判斷SD卡是否存在 if(SDState.equals(Environment.MEDIA_MOUNTED)){ tempFile = new File(checkDirPath(Environment.getExternalStorageDirectory().getPath()+ "/image/"), System.currentTimeMillis() + ".jpg"); //隱式的打開調用系統相冊 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){ intent.setFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION); //如果是7.0及以上的系統使用FileProvider的方式創建一個Uri Uri contentUri = FileProvider.getUriForFile(MyPhotoActivity.this, BuildConfig.APPLICATION_ID + ".fileProvider", tempFile); intent.putExtra(MediaStore.EXTRA_OUTPUT, contentUri); }else { intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(tempFile)); } startActivityForResult(intent,REQUEST_CAPTURE); } } /** * 打開截圖的界面 * @param uri */ private void gotoClipActivity(Uri uri){ if(uri == null){ return; } Intent intent = new Intent(this,ClipImageActivity.class); intent.putExtra("type",1); intent.setData(uri); startActivityForResult(intent,REQUEST_CROP_PHOTO); } /** * 檢查文件是否存在 */ private static String checkDirPath(String dirPath) { if (TextUtils.isEmpty(dirPath)) { return ""; } File dir = new File(dirPath); if (!dir.exists()) { dir.mkdirs(); } return dirPath; } /** * 判斷是否有指定的權限 */ public boolean hasPermission(String... permissions) { for (String permisson : permissions) { if (ContextCompat.checkSelfPermission(this, permisson) != PackageManager.PERMISSION_GRANTED) { return false; } } return true; } /** * 申請指定的權限. */ public void requestPermission(int code, String... permissions) { if (Build.VERSION.SDK_INT >= 23) { requestPermissions(permissions, code); } } /** * 根據Uri返回文件絕對路徑 * 兼容了file:///開頭的 和 content://開頭的情況 */ public static String getRealFilePathFromUri(final Context context, final Uri uri) { if (null == uri) return null; final String scheme = uri.getScheme(); String data = null; if (scheme == null) data = uri.getPath(); else if (ContentResolver.SCHEME_FILE.equals(scheme)) { data = uri.getPath(); } else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) { Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.ImageColumns.DATA}, null, null, null); if (null != cursor) { if (cursor.moveToFirst()) { int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); if (index > -1) { data = cursor.getString(index); } } cursor.close(); } } return data; }}其中處理動態的權限還需要添加7.0的照相處理
在清單文件中加如下配置：
<provider android:name="android.support.v4.content.FileProvider" android:authorities="com.item.demo.photo.fileProvider" android:grantUriPermissions="true" android:exported="false"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths" /> </provider>
圖片的剪切
package com.item.demo.photo.activity;import android.content.Intent;import android.graphics.Bitmap;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.ImageView;import android.widget.TextView;import com.item.demo.photo.R;import com.item.demo.photo.view.ClipViewLayout;import java.io.File;import java.io.IOException;import java.io.OutputStream;/** * 圖片剪切 */public class ClipImageActivity extends AppCompatActivity implements View.OnClickListener { private ClipViewLayout clipViewLayout1; private ClipViewLayout clipViewLayout2; private ImageView back; private TextView tv_ok; //類別 1：圓形 2：方形 private int type; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_clip_image); type = getIntent().getIntExtra("type",1); initView(); } private void initView() { clipViewLayout1 = (ClipViewLayout)findViewById(R.id.clipViewLayout1); clipViewLayout2 = (ClipViewLayout)findViewById(R.id.clipViewLayout2); back = (ImageView)findViewById(R.id.iv_back); tv_ok = (TextView)findViewById(R.id.tv_ok); back.setOnClickListener(this); tv_ok.setOnClickListener(this); } @Override protected void onResume() { super.onResume(); if(type == 1){ clipViewLayout1.setVisibility(View.VISIBLE); clipViewLayout2.setVisibility(View.GONE); //設置圖片資源 clipViewLayout1.setImageSrc(getIntent().getData()); }else { clipViewLayout2.setVisibility(View.VISIBLE); clipViewLayout1.setVisibility(View.GONE); clipViewLayout2.setImageSrc(getIntent().getData()); } } @Override public void onClick(View view) { switch (view.getId()){ case R.id.iv_back: finish(); break; case R.id.tv_ok: generateUriAndReturn(); break; } } /** * 生成Uri并且通過setResult返回給打開的Activity */ private void generateUriAndReturn() { //調用返回剪切圖 Bitmap zoomedCropBitmap; if (type == 1) { zoomedCropBitmap = clipViewLayout1.clip(); } else { zoomedCropBitmap = clipViewLayout2.clip(); } if (zoomedCropBitmap == null) { Log.e("android", "zoomedCropBitmap == null"); return; } Uri mSaveUri = Uri.fromFile(new File(getCacheDir(), "cropped_" + System.currentTimeMillis() + ".jpg")); if (mSaveUri != null) { OutputStream outputStream = null; try { outputStream = getContentResolver().openOutputStream(mSaveUri); if (outputStream != null) { zoomedCropBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream); } } catch (IOException ex) { Log.e("android", "Cannot open file: " + mSaveUri, ex); } finally { if (outputStream != null) { try { outputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } Intent intent = new Intent(); intent.setData(mSaveUri); setResult(RESULT_OK, intent); finish(); } }}總結
以上所述是小編給大家介紹的Android頭像上傳功能的實現代碼（獲取頭像加剪切），希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對VEVB武林網網站的支持！
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