最近做了調(diào)用系統(tǒng)相機(jī)和相冊，在其他博客中看到還有對圖像進(jìn)行剪切，大家都知道，我們在玩微信的時(shí)候，頭像更換是方形圖片，接下來我們就對這種情況具體進(jìn)行描述：

必要的權(quán)限：

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

布局：

<ImageViewandroid:id="@+id/mIcon"android:layout_width="100dp"android:layout_height="100dp"android:layout_margin="10dp"android:src="@mipmap/weixin_fenlei" />

代碼：

在onCreat()方法中：mIcon = (ImageView) findViewById(R.id.mIcon);mIcon.setOnClickListener(this); @Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.mIcon:new AlertDialog.Builder(this).setPositiveButton("相機(jī)", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {//動態(tài)權(quán)限：點(diǎn)擊相機(jī)時(shí)獲取相機(jī)權(quán)限D(zhuǎn)ongTaiShare();//從相機(jī)獲取圖片getPicFromCamera();}}).setNegativeButton("相冊", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {//從相冊獲取圖片getPicFromAlbm();}}).create().show();break;}}//添加動態(tài)權(quán)限private void DongTaiShare() {if (Build.VERSION.SDK_INT >= 23) {String[] mPermissionList = new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.CALL_PHONE, Manifest.permission.READ_LOGS, Manifest.permission.READ_PHONE_STATE, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.SET_DEBUG_APP, Manifest.permission.SYSTEM_ALERT_WINDOW, Manifest.permission.GET_ACCOUNTS, Manifest.permission.WRITE_APN_SETTINGS, Manifest.permission.CAMERA};ActivityCompat.requestPermissions(this, mPermissionList, 123);}}//調(diào)用系統(tǒng)相機(jī)private void getPicFromCamera() {Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(intent, 1);}//調(diào)用相冊private void getPicFromAlbm() {Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);photoPickerIntent.setType("image/*");startActivityForResult(photoPickerIntent, 2);}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent intent) {switch (requestCode) {// 調(diào)用相機(jī)后返回case 1:if (resultCode == RESULT_OK) {final Bitmap photo = intent.getParcelableExtra("data");//給頭像設(shè)置你相機(jī)拍的照片mIcon.setImageBitmap(photo);}break;//調(diào)用相冊后返回case 2:if (resultCode == RESULT_OK) {Uri uri = intent.getData();cropPhoto(uri);//裁剪圖片}break;//調(diào)用剪裁后返回case 3:Bundle bundle = intent.getExtras();if (bundle != null) {//在這里獲得了剪裁后的Bitmap對象，可以用于上傳Bitmap image = bundle.getParcelable("data");//設(shè)置到ImageView上mIcon.setImageBitmap(image);//也可以進(jìn)行一些保存、壓縮等操作后上傳String path = saveImage("userHeader", image);File file = new File(path);/**這里可以做上傳文件的額操作*/}break;}}/*** 裁剪圖片*/private void cropPhoto(Uri uri) {Intent intent = new Intent("com.android.camera.action.CROP");intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);intent.setDataAndType(uri, "image/*");intent.putExtra("crop", "true");intent.putExtra("aspectX", 1);intent.putExtra("aspectY", 1);intent.putExtra("outputX", 300);intent.putExtra("outputY", 300);intent.putExtra("return-data", true);startActivityForResult(intent, 3);}/*** 保存圖片到本地** @param name* @param bmp* @return*/public String saveImage(String name, Bitmap bmp) {File appDir = new File(Environment.getExternalStorageDirectory().getPath());if (!appDir.exists()) {appDir.mkdir();}String fileName = name + ".jpg";File file = new File(appDir, fileName);try {FileOutputStream fos = new FileOutputStream(file);bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);fos.flush();fos.close();return file.getAbsolutePath();} catch (IOException e) {e.printStackTrace();}return null;}

再給大家來幾張效果圖：

這里只是簡單的給大家介紹一個(gè)Android里的小功能，如果有什么不足，或者在使用過程中遇到了什么問題，可以留言，謝謝！

May everyone be happy every day and everything go well!

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