Android调用系统相机和相册(更换微信头像)

最近做了调用系统相机和相册，在其他博客中看到还有对图像进行剪切，大家都知道，我们在玩微信的时候，头像更换是方形图片，接下来我们就对这种情况具体进行描述：

必要的权限：

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

布局：

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

代码：

在onCreat()方法中：
 mIcon = (ImageView) findViewById(R.id.mIcon);
 mIcon.setOnClickListener(this);

@Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.mIcon:
                new AlertDialog.Builder(this)
                        .setPositiveButton("相机", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                //动态权限：点击相机时获取相机权限
                                DongTaiShare();
                                //从相机获取图片
                                getPicFromCamera();
                            }
                        }).setNegativeButton("相册", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //从相册获取图片
                        getPicFromAlbm();
                    }
                }).create().show();
                break;
        }

    }

    //添加动态权限
    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);
        }
    }

    //调用系统相机
    private void getPicFromCamera() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, 1);
    }

    //调用相册
    private void getPicFromAlbm() {
        Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
        photoPickerIntent.setType("image/*");
        startActivityForResult(photoPickerIntent, 2);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        switch (requestCode) {
            // 调用相机后返回
            case 1:
                if (resultCode == RESULT_OK) {
                    final Bitmap photo = intent.getParcelableExtra("data");
                    //给头像设置你相机拍的照片
                    mIcon.setImageBitmap(photo);

                }
                break;
            //调用相册后返回
            case 2:
                if (resultCode == RESULT_OK) {
                    Uri uri = intent.getData();
                    cropPhoto(uri);//裁剪图片
                }
                break;
            //调用剪裁后返回
            case 3:
                Bundle bundle = intent.getExtras();
                if (bundle != null) {
                    //在这里获得了剪裁后的Bitmap对象，可以用于上传
                    Bitmap image = bundle.getParcelable("data");
                    //设置到ImageView上
                    mIcon.setImageBitmap(image);
                    //也可以进行一些保存、压缩等操作后上传
                    String path = saveImage("userHeader", image);
                    File file = new File(path);
                    /*
                     *这里可以做上传文件的额操作
                     */
                }
                break;
        }
    }

    /**
     * 裁剪图片
     */
    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);
    }

    /**
     * 保存图片到本地
     *
     * @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;
    }

再给大家来几张效果图：

这里只是简单的给大家介绍一个Android里的小功能，如果有什么不足，或者在使用过程中遇到了什么问题，可以留言，谢谢！

May everyone be happy every day and everything go well!