简单的上传头像图片（使用bitmap）

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很多东西，你记得的时候怎么用都没问题，可当你长时间的搁置之后，熟练的使用就没有这么简单了，简单的使用bitmap上传图片的方法。（仅供参考，以防忘记，特此记录）

1.因为方法很简单这个就只activity源码，布局就不贴了

package com.example.updateicon;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;

public class MainActivity extends AppCompatActivity {
    private Button  button;
    protected static final int CHOOSE_PICTURE = 0;
    protected static final int TAKE_PICTURE = 1;
    private static final int CROP_SMALL_PICTURE = 2;
    protected static Uri tempUri;
    private Bitmap photo;
    private ImageView imageView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        button=findViewById(R.id.button);
        imageView=findViewById(R.id.iv_image);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showChoosePicDialog();
            }
        });
    }

    private void showChoosePicDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("设置头像");
        String[] items = {"选择本地照片", "拍照"};
        builder.setNegativeButton("取消", null);
        builder.setItems(items, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                switch (which) {
                    case CHOOSE_PICTURE: // 选择本地照片
                        Intent openAlbumIntent = new Intent(
                                Intent.ACTION_PICK);
                        openAlbumIntent.setType("image/*");
                        startActivityForResult(openAlbumIntent, CHOOSE_PICTURE);
                        break;
                    case TAKE_PICTURE: // 拍照
                        Intent openCameraIntent = new Intent(
                                MediaStore.ACTION_IMAGE_CAPTURE);
                        tempUri = Uri.fromFile(new File(Environment
                                .getExternalStorageDirectory(), "image.jpg"));
                        // 指定照片保存路径（SD卡），image.jpg为一个临时文件，每次拍照后这个图片都会被替换
                        openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, tempUri);
                        startActivityForResult(openCameraIntent, TAKE_PICTURE);
                        break;
                }
            }
        });
        builder.create().show();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) { // 如果返回码是可以用的
            switch (requestCode) {
                case TAKE_PICTURE:
                    startPhotoZoom(tempUri); // 开始对图片进行裁剪处理
                    break;
                case CHOOSE_PICTURE:
                    startPhotoZoom(data.getData()); // 开始对图片进行裁剪处理
                    break;
                case CROP_SMALL_PICTURE:
                    if (data != null) {
                        setImageToView(data); // 让刚才选择裁剪得到的图片显示在界面上
                    }
                    break;
            }
        }
    }

    //裁剪图片的实现
    protected void startPhotoZoom(Uri uri) {
        if (uri == null) {
            Log.i("tag", "The uri is not exist.");
        }
        tempUri = uri;
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        // 设置裁剪
        intent.putExtra("crop", "true");
        // aspectX aspectY 是宽高的比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪图片宽高
        intent.putExtra("outputX", 150);
        intent.putExtra("outputY", 150);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, CROP_SMALL_PICTURE);
    }

    protected void setImageToView(Intent data) {
        Bundle extras = data.getExtras();
        if (extras != null) {
            photo = extras.getParcelable("data");
            photo=transform(photo);
            imageView.setImageBitmap(photo);

        }
    }


    public Bitmap transform(Bitmap source) {
        int size = Math.min(source.getWidth(), source.getHeight());

        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
        if (squaredBitmap != source) {
            source.recycle();
        }

        Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig() != null
                ? source.getConfig() : Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        BitmapShader shader = new BitmapShader(squaredBitmap,
                BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
        paint.setShader(shader);
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);

        squaredBitmap.recycle();
        return bitmap;

    }
}

上效果图：

附上源码地址（仅供参考）：https://download.csdn.net/download/qq_36636969/10480201