Android图片上传之选择图片裁剪图片

随笔

最近在做的一个项目中有用到从图库中选择图片，然后进行裁剪后再使用的功能，在这里也简单的记录下整个实现的过程，以备后查。

首先来看看布局文件，非常的简单，两个按钮，一个ImageView.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"
              android:padding="16dp">

    <Button
        android:id="@+id/take_photo_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:gravity="center"
        android:text="拍照"
        android:textSize="16sp"/>

    <Button
        android:id="@+id/select_photo_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:gravity="center"
        android:text="选择图片"
        android:textSize="16sp"/>

    <ImageView
        android:id="@+id/photo_iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"/>
</LinearLayout>

然后再来看看代码部分

package com.example.goblit.selectpic;

import android.app.Activity;
import android.content.ContentValues;
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.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;

public class SelectPicActivity extends Activity implements View.OnClickListener {
    private Button take_photo_btn;
    private Button select_photo_btn;
    private ImageView photo_iv;
    //使用照相机拍照获取图片
    public static final int TAKE_PHOTO_CODE = 1;
    //使用相册中的图片
    public static final int SELECT_PIC_CODE = 2;
    //图片裁剪
    private static final int PHOTO_CROP_CODE = 3;
    //定义图片的Uri
    private Uri photoUri;
    //图片文件路径
    private String picPath;

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

    private void initViews() {
        this.take_photo_btn = (Button) findViewById(R.id.take_photo_btn);
        this.take_photo_btn.setOnClickListener(this);
        this.select_photo_btn = (Button) findViewById(R.id.select_photo_btn);
        this.select_photo_btn.setOnClickListener(this);
        this.photo_iv = (ImageView) findViewById(R.id.photo_iv);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            //拍照
            case R.id.take_photo_btn:
                picTyTakePhoto();
                break;
            //选择图库
            case R.id.select_photo_btn:
                pickPhoto();
                break;
        }
    }

    /**
     * 拍照获取图片
     */
    private void picTyTakePhoto() {
        //判断SD卡是否存在
        String SDState = Environment.getExternalStorageState();
        if (SDState.equals(Environment.MEDIA_MOUNTED)) {
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//"android.media.action.IMAGE_CAPTURE"
            /***
             * 使用照相机拍照，拍照后的图片会存放在相册中。使用这种方式好处就是：获取的图片是拍照后的原图，
             * 如果不使用ContentValues存放照片路径的话，拍照后获取的图片为缩略图有可能不清晰
             */
            ContentValues values = new ContentValues();
            photoUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
            intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, photoUri);
            startActivityForResult(intent, TAKE_PHOTO_CODE);
        } else {
            Toast.makeText(this, "内存卡不存在", Toast.LENGTH_LONG).show();
        }
    }

    /***
     * 从相册中取图片
     */
    private void pickPhoto() {
        Intent intent = new Intent(Intent.ACTION_PICK, null);
        intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                "image/*");
        startActivityForResult(intent, SELECT_PIC_CODE);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            //从相册取图片，有些手机有异常情况，请注意
            if (requestCode == SELECT_PIC_CODE) {
                if (null != data && null != data.getData()) {
                    photoUri = data.getData();
                    picPath = uriToFilePath(photoUri);
                    startPhotoZoom(photoUri, PHOTO_CROP_CODE);
                } else {
                    Toast.makeText(this, "图片选择失败", Toast.LENGTH_LONG).show();
                }
            } else if (requestCode == TAKE_PHOTO_CODE) {
                String[] pojo = {MediaStore.Images.Media.DATA};
                Cursor cursor = managedQuery(photoUri, pojo, null, null, null);
                if (cursor != null) {
                    int columnIndex = cursor.getColumnIndexOrThrow(pojo[0]);
                    cursor.moveToFirst();
                    picPath = cursor.getString(columnIndex);
                    if (Build.VERSION.SDK_INT < 14) {
                        cursor.close();
                    }
                }
                if (picPath != null) {
                    photoUri = Uri.fromFile(new File(picPath));
                    startPhotoZoom(photoUri, PHOTO_CROP_CODE);
                } else {
                    Toast.makeText(this, "图片选择失败", Toast.LENGTH_LONG).show();
                }
            } else if (requestCode == PHOTO_CROP_CODE) {
                if (photoUri != null) {
                    Bitmap bitmap = BitmapFactory.decodeFile(picPath);
                    if (bitmap != null) {
                        //这里可以把图片进行上传到服务器操作
                        photo_iv.setImageBitmap(bitmap);
                    }
                }
            }
        }
    }

    private void startPhotoZoom(Uri uri, int REQUE_CODE_CROP) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        // crop=true是设置在开启的Intent中设置显示的VIEW可裁剪
        intent.putExtra("crop", "true");
        // 去黑边
        intent.putExtra("scale", true);
        intent.putExtra("scaleUpIfNeeded", true);
        // aspectX aspectY 是宽高的比例，根据自己情况修改
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪图片宽高像素
        intent.putExtra("outputX", 100);
        intent.putExtra("outputY", 100);
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
        //取消人脸识别功能
        intent.putExtra("noFaceDetection", true);
        //设置返回的uri
        intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        //设置为不返回数据
        intent.putExtra("return-data", false);
        startActivityForResult(intent, REQUE_CODE_CROP);
    }

    private String uriToFilePath(Uri uri) {
        //获取图片数据
        String[] proj = {MediaStore.Images.Media.DATA};
        //查询
        Cursor cursor = managedQuery(uri, proj, null, null, null);
        //获得用户选择的图片的索引值
        int image_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        //返回图片路径
        return cursor.getString(image_index);
    }
}

整个选择图片并且裁剪的demo就写好了，其实是非常的简单。