android调用系统相机并剪切照片(个人学习)

最新推荐文章于 2021-05-26 01:06:46 发布

zhao_doubi

最新推荐文章于 2021-05-26 01:06:46 发布

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分类专栏：学习代码文章标签： android调用系

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本文介绍了一个Android应用程序如何调用系统相机拍摄照片，并实现对拍摄的照片进行剪切的功能。具体步骤包括：设置拍照按钮点击事件启动相机，获取照片路径，启动剪切操作，最终展示剪切后的图片。

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4 android调用系统相机并剪切照片

package com.zhao_doubi.photoimage;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private static final int CAMERA_RESULT = 123;
private static final int CAMERA_RESULT_CUT = 234;
private static final int CAMERA_RESULT_CUT_OVER = 345;
private Button photo;
private ImageView img;
private String mPhotoPath;
private File mPhotoFile;
private Uri mPhotSDUrl;

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

    photo = (Button) findViewById(R.id.photo);
    img = (ImageView) findViewById(R.id.photo_img);

    photo.setOnClickListener(this);

}

@Override
public void onClick(View view) {
    if (view.getId() == R.id.photo) {
        try {
            Intent it = new Intent("android.media.action.IMAGE_CAPTURE");
            //保存路径
            mPhotoPath = "mnt/sdcard/DCIM/Camera/" + getPhotoFileName();
            mPhotoFile = new File(mPhotoPath);

            if (!mPhotoFile.exists()){
                mPhotoFile.createNewFile();
            }
                mPhotSDUrl = Uri.fromFile(mPhotoFile);
            it.putExtra(MediaStore.EXTRA_OUTPUT,mPhotSDUrl);
            //照相的图片
            startActivityForResult(it,CAMERA_RESULT);
            //剪切后的图片
            startActivityForResult(it,CAMERA_RESULT_CUT);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    //拍照后照片
    if(requestCode == CAMERA_RESULT){
        Bitmap bitmap = BitmapFactory.decodeFile(mPhotoPath,null);

        img.setImageBitmap(bitmap);
    }
    //剪切照片
    if (requestCode == CAMERA_RESULT_CUT){
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,mPhotSDUrl);
        sendBroadcast(intent);
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Uri systemImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        ContentResolver contentResolver = getContentResolver();
        Cursor cursor = contentResolver.query(systemImageUri, null,
                MediaStore.Images.Media.DISPLAY_NAME + "='"
                        + mPhotoFile.getName() + "'", null, null);
        Uri photoUriInMedia = null;
        if (cursor != null && cursor.getCount() > 0) {
            cursor.moveToLast();
            long id = cursor.getLong(0);
            photoUriInMedia = ContentUris.withAppendedId(systemImageUri, id);
        }
        cursor.close();
        Intent in = new Intent("com.android.camera.action.CROP");
        //需要裁减的图片格式
        in.setDataAndType(photoUriInMedia, "image/*");
        //允许裁减
        in.putExtra("crop", "true");
        //剪裁后ImageView显时图片的宽
        in.putExtra("outputX", 250);
        //剪裁后ImageView显时图片的高
        in.putExtra("outputY", 250);
        //设置剪裁框的宽高比例
        in.putExtra("aspectX", 1);
        in.putExtra("aspectY", 1);
        in.putExtra("return-data", true);
        startActivityForResult(in, CAMERA_RESULT_CUT_OVER);
    }
    //放弃剪切
    if (requestCode == CAMERA_RESULT_CUT_OVER){
        if(data != null){
            Bitmap bitmap = (Bitmap) data.getExtras().get("data");
            img.setImageBitmap(bitmap);

        }
    }
}

public String getPhotoFileName() {
    Date date = new Date(System.currentTimeMillis());
    SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss");
    return dateFormat.format(date) + ".jpg";
}

}