调用系统相机拍照，保存照片，调用系统裁剪API对照片处理，显示裁剪之后的照片

package com.pingyijinren.test;

import android.annotation.TargetApi;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.ContentResolver;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.net.Uri;

import android.os.Build;

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;

import java.io.FileNotFoundException;

public class MainActivity extends AppCompatActivity{

    private Button button;

    private ImageView imageView;

    private Uri uri;

    private File file;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button=(Button)findViewById(R.id.button);

        imageView=(ImageView)findViewById(R.id.imageView);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                file=null;

                try{

                    file=new File(Environment.getExternalStorageDirectory()+"/test.jpg");

                    if(file.exists()){

                        file.delete();

                    }

                    file.createNewFile();

                    uri= Uri.fromFile(file);

                    Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");

                    intent.putExtra(MediaStore.EXTRA_OUTPUT,uri);

                    startActivityForResult(intent, 1);

                }

                catch(Exception e){}

            }

        });

    }

    @Override

    protected void onActivityResult(int requestCode,int resultCode,Intent data){

        if(requestCode==1){

            Intent cropIntent=new Intent("com.android.camera.action.CROP");

            cropIntent.setDataAndType(uri,"image/*");

            cropIntent.putExtra("scale",true);

            cropIntent.putExtra(MediaStore.EXTRA_OUTPUT,uri);

            startActivityForResult(cropIntent,2);

        }

        else if(requestCode==2){

            try{

                Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));

                imageView.setImageBitmap(bitmap);

            }

            catch(Exception e){}

        }

    }

}