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   源码介绍

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package com.example.heli.choosepictest;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;


public class MainActivity extends Activity {
    public static final int TAKE_PHOTO=1;
    public static final int CROP_PHOTO=2;
    private Button bt1;
    private Button bt2;
    private ImageView imageView;

    private Uri imageUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt1= (Button) findViewById(R.id.take_photo);
        bt2= (Button) findViewById(R.id.choose_from_album);
        imageView= (ImageView) findViewById(R.id.picture);
        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                File outputImage=new File(Environment.getExternalStorageDirectory(),"output_image.jpg");
                if(outputImage.exists()){
                    outputImage.delete();
                }
                try {
                    outputImage.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                imageUri=Uri.fromFile(outputImage);
                Intent intent=new Intent("android.intent.action.GET_CONTENT");
                intent.setType("image/*");
                intent.putExtra("crop", true);
                intent.putExtra("scale", true);
                intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                Log.d("<<<<<<", "到了没？");
                startActivityForResult(intent, CROP_PHOTO);
                Log.d("<<<<<<", "能到这吗？");
            }
        });

        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建File对象，用于存储拍照后的图片
                File outputImage=new File(Environment.getExternalStorageDirectory(),"output_image.jpg");
                if(outputImage.exists()){
                    outputImage.delete();
                }
                try {
                    outputImage.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                imageUri= Uri.fromFile(outputImage);
                Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                startActivityForResult(intent,TAKE_PHOTO);
           }
        });

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode){
            case TAKE_PHOTO:
                if(resultCode==RESULT_OK){
                    Intent intent=new Intent("com.android.camera.action.CROP");
                    intent.setDataAndType(imageUri,"image/*");
                    intent.putExtra("scale", true);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                    startActivityForResult(intent,CROP_PHOTO);//启动剪裁程序
                }
                break;
            case CROP_PHOTO:
                if(resultCode==RESULT_OK){
                    try {
                        Log.d("<<<<<<","我也不知道？");
                        Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                        Log.d("<<<<<<","你会显示什么？");
                        imageView.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
            default:
                break;
        }
    }
}