android 开启本地相册选择图片并返回显示

.java

package com.jerry.crop;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
    private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
    private static final int PHOTO_REQUEST_CUT = 3;// 结果

    private ImageView iv_image;

    /* 头像名称 */
    private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
    private File tempFile;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.iv_image = (ImageView) this.findViewById(R.id.iv_image);
    }

    /*
     * 从相册获取
     */
    public void gallery(View view) {
        // 激活系统图库，选择一张图片
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_GALLERY
        startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
    }

    /*
     * 从相机获取
     */
    public void camera(View view) {
        // 激活相机
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        // 判断存储卡是否可以用，可用进行存储
        if (hasSdcard()) {
            tempFile = new File(Environment.getExternalStorageDirectory(),
                    PHOTO_FILE_NAME);
            // 从文件中创建uri
            Uri uri = Uri.fromFile(tempFile);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        }
        // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA
        startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
    }

    /*
     * 剪切图片
     */
    private void crop(Uri uri) {
        // 裁剪图片意图
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        intent.putExtra("crop", "true");
        // 裁剪框的比例，1：1
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // 裁剪后输出图片的尺寸大小
        intent.putExtra("outputX", 250);
        intent.putExtra("outputY", 250);

        intent.putExtra("outputFormat", "JPEG");// 图片格式
        intent.putExtra("noFaceDetection", true);// 取消人脸识别
        intent.putExtra("return-data", true);
        // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
        startActivityForResult(intent, PHOTO_REQUEST_CUT);
    }

    /*
     * 判断sdcard是否被挂载
     */
    private boolean hasSdcard() {
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            return true;
        } else {
            return false;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == PHOTO_REQUEST_GALLERY) {
            // 从相册返回的数据
            if (data != null) {
                // 得到图片的全路径
                Uri uri = data.getData();
                crop(uri);
            }

        } else if (requestCode == PHOTO_REQUEST_CAREMA) {
            // 从相机返回的数据
            if (hasSdcard()) {
                crop(Uri.fromFile(tempFile));
            } else {
                Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！", 0).show();
            }

        } else if (requestCode == PHOTO_REQUEST_CUT) {
            // 从剪切图片返回的数据
            if (data != null) {
                Bitmap bitmap = data.getParcelableExtra("data");
                this.iv_image.setImageBitmap(bitmap);
            }
            try {
                // 将临时文件删除
                tempFile.delete();
            } catch (Exception e) {
                e.printStackTrace();
            }

        }

        super.onActivityResult(requestCode, resultCode, data);
    }
}

.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="gallery"
        android:text="获取图库图片" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="camera"
        android:text="拍照获取图片" />

    <ImageView
        android:id="@+id/iv_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

效果图：