原文地址 https://www.aclihui.com
前言
此次安卓是对于android拍照片后返回到前台的imageView的程序
问题
Android 7.0对于文件的权限报错问题还是一个大问题,尚且有点问题，本程序兼容安卓前面的版本
布局问价（xml文件）
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ImageView android:id="@+id/imageView" android:adjustViewBounds="true" android:layout_gravity="center" android:minWidth="150dip" android:minHeight="150dip" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <Button android:id="@+id/btnPhone" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="相册" /> <Button android:id="@+id/btnTakePicture" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="拍照" /></LinearLayout>Java文件
package com.aclihui.takeaphoto;import java.io.ByteArrayOutputStream;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.Button;import android.widget.ImageView;public class MainActivity extends Activity { private static final int NONE = 0; private static final int PHOTO_GRAPH = 1;// 拍照 private static final int PHOTO_ZOOM = 2; // 缩放 private static final int PHOTO_RESOULT = 3;// 结果 private static final String IMAGE_UNSPECIFIED = "image/*"; private ImageView imageView = null; private Button btnPhone = null; private Button btnTakePicture = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imageView = (ImageView) findViewById(R.id.imageView); btnPhone = (Button) findViewById(R.id.btnPhone); btnPhone.setOnClickListener(onClickListener); btnTakePicture = (Button) findViewById(R.id.btnTakePicture); btnTakePicture.setOnClickListener(onClickListener); } private final View.OnClickListener onClickListener = new View.OnClickListener() { @Override public void onClick(View v) { if(v==btnPhone){ //从相册获取图片 Intent intent = new Intent(Intent.ACTION_PICK, null); intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_UNSPECIFIED); startActivityForResult(intent, PHOTO_ZOOM); }else if(v==btnTakePicture){ //从拍照获取图片 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment .getExternalStorageDirectory(),"temp.jpg"))); startActivityForResult(intent, PHOTO_GRAPH); } } }; @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == NONE) return; // 拍照 if (requestCode == PHOTO_GRAPH) { // 设置文件保存路径 File picture = new File(Environment.getExternalStorageDirectory() + "/temp.jpg"); startPhotoZoom(Uri.fromFile(picture)); } if (data == null) return; // 读取相册缩放图片 if (requestCode == PHOTO_ZOOM) { startPhotoZoom(data.getData()); } // 解决结果 if (requestCode == PHOTO_RESOULT) { Bundle extras = data.getExtras(); if (extras != null) { Bitmap photo = extras.getParcelable("data"); ByteArrayOutputStream stream = new ByteArrayOutputStream(); photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);// (0-100)压缩文件 //此处可以把Bitmap保存到sd卡中，具体请看：http://www.cnblogs.com/linjiqin/archive/2011/12/28/2304940.html imageView.setImageBitmap(photo); //把图片显示在ImageView控件上 } } super.onActivityResult(requestCode, resultCode, data); } public void startPhotoZoom(Uri uri) { Intent intent = new Intent("com.android.camera.action.CROP");//调用Android系统自带的一个图片剪裁页面, intent.setDataAndType(uri, IMAGE_UNSPECIFIED); intent.putExtra("crop", "true");//进行修剪 // aspectX aspectY 是宽高的比例 intent.putExtra("aspectX", 1); intent.putExtra("aspectY", 1); // outputX outputY 是裁剪图片宽高 intent.putExtra("outputX", 300); intent.putExtra("outputY", 500); intent.putExtra("return-data", true); startActivityForResult(intent, PHOTO_RESOULT); }}兼容性问题
兼容性问题是一个很大的问题。对于7.0以下的文件比较好处理。
