Android从本地获取照片以及调用手机拍照功能的方法

本文主要介绍的是从手机中获取照片并且压缩后显示在imageview或者调用手机相机拍照之后压缩显示在imageView中，具有很好的参考意义，同时兼顾了Android7.0对于调用手机相机的设置问题。有需要的可以借鉴一下：

1.XML布局文件代码

<?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>

2.Activity代码

package com.apress.gerber.camera;

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.os.StrictMode;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.ByteArrayOutputStream;
import java.io.File;

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;
private String change_path = "/peoplechanged";
@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);
StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());
builder.detectFileUriExposure();
}
private final View.OnClickListener onClickListener = new View.OnClickLi
4000
stener() {
@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
String filePath = Environment.getExternalStorageDirectory()+change_path;
File localFile = new File(filePath);
if (!localFile.exists()) {
localFile.mkdir();
}
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment.getExternalStorageDirectory()+change_path
,"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
String filePath = Environment.getExternalStorageDirectory()+change_path;
File localFile = new File(filePath);
if (!localFile.exists()) {
localFile.mkdir();
}
File picture = new File(Environment.getExternalStorageDirectory()+change_path
+ "/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());
}
// 处理结果
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
imageView.setImageBitmap(photo); //把图片显示在ImageView控件上
}
}
super.onActivityResult(requestCode, resultCode, data);
}
/**
* 收缩图片
*
* @param uri
*/
public void startPhotoZoom(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, IMAGE_UNSPECIFIED);
intent.putExtra("crop", "true");
// 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);
}
}

在Activity代码的onCreate()函数中加入了以下几行：

// android 7.0系统解决拍照的问题
StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());
builder.detectFileUriExposure();

如果未加这几行，同时手机是Android7.0的话，会提示报错：

android.os.FileUriExposedException: file:///storage/emulated/0/photo.jpeg exposed beyond app through ClipData.Item.getUri()

错误信息如下图所示：



这个错误修改参考的是如下链接：http://blog.csdn.net/qq_23179075/article/details/70314473
这样，复制XML和Activity文件即可运行，实现对手机图片的获取和相机的调用