Android获取本地相册图片拍照获取图片 _android

赋料扬雄敌，诗看子建亲。这篇文章主要讲述Android获取本地相册图片拍照获取图片相关的知识，希望能为你提供帮助。
需求：从本地相册找图片，或通过调用系统相机拍照得到图片。
容易出错的地方：
1，当我们指定了照片的uri路径，我们就不能通过data.getData(); 来获取uri，而应该直接拿到uri(用全局变量或者其他方式)然后设置给imageView
imageView.setImageURI(uri);
2，我发现手机前置摄像头拍出来的照片只有几百KB，直接用imageView.setImageURI(uri); 没有很大问题，但是后置摄像头拍出来的照片比较大，这个时候使用imageView.setImageURI(uri); 就容易出现 out of memory（oom）错误，我们需要先把URI转换为Bitmap,再压缩bitmap，然后通过imageView.setImageBitmap(bitmap); 来显示图片。
3，将照片存放到SD卡中后，照片不能立即出现在系统相册中，因此我们需要发送广播去提醒相册更新照片。
4，这里用到了sharepreference，要注意用完之后移除缓存。
代码：
MainActivity:

package com.sctu.edu.test;

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

import com.sctu.edu.test.tools.ImageTools;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity {

private static final int PHOTO_FROM_GALLERY = 1;
private static final int PHOTO_FROM_CAMERA = 2;
private ImageView imageView;
private File appDir;
private Uri uriForCamera;
private Date date;
private String str = "";
private SharePreference sharePreference;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Android不推荐使用全局变量，我在这里使用了sharePreference
sharePreference = SharePreference.getInstance(this);
imageView = (ImageView) findViewById(R.id.imageView);
}

//从相册取图片
public void gallery(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, PHOTO_FROM_GALLERY);
}

//拍照取图片
public void camera(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

uriForCamera = Uri.fromFile(createImageStoragePath());
sharePreference.setCache("uri", String.valueOf(uriForCamera));

/**
*指定了uri路径，startActivityForResult不返回intent，
*所以在onActivityResult()中不能通过data.getData()获取到uri;
*/
intent.putExtra(MediaStore.EXTRA_OUTPUT, uriForCamera);
startActivityForResult(intent, PHOTO_FROM_CAMERA);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//第一层switch
switch (requestCode) {
case PHOTO_FROM_GALLERY:
//第二层switch
switch (resultCode) {
case RESULT_OK:
if (data != null) {
Uri uri = data.getData();
imageView.setImageURI(uri);
}
break;
case RESULT_CANCELED:
break;
}
break;
case PHOTO_FROM_CAMERA:
if (resultCode == RESULT_OK) {
Uri uri = Uri.parse(sharePreference.getString("uri"));
updateDCIM(uri);
try {
//把URI转换为Bitmap，并将bitmap压缩，防止OOM(out of memory)
Bitmap bitmap = ImageTools.getBitmapFromUri(uri, this);
imageView.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}

removeCache("uri");
} else {
Log.e("result", "is not ok" + resultCode);
}
break;
default:
break;
}
}

/**
* 设置相片存放路径，先将照片存放到SD卡中，再操作
*
* @return
*/
private File createImageStoragePath() {
if (hasSdcard()) {
appDir = new File("/sdcard/testImage/");
if (!appDir.exists()) {
appDir.mkdirs();
}
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
date = new Date();
str = simpleDateFormat.format(date);
String fileName = str + ".jpg";
File file = new File(appDir, fileName);
return file;
} else {
Log.e("sd", "is not load");
return null;
}
}

/**
* 将照片插入系统相册，提醒相册更新
*
* @param uri
*/
private void updateDCIM(Uri uri) {
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(uri);
this.sendBroadcast(intent);

Bitmap bitmap = BitmapFactory.decodeFile(uri.getPath());
MediaStore.Images.Media.insertImage(getContentResolver(), bitmap, "", "");
}

/**
* 判断SD卡是否可用
*
* @return
*/
private boolean hasSdcard() {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return true;
} else {
return false;
}
}

/**
* 移除缓存
*
* @param cache
*/
private void removeCache(String cache) {
if (sharePreference.ifHaveShare(cache)) {
sharePreference.removeOneCache(cache);
} else {
Log.e("this cache", "is not exist.");
}
}

}

ImageTools:

package com.sctu.edu.test.tools;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

public class ImageTools {

/**
* 通过uri获取图片并进行压缩
*
* @param uri
* @param activity
* @return
* @throws IOException
*/
public static Bitmap getBitmapFromUri(Uri uri, Activity activity) throws IOException {
InputStream inputStream = activity.getContentResolver().openInputStream(uri);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
options.inDither = true;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
BitmapFactory.decodeStream(inputStream, null, options);
inputStream.close();

int originalWidth = options.outWidth;
int originalHeight = options.outHeight;
if (originalWidth == -1 || originalHeight == -1) {
return null;
}

float height = 800f;
float width = 480f;
int be = 1; //be=1表示不缩放
if (originalWidth > originalHeight & & originalWidth > width) {
be = (int) (originalWidth / width);
} else if (originalWidth < originalHeight & & originalHeight > height) {
be = (int) (originalHeight / height);
}

if (be < = 0) {
be = 1;
}
BitmapFactory.Options bitmapOptinos = new BitmapFactory.Options();
bitmapOptinos.inSampleSize = be;
bitmapOptinos.inDither = true;
bitmapOptinos.inPreferredConfig = Bitmap.Config.ARGB_8888;
inputStream = activity.getContentResolver().openInputStream(uri);

Bitmap bitmap = BitmapFactory.decodeStream(inputStream, null, bitmapOptinos);
inputStream.close();

return compressImage(bitmap);
}

/**
* 质量压缩方法
*
* @param bitmap
* @return
*/
public static Bitmap compressImage(Bitmap bitmap) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
int options = 100;
while (byteArrayOutputStream.toByteArray().length / 1024 > 100) {
byteArrayOutputStream.reset();
//第一个参数：图片格式，第二个参数：图片质量，100为最高，0为最差，第三个参数：保存压缩后的数据的流
bitmap.compress(Bitmap.CompressFormat.JPEG, options, byteArrayOutputStream);
options -= 10;
}
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
Bitmap bitmapImage = BitmapFactory.decodeStream(byteArrayInputStream, null, null);
return bitmapImage;
}
}

AndroidMainfest.xml:

< ?xml version="1.0" encoding="utf-8"?>
< manifest package="com.sctu.edu.test"
xmlns:android="http://schemas.android.com/apk/res/android">
< uses-feature
android:name="android.hardware.camera"
android:required="true"
/>

< uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
< uses-permission android:name="android.permission.CAMERA"/>
< uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
< uses-permission android:name="com.miui.whetstone.permission.ACCESS_PROVIDER"/>
< uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
< uses-feature android:name="android.hardware.camera.autofocus" />

< application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
< activity android:name=".MainActivity">
< intent-filter>
< action android:name="android.intent.action.MAIN"/>

< category android:name="android.intent.category.LAUNCHER"/>
< /intent-filter>
< /activity>
< /application>

< /manifest>

activity_main.xml:

< ?xml version="1.0" encoding="utf-8"?>
< 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:background="#fff"
android:orientation="vertical"
tools:context="com.sctu.edu.test.MainActivity">

< Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="从图库找图片"
android:id="@+id/gallery"
android:onClick="gallery"
android:background="#ccc"
android:textSize="20sp"
android:padding="10dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="40dp"
/>

< Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="拍照获取图片"
android:id="@+id/camera"
android:onClick="camera"
android:background="#ccc"
android:textSize="20sp"
android:padding="10dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="40dp"
/>

< ImageView
android:layout_width="300dp"
android:layout_height="300dp"
android:id="@+id/imageView"
android:scaleType="fitXY"
android:background="@mipmap/ic_launcher"
android:layout_marginTop="40dp"
android:layout_marginLeft="30dp"
/>

< /LinearLayout>