前言

此次安卓是对于android拍照片后返回到前端的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)

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<?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

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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());
}
// 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,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以下的文件比较好解决。