前言，版本兼容问题主要是由于4.4以前和4.4以后的uri的格式不同所造成的错误
1.拍照 和选择图片
①选择图片
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intent = new intent(intent.action_get_content);
intent.settype("image/*");
startactivityforresult(intent, gallery_request_code);
②拍照
intent = new intent(mediastore.action_image_capture);
startactivityforresult(intent, camera_request_code);
2.获取系统传来的值
标记符
private static int camera_request_code = 1;
private static int gallery_request_code = 2;
private static int crop_request_code = 3;
@override
protected void onactivityresult(int requestcode, int resultcode, intent data) {
if (requestcode == camera_request_code) {
if (data == null) {
return;
} else { //拍照
bundle extras = data.getextras();
if (extras != null) {
bitmap bm = extras.getparcelable("data");
uri uri = savebitmap(bm);
startimagezoom(uri);
}
}
} else if (requestcode == gallery_request_code) {
if (data == null) {//相册
return;
}
uri uri;
uri = data.getdata();
uri fileuri = converturi(uri);
startimagezoom(fileuri);
} else if (requestcode == crop_request_code) {
if (data == null) {
return;
}//剪裁后的图片
bundle extras = data.getextras();
if (extras == null) {
return;
}
bitmap bm = extras.getparcelable("data");
showimageview(bm);
}
}
3.图片选取后 根据url 转成流 并保存
private uri converturi(uri uri) {
inputstream is = null;
try {
is = getcontentresolver().openinputstream(uri);
bitmap bitmap = bitmapfactory.decodestream(is);
is.close();
return savebitmap(bitmap);
} catch (filenotfoundexception e) {
e.printstacktrace();
return null;
} catch (ioexception e) {
e.printstacktrace();
return null;
}
}
4.保存图片 记得加权限
private uri savebitmap(bitmap bm) {
file tmpdir = new file(environment.getexternalstoragedirectory()
+ "/xiaoxin");
if (!tmpdir.exists()) {
tmpdir.mkdir();
}
file img = new file(tmpdir.getabsolutepath() + "love.png");
try {
fileoutputstream fos = new fileoutputstream(img);
bm.compress(bitmap.compressformat.png, 85, fos);
fos.flush();
fos.close();
toast.maketext(mainactivity.this, "成功了", toast.length_short).show();
return uri.fromfile(img);
} catch (filenotfoundexception e) {
toast.maketext(mainactivity.this, "失敗了", toast.length_short).show();
e.printstacktrace();
return null;
} catch (ioexception e) {
e.printstacktrace();
toast.maketext(mainactivity.this, "失敗了", toast.length_short).show();
return null;
}
}
5.剪裁图片
/**
* 剪裁图片
*
* @param uri
*/
private void startimagezoom(uri uri) {
intent intent = new intent("com.android.camera.action.crop");
intent.setdataandtype(uri, "image/*");
intent.putextra("crop", "true");
intent.putextra("aspectx", 1);
intent.putextra("aspecty", 1);
intent.putextra("outputx", 150);
intent.putextra("outputy", 150);
intent.putextra("return-data", true);
startactivityforresult(intent, crop_request_code);
}
下面我们再来看一个实例：先是代码的部分，部分是从网路上摘录的，自己整理后当做工具类使用
配置文件：布局很简单，一个imagebutton和一个button，点击都可以实现图像选择的功能，具体的实现根据大家在实际中用的效果而定
—————————————————————————————————————————————————
androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.cogent.piccut"
android:versioncode="1"
android:versionname="1.0" >
<uses-sdk android:minsdkversion="10" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".piccutactivity"
android:screenorientation="portrait" >
<intent-filter >
<action android:name="android.intent.action.main" />
<category android:name="android.intent.category.launcher" />
</intent-filter>
</activity>
</application>
</manifest>
—————————————————————————————————————————————————
java代码：
package com.cogent.piccut;
import java.io.file;
import java.text.simpledateformat;
import java.util.date;
import android.app.activity;
import android.app.alertdialog;
import android.content.dialoginterface;
import android.content.intent;
import android.graphics.bitmap;
import android.graphics.drawable.bitmapdrawable;
import android.graphics.drawable.drawable;
import android.net.uri;
import android.os.bundle;
import android.os.environment;
import android.provider.mediastore;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.imagebutton;
public class piccutactivity extends activity implements onclicklistener {
private imagebutton img_btn;
private button btn;
private static final int photo_request_takephoto = 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
// 创建一个以当前时间为名称的文件
file tempfile = new file(environment.getexternalstoragedirectory(),getphotofilename());
/** called when the activity is first created. */
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
init();
}
//初始化控件
private void init() {
img_btn = (imagebutton) findviewbyid(r.id.img_btn);
btn = (button) findviewbyid(r.id.btn);
//为imagebutton和button添加监听事件
img_btn.setonclicklistener(this);
btn.setonclicklistener(this);
}
//点击事件
@override
public void onclick(view v) {
// todo auto-generated method stub
switch (v.getid()) {
case r.id.img_btn:
showdialog();
break;
case r.id.btn:
showdialog();
break;
}
}
//提示对话框方法
private void showdialog() {
new alertdialog.builder(this)
.settitle("头像设置")
.setpositivebutton("拍照", new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
// todo auto-generated method stub
dialog.dismiss();
// 调用系统的拍照功能
intent intent = new intent(mediastore.action_image_capture);
// 指定调用相机拍照后照片的储存路径
intent.putextra(mediastore.extra_output,uri.fromfile(tempfile));
startactivityforresult(intent, photo_request_takephoto);
}
})
.setnegativebutton("相册", new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
// todo auto-generated method stub
dialog.dismiss();
intent intent = new intent(intent.action_pick, null);
intent.setdataandtype(mediastore.images.media.external_content_uri,"image/*");
startactivityforresult(intent, photo_request_gallery);
}
}).show();
}
@override
protected void onactivityresult(int requestcode, int resultcode, intent data) {
// todo auto-generated method stub
switch (requestcode) {
case photo_request_takephoto:
startphotozoom(uri.fromfile(tempfile), 150);
break;
case photo_request_gallery:
if (data != null)
startphotozoom(data.getdata(), 150);
break;
case photo_request_cut:
if (data != null)
setpictoview(data);
break;
}
super.onactivityresult(requestcode, resultcode, data);
}
private void startphotozoom(uri uri, int size) {
intent intent = new intent("com.android.camera.action.crop");
intent.setdataandtype(uri, "image/*");
// crop为true是设置在开启的intent中设置显示的view可以剪裁
intent.putextra("crop", "true");
// aspectx aspecty 是宽高的比例
intent.putextra("aspectx", 1);
intent.putextra("aspecty", 1);
// outputx,outputy 是剪裁图片的宽高
intent.putextra("outputx", size);
intent.putextra("outputy", size);
intent.putextra("return-data", true);
startactivityforresult(intent, photo_request_cut);
}
//将进行剪裁后的图片显示到ui界面上
private void setpictoview(intent picdata) {
bundle bundle = picdata.getextras();
if (bundle != null) {
bitmap photo = bundle.getparcelable("data");
drawable drawable = new bitmapdrawable(photo);
img_btn.setbackgrounddrawable(drawable);
}
}
// 使用系统当前日期加以调整作为照片的名称
private string getphotofilename() {
date date = new date(system.currenttimemillis());
simpledateformat dateformat = new simpledateformat("'img'_yyyymmdd_hhmmss");
return dateformat.format(date) + ".jpg";
}
}
心得总结：androi系统内部自带了图片的剪裁功能，开发是只要调用即可，intent的很多用法比较实用，但是太多了，需要用到的时候去查询或者平时多看看官方文档，很多代码看着简单但还是要实际自己去写更好些，理解的更深入一些。
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