android 设置头像以及裁剪功能

在android的开发过程中，经常遇到设置用户头像以及裁剪图像大小的功能。昨天我遇到了设置用户头像的功能，开始不知道怎么搞，在技术群里问也没人回答，就研究了微信、以及4399游戏中心用户设置头像的功能，了解到用户设置图像的过程，就是两步点击设置头像，选择头像资源的来源，相册和相机两个来得到。

闲话说的有点多了，来说说技术点吧。其实也比较简单，就是通过Intent来启动相册或者相机就可以了。

看下效果图：


















启动相册以及相机关键代码：

switch (which) {
case 0:
// 打开相册
Intent intentFromGallery = new Intent();
intentFromGallery.setType("image/*"); // 设置文件类型
intentFromGallery
.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intentFromGallery,
IMAGE_REQUEST_CODE);
break;
case 1:
// 打开相机
Intent intentFromCapture = new Intent(
MediaStore.ACTION_IMAGE_CAPTURE);
// 判断存储卡是否可以用，可用进行存储
if (Tools.hasSdcard()) {

intentFromCapture.putExtra(
MediaStore.EXTRA_OUTPUT,
Uri.fromFile(new File(Environment
.getExternalStorageDirectory(),
IMAGE_FILE_NAME)));
}

startActivityForResult(intentFromCapture,
CAMERA_REQUEST_CODE);
break;
}

打开系统自带的裁剪功能代码：

/**
* 裁剪图片方法实现
*
* @param uri
*/
public void startPhotoZoom(Uri uri) {

Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
// 设置裁剪
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", 320);
intent.putExtra("outputY", 320);
intent.putExtra("return-data", true);
startActivityForResult(intent, 2);
}

完整实现代码如下：

package com.xzw.picture;

import java.io.File;

import com.xzw.utils.Tools;

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.Window;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;

/**
*
* @author XuZhiwei (xuzw13@gmail.com)
* Create at 2012-8-17 上午10:14:40
*/
public class MainActivity extends Activity {
/*组件*/
private RelativeLayout switchAvatar;
private ImageView faceImage;

private String[] items = new String[] { "选择本地图片", "拍照" };
/*头像名称*/
private static final String IMAGE_FILE_NAME = "faceImage.jpg";

/* 请求码*/
private static final int IMAGE_REQUEST_CODE = 0;
private static final int CAMERA_REQUEST_CODE = 1;
private static final int RESULT_REQUEST_CODE = 2;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE); // 去掉标题
setContentView(R.layout.main);
switchAvatar = (RelativeLayout) findViewById(R.id.switch_face_rl);
faceImage = (ImageView) findViewById(R.id.face);
//设置事件监听
switchAvatar.setOnClickListener(listener);
}

private View.OnClickListener listener = new View.OnClickListener() {

@Override
public void onClick(View v) {
showDialog();
}
};
/**
* 显示选择对话框
*/
private void showDialog() {

new AlertDialog.Builder(this)
.setTitle("设置头像")
.setItems(items, new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0:
Intent intentFromGallery = new Intent();
intentFromGallery.setType("image/*"); // 设置文件类型
intentFromGallery
.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intentFromGallery,
IMAGE_REQUEST_CODE);
break;
case 1:

Intent intentFromCapture = new Intent(
MediaStore.ACTION_IMAGE_CAPTURE);
// 判断存储卡是否可以用，可用进行存储
if (Tools.hasSdcard()) {

intentFromCapture.putExtra(
MediaStore.EXTRA_OUTPUT,
Uri.fromFile(new File(Environment
.getExternalStorageDirectory(),
IMAGE_FILE_NAME)));
}

startActivityForResult(intentFromCapture,
CAMERA_REQUEST_CODE);
break;
}
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).show();

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//结果码不等于取消时候 		if (resultCode != RESULT_CANCELED) {
switch (requestCode) {
case IMAGE_REQUEST_CODE:
startPhotoZoom(data.getData());
break;
case CAMERA_REQUEST_CODE:
if (Tools.hasSdcard()) {
File tempFile = new File(
Environment.getExternalStorageDirectory()
+ IMAGE_FILE_NAME);
startPhotoZoom(Uri.fromFile(tempFile));
} else {
Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！",
Toast.LENGTH_LONG).show();
}

break;
case RESULT_REQUEST_CODE:
if (data != null) {
getImageToView(data);
}
break;
}
}
super.onActivityResult(requestCode, resultCode, data);
}

/**
* 裁剪图片方法实现
*
* @param uri
*/
public void startPhotoZoom(Uri uri) {

Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
// 设置裁剪
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", 320);
intent.putExtra("outputY", 320);
intent.putExtra("return-data", true);
startActivityForResult(intent, 2);
}
/**
* 保存裁剪之后的图片数据
*
* @param picdata
*/
private void getImageToView(Intent data) {
Bundle extras = data.getExtras();
if (extras != null) {
Bitmap photo = extras.getParcelable("data");
Drawable drawable = new BitmapDrawable(photo);
faceImage.setImageDrawable(drawable);
}
}

}

还有一个工具类：

package com.xzw.utils;

import android.os.Environment;
/**
*
* @author XuZhiwei (xuzw13@gmail.com)
* Create at 2012-8-17 上午10:14:40
*/
public class Tools {
/**
* 检查是否存在SDCard
* @return
*/
public static boolean hasSdcard(){
String state = Environment.getExternalStorageState();
if(state.equals(Environment.MEDIA_MOUNTED)){
return true;
}else{
return false;
}
}
}

以上就是实现的代码!完整的资源包。
刚刚在51论坛发表了这篇，这里再做个笔记哈。

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