Android中设置用户的头像

在开发中我们经常会遇到为用户设置自定义头像的功能，下面我介绍一下如何实现这一功能：



具体代码如下：

package com.example.seticon;

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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

private Button mFromAlbum; // 从相册选取
private Button mTakePhotos; // 照相
private ImageView mImgView;
private final int FROM_ALBUM = 0;
private final int FROM_TAKE_PHOTOS = 1;
private final int PHOTO_CUT = 2;
private final String FILE_NAME = "tempimg.jpg";
private File tempFile;
private Bitmap bitmap;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mImgView = (ImageView) findViewById(R.id.img);
mFromAlbum = (Button) findViewById(R.id.fromAlbum);
mTakePhotos = (Button) findViewById(R.id.takePhoto);
//从相册选取照片
mFromAlbum.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, FROM_ALBUM);
}
});
//即时拍摄头像
mTakePhotos.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
// 判断存储卡是否可以用，可用进行存储
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri
.fromFile(new File(Environment
.getExternalStorageDirectory(), FILE_NAME)));
}
startActivityForResult(intent, FROM_TAKE_PHOTOS);
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
switch (requestCode) {
case FROM_ALBUM:
if (data != null) {
// 取到照片路径
Uri uri = data.getData();
editPic(uri);
}
break;
case FROM_TAKE_PHOTOS:
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
tempFile = new File(Environment.getExternalStorageDirectory(),
FILE_NAME);
editPic(Uri.fromFile(tempFile));
} else {
Toast.makeText(MainActivity.this, "未找到存储卡！", 0).show();
}
break;
case PHOTO_CUT:
try {
bitmap = data.getParcelableExtra("data");
mImgView.setImageBitmap(bitmap);
//删除缓存图片
tempFile.delete();
} catch (Exception e) {
e.printStackTrace();
}
break;
}
super.onActivityResult(requestCode, resultCode, data);

}

/** 编辑选中的照片 */
private void editPic(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri,
4000
"image/*");
intent.putExtra("crop", "true");
// 裁剪框的比例，1：1
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// 裁剪后输出图片的尺寸大小
intent.putExtra("outputX", 250);
intent.putExtra("outputY", 250);
intent.putExtra("outputFormat", "JPEG");
intent.putExtra("noFaceDetection", true);
intent.putExtra("return-data", true);
startActivityForResult(intent, PHOTO_CUT);
}
}
xml布局文件如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:id="@+id/fromAlbum"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="从相册选取" />

<Button
android:id="@+id/takePhoto"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="拍照" />

<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp" />

</LinearLayout>

所用到的权限有：
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>