Android中设置用户的头像

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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;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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 stubIntent 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 stubIntent 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);}});}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubswitch (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, "image/*");intent.putExtra("crop", "true");// 裁剪框的比例，1：1intent.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"/>

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