Android设置头像，手机拍照或从本地相册选取图片作为头像

【Android设置头像，手机拍照或从本地相册选取图片作为头像】

像微信、QQ、微博等社交类的APP，通常都有设置头像的功能，设置头像通常有两种方式：

1，让用户通过选择本地相册之类的图片库中已有的图像，裁剪后作为头像。

2，让用户启动手机的相机拍照，拍完照片后裁剪，然后作为头像。

我现在写一个简单的完整代码例子，说明如何在Android中实现上述两个头像设置功能。

MainActivity.java文件：

package zhangpgil.photo;import java.io.File;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import android.content.Intent;import android.graphics.Bitmap;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;public class MainActivity extends ActionBarActivity {/* 头像文件 */private static final String IMAGE_FILE_NAME = "temp_head_image.jpg";/* 请求识别码 */private static final int CODE_GALLERY_REQUEST = 0xa0;private static final int CODE_CAMERA_REQUEST = 0xa1;private static final int CODE_RESULT_REQUEST = 0xa2;// 裁剪后图片的宽(X)和高(Y),480 X 480的正方形。private static int output_X = 480;private static int output_Y = 480;private ImageView headImage = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);headImage = (ImageView) findViewById(R.id.imageView);Button buttonLocal = (Button) findViewById(R.id.buttonLocal);buttonLocal.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {choseHeadImageFromGallery();}});Button buttonCamera = (Button) findViewById(R.id.buttonCamera);buttonCamera.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {choseHeadImageFromCameraCapture();}});}// 从本地相册选取图片作为头像private void choseHeadImageFromGallery() {Intent intentFromGallery = new Intent();// 设置文件类型intentFromGallery.setType("image/*");intentFromGallery.setAction(Intent.ACTION_GET_CONTENT);startActivityForResult(intentFromGallery, CODE_GALLERY_REQUEST);}// 启动手机相机拍摄照片作为头像private void choseHeadImageFromCameraCapture() {Intent intentFromCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 判断存储卡是否可用，存储照片文件if (hasSdcard()) {intentFromCapture.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment.getExternalStorageDirectory(), IMAGE_FILE_NAME)));}startActivityForResult(intentFromCapture, CODE_CAMERA_REQUEST);}@Overrideprotected void onActivityResult(int requestCode, int resultCode,Intent intent) {// 用户没有进行有效的设置操作，返回if (resultCode == RESULT_CANCELED) {Toast.makeText(getApplication(), "取消", Toast.LENGTH_LONG).show();return;}switch (requestCode) {case CODE_GALLERY_REQUEST:cropRawPhoto(intent.getData());break;case CODE_CAMERA_REQUEST:if (hasSdcard()) {File tempFile = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);cropRawPhoto(Uri.fromFile(tempFile));} else {Toast.makeText(getApplication(), "没有SDCard!", Toast.LENGTH_LONG).show();}break;case CODE_RESULT_REQUEST:if (intent != null) {setImageToHeadView(intent);}break;}super.onActivityResult(requestCode, resultCode, intent);}/** * 裁剪原始的图片 */public void cropRawPhoto(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 :宽高的比例intent.putExtra("aspectX", 1);intent.putExtra("aspectY", 1);// outputX , outputY : 裁剪图片宽高intent.putExtra("outputX", output_X);intent.putExtra("outputY", output_Y);intent.putExtra("return-data", true);startActivityForResult(intent, CODE_RESULT_REQUEST);}/** * 提取保存裁剪之后的图片数据，并设置头像部分的View */private void setImageToHeadView(Intent intent) {Bundle extras = intent.getExtras();if (extras != null) {Bitmap photo = extras.getParcelable("data");headImage.setImageBitmap(photo);}}/** * 检查设备是否存在SDCard的工具方法 */public static boolean hasSdcard() {String state = Environment.getExternalStorageState();if (state.equals(Environment.MEDIA_MOUNTED)) {// 有存储的SDCardreturn true;} else {return false;}}}

布局文件有三个组件：放置头像的ImageView，两个Button，其中一个Button触发从本地相册选取图片作为头像的操作时间；另外一个Button触发手机拍摄照片作为头像的操作事件。activity_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ImageView        android:id="@+id/imageView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/ic_launcher" />    <Button        android:id="@+id/buttonLocal"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="本地相册选取头像" />    <Button        android:id="@+id/buttonCamera"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="手机拍照选取头像" /></LinearLayout>

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