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 { /* 頭像文件 */ private static final String IMAGE_FILE_NAME = "temp_head_image.jpg"; /* 請求識別碼 */ private static final int CODE_GALLERY_REQUEST = 0xa0; private static final int CODE_CAMERA_REQUEST = 0xa1; private static final int CODE_RESULT_REQUEST = 0xa2; // 裁剪后圖片的寬(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; @Override protected 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() {  @Override  public void onClick(View v) {  choseHeadImageFromGallery();  } }); Button buttonCamera = (Button) findViewById(R.id.buttonCamera); buttonCamera.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {  choseHeadImageFromCameraCapture();  } }); } // 從本地相冊選取圖片作為頭像 private void choseHeadImageFromGallery() { Intent intentFromGallery = new Intent(); // 設置文件類型 intentFromGallery.setType("image/*"); intentFromGallery.setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(intentFromGallery, CODE_GALLERY_REQUEST); } // 啟動手機相機拍攝照片作為頭像 private void choseHeadImageFromCameraCapture() { Intent intentFromCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); // 判斷存儲卡是否可用，存儲照片文件 if (hasSdcard()) {  intentFromCapture.putExtra(MediaStore.EXTRA_OUTPUT, Uri   .fromFile(new File(Environment    .getExternalStorageDirectory(), IMAGE_FILE_NAME))); } startActivityForResult(intentFromCapture, CODE_CAMERA_REQUEST); } @Override protected void onActivityResult(int requestCode, int resultCode,  Intent intent) { // 用戶沒有進行有效的設置操作，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(), "沒有SDCard!", Toast.LENGTH_LONG)   .show();  }  break; case CODE_RESULT_REQUEST:  if (intent != null) {  setImageToHeadView(intent);  }  break; } super.onActivityResult(requestCode, resultCode, intent); } /** * 裁剪原始的圖片 */ public void cropRawPhoto(Uri uri) { Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); // 設置裁剪 intent.putExtra("crop", "true"); // aspectX , aspectY :寬高的比例 intent.putExtra("aspectX", 1); intent.putExtra("aspectY", 1); // outputX , outputY : 裁剪圖片寬高 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圖片數據，并設置頭像部分的View */ private void setImageToHeadView(Intent intent) { Bundle extras = intent.getExtras(); if (extras != null) {  Bitmap photo = extras.getParcelable("data");  headImage.setImageBitmap(photo); } } /** * 檢查設備是否存在SDCard的工具方法 */ public static boolean hasSdcard() { String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) {  // 有存儲的SDCard  return true; } else {  return false; } }}

<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="本地相冊選取頭像" />  <Button    android:id="@+id/buttonCamera"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="手機拍照選取頭像" /></LinearLayout>