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>