Android中通过访问本地相册或者相机设置用户头像实例

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.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import java.io.File;public class MainActivity extends AppCompatActivity implements View.OnClickListener {  private Button buttonLocal, buttonCamera;  private ImageView imageView;  //相机拍摄的头像文件(本次演示存放在SD卡根目录下)  private static final File USER_ICON = new File(Environment.getExternalStorageDirectory(), "user_icon.jpg");  //请求识别码(分别为本地相册、相机、图片裁剪)  private static final int CODE_PHOTO_REQUEST = 1;  private static final int CODE_CAMERA_REQUEST = 2;  private static final int CODE_PHOTO_CLIP = 3;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    buttonLocal = (Button) findViewById(R.id.buttonLocal);    buttonCamera = (Button) findViewById(R.id.buttonCamera);    imageView = (ImageView) findViewById(R.id.imageView);    buttonLocal.setOnClickListener(this);    buttonCamera.setOnClickListener(this);  }  //设置点击事件  @Override  public void onClick(View view) {    switch (view.getId()) {      case R.id.buttonLocal:        //调用获取本地图片的方法        getPicFromLocal();        break;      case R.id.buttonCamera:        //调用相机拍照的方法        getPicFromCamera();        break;      default:        break;    }  }  /**   * 从本机相册获取图片   */  private void getPicFromLocal() {    Intent intent = new Intent();    // 获取本地相册方法一    intent.setAction(Intent.ACTION_GET_CONTENT);    intent.setType("image/*");    //获取本地相册方法二//    intent.setAction(Intent.ACTION_PICK);//    intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,//        "image/*");    startActivityForResult(intent, CODE_PHOTO_REQUEST);  }  /**   * 通过相机拍摄获取图片，   * 并存入设置的路径中   */  private void getPicFromCamera() {    Intent intent = new Intent();    intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);    // 下面这句指定调用相机拍照后的照片存储的路径    intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(USER_ICON));    startActivityForResult(intent, CODE_CAMERA_REQUEST);  }  /**   * 图片裁剪   *   * @param uri   */  private void photoClip(Uri uri) {    // 调用系统中自带的图片剪裁    Intent intent = new Intent();    intent.setAction("com.android.camera.action.CROP");    intent.setDataAndType(uri, "image/*");    // 下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪    intent.putExtra("crop", "true");    // aspectX aspectY 是宽高的比例    intent.putExtra("aspectX", 1);    intent.putExtra("aspectY", 1);    /*outputX outputY 是裁剪图片宽高     *这里仅仅是头像展示，不建议将值设置过高     * 否则超过binder机制的缓存大小的1M限制     * 报TransactionTooLargeException     */    intent.putExtra("outputX", 150);    intent.putExtra("outputY", 150);    intent.putExtra("return-data", true);    startActivityForResult(intent, CODE_PHOTO_CLIP);  }  /**   * 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");      imageView.setImageBitmap(photo);    }  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    // 用户没有进行有效的设置操作，返回    if (resultCode == RESULT_CANCELED) {      Toast.makeText(MainActivity.this, "取消", Toast.LENGTH_LONG).show();      return;    }    switch (requestCode) {      case CODE_CAMERA_REQUEST:        if (USER_ICON.exists()) {          photoClip(Uri.fromFile(USER_ICON));        }        break;      case CODE_PHOTO_REQUEST:        if (data != null) {          photoClip(data.getData());        }        break;      case CODE_PHOTO_CLIP:        if (data != null) {          setImageToHeadView(data);        }        break;    }    super.onActivityResult(requestCode, resultCode, data);  }}