Android 实现头像上传（从手机或者相机上传头像）

来源：互联网发布：修改linux运行级别编辑：程序博客网时间：2024/04/29 23:34

最近公司在做项目的时候要求有头像上传的功能，以前没弄过，所以研究一下，写了个Demo仅供大家参考：

首先，大家要了解头像上传需要怎么做。第一。我们要选择图片或者从照相机照一张。第二，需要对头像图片进行处理，第三就是要把头像显示到ImageView上了。

先看看布局文件，特别简单

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    android:layout_marginTop="100dp"
    tools:context=".MainActivity" >
   <ImageView
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:src="@drawable/ic_launcher"
        android:id="@+id/iv"/>

   <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="从图库中选择"
        android:id="@+id/bt_select"/>
   <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="相机拍照上传"
        android:id="@+id/bt_cam"/>
</LinearLayout>
下面看看我们在MainActivity中做了那些：

import java.io.File;

import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.Menu;
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 implements OnClickListener {

//我们不论是照相还是从图库选择都需要用到一个方法onActivityResult，所以我们要对请求码作出相应的设置

    private static final int IMAGE_REQUEST_CODE = 0;
   private static final int CAMERA_REQUEST_CODE = 1;
   private static final int RESIZE_REQUEST_CODE = 2;
   private static final String IMAGE_FILE_NAME = "header.jpg";
   private ImageView iv;
   private Button bt_select;
   private Button bt_cam;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       initView();
   }
//初始化View
   private void initView() {
       iv = (ImageView) findViewById(R.id.iv);
       bt_cam = (Button) findViewById(R.id.bt_cam);
       bt_select = (Button) findViewById(R.id.bt_select);
       bt_select.setOnClickListener(this);
       bt_cam.setOnClickListener(this);
   }

   @Override
   public void onClick(View v) {
       switch (v.getId()) {
       // 从图库中选择
       case R.id.bt_select:
           Intent intent1 = new Intent(Intent.ACTION_GET_CONTENT);
           intent1.addCategory(Intent.CATEGORY_OPENABLE);
           intent1.setType("image/*");
           startActivityForResult(intent1, IMAGE_REQUEST_CODE);
           break;
       // 从相机拍照
       case R.id.bt_cam:
           if (isSdcardExisting()) {
               Intent cameraIntent = new Intent(
                       "android.media.action.IMAGE_CAPTURE");
               cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());
               cameraIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
               startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);
           } else {
               Toast.makeText(v.getContext(), "请插入sd卡", Toast.LENGTH_LONG)
                       .show();
           }
           break;

       default:
           break;
       }
   }
//获取图片的URI
   private Uri getImageUri() {
       return Uri.fromFile(new File(Environment.getExternalStorageDirectory(),
                IMAGE_FILE_NAME));
   }
//该方法是用于放回相应结果的
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       if(resultCode==RESULT_OK){
           switch (requestCode) {
           case IMAGE_REQUEST_CODE:
               resizeImage(data.getData());
               break;
           case CAMERA_REQUEST_CODE:
               if(isSdcardExisting()){
                   resizeImage(getImageUri());
               }else{
           Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！",
                                Toast.LENGTH_LONG).show();
               }
               break;
           case RESIZE_REQUEST_CODE:
               if (data != null) {
                        showResizeImage(data);
                    }
               break;

           }
       }
       super.onActivityResult(requestCode, resultCode, data);
   }
   /**
   * 展示头像
   * @param data
   */
   private void showResizeImage(Intent data) {
          Bundle extras = data.getExtras();
            if (extras != null) {
                Bitmap photo = extras.getParcelable("data");
                Drawable drawable = new BitmapDrawable(photo);
                iv.setImageDrawable(drawable);
            }
   }

   /**
   * 对图片进行处理
   * @param uri
   */
   private void resizeImage(Uri uri) {
          Intent intent = new Intent("com.android.camera.action.CROP");
            intent.setDataAndType(uri, "image/*");
            intent.putExtra("crop", "true");
            intent.putExtra("aspectX", 1);
            intent.putExtra("aspectY", 1);
            intent.putExtra("outputX", 150);
            intent.putExtra("outputY", 150);
            intent.putExtra("return-data", true);
            startActivityForResult(intent, RESIZE_REQUEST_CODE);
   }

   /**
   * 判断sd卡是否存在
   *
   * @return
   */
   private boolean isSdcardExisting() {
       final String state = Environment.getExternalStorageState();
       if (state.equals(Environment.MEDIA_MOUNTED)) {
           return true;
       } else {
           return false;
       }
   }

}

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