換頭像的功能實現

效果圖

代碼

1. 佈局文件

<RelativeLayout 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"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/iv_head"
        android:layout_width="200dip"
        android:layout_height="200dip"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="210dip"
        android:src="@drawable/ic_launcher" />

    <Button
        android:id="@+id/btn_takephoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="拍照" />

    <Button
        android:id="@+id/btn_photos"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="從相冊取" />

</RelativeLayout>

1. MainActivity中的代碼：

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;


import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

@SuppressLint("SdCardPath")
public class MainActivity extends Activity implements OnClickListener {
    private ImageView ivHead;//頭像顯示
    private Button btnTakephoto;//拍照
    private Button btnPhotos;//相冊
    private Bitmap head;//頭像Bitmap
    private static String path="/sdcard/myHead/";//sd路徑

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        //初始化控件
        btnPhotos = (Button) findViewById(R.id.btn_photos);
        btnTakephoto = (Button) findViewById(R.id.btn_takephoto);
        btnPhotos.setOnClickListener(this);
        btnTakephoto.setOnClickListener(this);
        ivHead = (ImageView) findViewById(R.id.iv_head);
        Bitmap bt = BitmapFactory.decodeFile(path + "head.jpg");//從Sd中找頭像，轉換成Bitmap
        if(bt!=null){
            @SuppressWarnings("deprecation")
            Drawable drawable = new BitmapDrawable(bt);//轉換成drawable
            ivHead.setImageDrawable(drawable);
        }else{
            /**
             *  如果SD裏面沒有則需要從服務器取頭像，取回來的頭像再保存在SD中
             * 
             */
        }



    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn_photos://從相冊裏面取照片
            Intent intent1 = new Intent(Intent.ACTION_PICK, null);
            intent1.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
            startActivityForResult(intent1, 1);
            break;
        case R.id.btn_takephoto://調用相機拍照
            Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            intent2.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment.getExternalStorageDirectory(),
                            "head.jpg")));
            startActivityForResult(intent2, 2);//採用ForResult打開
            break;
        default:
            break;
        }
    }
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
        case 1:
            if (resultCode == RESULT_OK) {
                cropPhoto(data.getData());//裁剪圖片
            }

            break;
        case 2:
            if (resultCode == RESULT_OK) {
                File temp = new File(Environment.getExternalStorageDirectory()
                        + "/head.jpg");
                cropPhoto(Uri.fromFile(temp));//裁剪圖片
            }

            break;
        case 3:
            if (data != null) {
                Bundle extras = data.getExtras();
                head = extras.getParcelable("data");
                if(head!=null){
                    /**
                     * 上傳服務器代碼
                     */
                    setPicToView(head);//保存在SD卡中
                    ivHead.setImageBitmap(head);//用ImageView顯示出來
                }
            }
            break;
        default:
            break;

        }
        super.onActivityResult(requestCode, resultCode, data);
    };
    /**
     * 調用系統的裁剪
     * @param uri
     */
    public void cropPhoto(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        intent.putExtra("crop", "true");
         // aspectX aspectY 是寬高的比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪圖片寬高
        intent.putExtra("outputX", 150);
        intent.putExtra("outputY", 150);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, 3);
    }
    private void setPicToView(Bitmap mBitmap) {
         String sdStatus = Environment.getExternalStorageState();  
        if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 檢測sd是否可用  
               return;  
           }  
        FileOutputStream b = null;
        File file = new File(path);
        file.mkdirs();// 創建文件夾
        String fileName =path + "head.jpg";//圖片名字
        try {
            b = new FileOutputStream(fileName);
            mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把數據寫入文件

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
                //關閉流
                b.flush();
                b.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
}
}