Android更換頭像功能實現，android更換頭像

Android更換頭像功能實現，android更換頭像

現在不管什麼APP都有個頭像，如果你看見沒有頭像的APP就會感覺非常奇怪，以前頭像都是方的，後來就變成圓的，我估計在過個幾年就得來個五角星形狀的頭像，下面我把更換頭像的代碼寫來：

<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="從相簿取" /></RelativeLayout>

首先我定義了一個非常簡單的XML布局，裡面兩個Button，一個ImageView用來顯示頭像：

下面我來看看MainActivity代碼：

package com.example.changhead;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;//相簿private Bitmap head;//頭像Bitmapprivate static String path="/sdcard/myHead/";//sd路徑@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {//初始化控制項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Bitmapif(bt!=null){@SuppressWarnings("deprecation")Drawable drawable = new BitmapDrawable(bt);//轉換成drawableivHead.setImageDrawable(drawable);}else{/** *如果SD裡面沒有則需要從伺服器取頭像，取回來的頭像再儲存在SD中 *  */}}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn_photos://從相簿裡面取照片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開啟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){/** * 上傳伺服器代碼 */setPicToView(head);//儲存在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();// 建立檔案夾String fileName =path + "head.jpg";//圖片名字try {b = new FileOutputStream(fileName);mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把資料寫入檔案} catch (FileNotFoundException e) {e.printStackTrace();} finally {try {//關閉流b.flush();b.close();} catch (IOException e) {e.printStackTrace();}}}}

上面的注釋已經很詳細了，就這些

對了不要忘記加許可權：

<uses-permission android:name="android.permission.CAMERA"/><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>  

源碼下載

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