Android -- 显示圆形头像

一. 前言

这章将从相册和拍照获取图片，并显示成圆形图片。

二. 准备

首先需要做一个圆形的显示区域，我用的是CircleImageView开源库

CircleImageView源码地址：https://github.com/hdodenhof/CircleImageView

（1）下载CircleImageView源码

（2）将CircleImageView.class添加到你的项目中，一般存在工具类中

（3）添加后会出现一些错误信息，这时我们需要将CircleImageView源码包中res/values/attrs.xml添加到我们的res/values下

注：attrs.xml中的参数与CircleImageView.class有关联，所有要修改就一起改。

三. 实现

activity.xml布局

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

            android:id="@+id/touxiang"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:src="@mipmap/logo_image"
        app:civ_border_width="2dp"
        app:civ_border_color="@color/colorBlack" />

注：这里需要添加xmlns.app,不然会报错。手敲app后选择第二个自动导入。

MainActivity.xml

import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.jmg.utils.CircleImageView;

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

public class MainActivity extends AppCompatActivity {

    private CircleImageView imageView;
    private Bitmap head;// 头像Bitmap
    private static String path = "/sdcard/myHead/";// sd路径

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (CircleImageView) findViewById(R.id.touxiang);
        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showTypeDialog();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case 1:
                if (resultCode == RESULT_OK) {
                    cropPhoto(data.getData());// 裁剪图片
                }

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

                break;
            case 3:
                if (data != null) {
                    Bundle extras = data.getExtras();
                    head = extras.getParcelable("data");
                    if (head != null) {
                        setPicToView(head);// 保存在SD卡中
                        imageView.setImageBitmap(head);// 用ImageButton显示出来
                    }
                }
                break;
            default:
                break;

        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    private void showTypeDialog() {
        //显示对话框
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        final AlertDialog dialog = builder.create();
        View view = View.inflate(this, R.layout.dialog_select, null);
        TextView tv_select_gallery = (TextView) view.findViewById(R.id.tv_select_gallery);
        TextView tv_select_camera = (TextView) view.findViewById(R.id.tv_select_camera);
        tv_select_gallery.setOnClickListener(new View.OnClickListener() {// 在相册中选取
            @Override
            public void onClick(View v) {
                Intent intent1 = new Intent(Intent.ACTION_PICK, null);
                //打开文件
                intent1.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
                startActivityForResult(intent1, 1);
                dialog.dismiss();
            }
        });
        tv_select_camera.setOnClickListener(new View.OnClickListener() {// 调用照相机
            @Override
            public void onClick(View v) {
                Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent2.putExtra(MediaStore.EXTRA_OUTPUT,
                        Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "head.jpg")));
                startActivityForResult(intent2, 2);// 采用ForResult打开
                dialog.dismiss();
            }
        });
        dialog.setView(view);
        dialog.show();
    }

    /**
     * 调用系统的裁剪功能
     *
     * @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 是宽高的比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪图片宽高
        intent.putExtra("outputX", 250);
        intent.putExtra("outputY", 250);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, 3);
    }

    private void setPicToView(Bitmap mBitmap) {
        String sdStatus = Environment.getExternalStorageState();
        if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
            return;
        }
        FileOutputStream b = null;
        File file = new File(path);
        file.mkdirs();// 创建文件夹
        String fileName = path + "head.jpg";// 图片名字
        try {
            b = new FileOutputStream(fileName);
            mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭流
                if (b != null) {
                    b.flush();
                    b.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

注：添加以上如果在android 7.0系统运行会出现奔溃

添加MyApplication.class

import android.app.Application;
import android.os.StrictMode;

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        // android 7.0系统解决拍照的问题
        StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder.build());
        builder.detectFileUriExposure();
    }
}

然后再AndroidManifest.xml中添加

    android:name=".MyApplication"    //添加这一行

后续还会添加各手机获取相册图片或拍照会出现的问题及解决办法。

The End!

每天进步一点点！