• android——拍照,相册图片剪切其实就这么简单


    接触android这么久了。还没有真正的浩浩看看android拍照,相册图片剪切到底是怎么回事,每次都是从别人的代码一扣,就过来了。其实,谷歌提供的API已经很强大。只需要用的好,就那么几句就可以搞定神秘的拍照和剪切图片。废话不多少,直接看源码

    package com.example.testcamera;
    
    import java.io.FileNotFoundException;
    
    import android.app.Activity;
    import android.content.Intent;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.net.Uri;
    import android.os.Bundle;
    import android.provider.MediaStore;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.ImageView;
    
    public class MainActivity extends Activity implements OnClickListener {
        private Button btnc, btnp;
        private ImageView img;
        private Intent intent;
        private final int dataFromCamera = 1;
        private final int dataFromAlbum = 2;
        private final int cropFromCamera = 3;
        private final int cropFromAlbum = 4;
        private Uri mUri = null;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initView();
        }
    
        private void initView() {
            btnc = (Button) findViewById(R.id.btnc);
            btnp = (Button) findViewById(R.id.btnp);
            img = (ImageView) findViewById(R.id.img);
            btnc.setOnClickListener(this);
            btnp.setOnClickListener(this);
    
        }
    
        @Override
        public void onClick(View v) {
            int id = v.getId();
            switch (id) {
            case R.id.btnc:
                openCamera();
                break;
            case R.id.btnp:
                openPhoto();
                break;
            default:
                break;
            }
    
        }
    
        private void openCamera() {
            intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(intent, dataFromCamera);
        }
    
        private void openPhoto() {
            intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.setType("image/*");
            startActivityForResult(intent, dataFromAlbum);
        }
    
        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (resultCode == RESULT_OK) {
                Uri uri = null;
                if (data.getData() != null) {
                    uri = data.getData();
                    mUri = uri;
                }
                switch (requestCode) {
                case dataFromCamera:
                    cropImageUri(uri, 800, 600, cropFromCamera);
                    break;
                case dataFromAlbum:
                    cropImageUri(uri, 800, 600, cropFromAlbum);
                    break;
                case cropFromCamera:
                    if (mUri != null) {
                        Bitmap bitmap = decodeUriAsBitmap(mUri);
                        img.setImageBitmap(bitmap);
                    }
                    break;
                case cropFromAlbum:
                    if (mUri != null) {
                        Bitmap bitmap = decodeUriAsBitmap(mUri);
                        img.setImageBitmap(bitmap);
                    }
                    break;
                default:
                    break;
    
                }
            }
    
        }
    
        private void cropImageUri(Uri uri, int outputX, int outputY, int requestCode) {
    
            Intent intent = new Intent("com.android.camera.action.CROP");
    
            intent.setDataAndType(uri, "image/*");
    
            intent.putExtra("crop", "true");
    
            intent.putExtra("aspectX", 4);
    
            intent.putExtra("aspectY", 3);
    
            intent.putExtra("outputX", outputX);
    
            intent.putExtra("outputY", outputY);
    
            intent.putExtra("scale", true);
    
            intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
    
            intent.putExtra("return-data", false);
    
            intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
    
            intent.putExtra("noFaceDetection", true); // no face detection
    
            startActivityForResult(intent, requestCode);
    
        }
    
        private Bitmap decodeUriAsBitmap(Uri uri) {
            Bitmap bitmap = null;
            try {
                bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                return null;
            }
            return bitmap;
        }
    
    }

    xml布局文件

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
    
        <Button
            android:id="@+id/btnc"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/holo_purple"
            android:text="拍照"
            android:textColor="@android:color/white" />
    
        <Button
            android:id="@+id/btnp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/holo_orange_dark"
            android:text="从相册中选取"
            android:textColor="@android:color/white" />
    
        <ImageView
            android:id="@+id/img"
            android:layout_width="300dp"
            android:layout_height="300dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="50dp" />
    
    </LinearLayout>

    mainfest.xml文件

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.testcamera"
        android:versionCode="1"
        android:versionName="1.0" >
    
        <uses-sdk
            android:minSdkVersion="16"
            android:targetSdkVersion="18" />
    
        <uses-permission android:name="android.permission.CAMERA" />
        <uses-feature android:name="android.hardware.camera" />
        <uses-feature android:name="android.hardware.camera.autofocus" />
    
        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <activity
                android:name=".MainActivity"
                android:label="@string/app_name" >
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>

    注意要配置权限呀。

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  • 原文地址:https://www.cnblogs.com/shoneworn/p/corp.html
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