四十七、實現調用Android手機的拍照功能

一、main.xml布局檔案

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><ImageView android:id="@+id/imageView"     android:adjustViewBounds="true"    android:layout_gravity="center"android:minWidth="150dip" android:minHeight="150dip"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Button android:id="@+id/btnPhone" android:layout_width="fill_parent"     android:layout_height="wrap_content"android:text="相簿" /><Button android:id="@+id/btnTakePicture"     android:layout_height="wrap_content"android:layout_width="fill_parent" android:text="拍照" /></LinearLayout>

             

            

二、核心代碼

package com.ljq.test;

import java.io.ByteArrayOutputStream;
import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class TestActivity extends Activity {
private static final int NONE = 0;
private static final int PHOTO_GRAPH = 1;// 拍照
    private static final int PHOTO_ZOOM = 2; // 縮放
    private static final int PHOTO_RESOULT = 3;// 結果
    private static final String IMAGE_UNSPECIFIED = "image/*";
private ImageView imageView = null;
private Button btnPhone = null;
private Button btnTakePicture = null;

    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        imageView = (ImageView) findViewById(R.id.imageView);
        btnPhone = (Button) findViewById(R.id.btnPhone);
        btnPhone.setOnClickListener(onClickListener);
        btnTakePicture = (Button) findViewById(R.id.btnTakePicture);
        btnTakePicture.setOnClickListener(onClickListener);
    }

private final View.OnClickListener onClickListener = new View.OnClickListener() {

        @Override
public void onClick(View v) {
if(v==btnPhone){ //從相簿擷取圖片
                Intent intent = new Intent(Intent.ACTION_PICK, null);
                intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_UNSPECIFIED);
                startActivityForResult(intent, PHOTO_ZOOM);
            }else if(v==btnTakePicture){ //從拍照擷取圖片
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment
                    .getExternalStorageDirectory(),"temp.jpg")));
                startActivityForResult(intent, PHOTO_GRAPH);
            }

        }

    };

    @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == NONE)
return;
// 拍照
        if (requestCode == PHOTO_GRAPH) {
// 設定檔案儲存路徑
            File picture = new File(Environment.getExternalStorageDirectory()
                    + "/temp.jpg");
            startPhotoZoom(Uri.fromFile(picture));
        }

if (data == null)
return;

// 讀取相簿縮放圖片
        if (requestCode == PHOTO_ZOOM) {
            startPhotoZoom(data.getData());
        }
// 處理結果
        if (requestCode == PHOTO_RESOULT) {
            Bundle extras = data.getExtras();
if (extras != null) {
                Bitmap photo = extras.getParcelable("data");
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);// (0-100)壓縮檔
//此處可以把Bitmap儲存到sd卡中，具體請看：http://www.cnblogs.com/linjiqin/archive/2011/12/28/2304940.html
                imageView.setImageBitmap(photo); //把圖片顯示在ImageView控制項上
            }

        }

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

/**
     * 收縮圖片
     * 
     * @param uri
*/
public void startPhotoZoom(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, IMAGE_UNSPECIFIED);
        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", 300);
        intent.putExtra("outputY", 500);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, PHOTO_RESOULT);
    }

}