在我們android開發中經常需要做這個一個功能,調用系統相機拍照,然後擷取拍攝的照片。下面是我總結的兩種方法擷取拍攝之後的照片,一種是通過Bundle來擷取壓縮過的照片,一種是通過SD卡擷取的原圖。
下面是示範代碼:
布局檔案:
<LinearLayout 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"
android:orientation="vertical"
android:gravity="center_horizontal"
>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="拍照擷取縮略圖" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="14dp"
android:text="拍照擷取原圖" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_launcher" />
</LinearLayout>
java代碼:
package com.example.cameardemo;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends ActionBarActivity implements OnClickListener {
private static int REQUEST_THUMBNAIL = 1;// 請求縮略圖信号辨別
private static int REQUEST_ORIGINAL = 2;// 請求原圖信号辨別
private Button button1, button2;
private ImageView mImageView;
private String sdPath;//SD卡的路徑
private String picPath;//圖檔存儲路徑
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
mImageView = (ImageView) findViewById(R.id.imageView1);
button1.setOnClickListener(this);
button2.setOnClickListener(this);
//擷取SD卡的路徑
sdPath = Environment.getExternalStorageDirectory().getPath();
picPath = sdPath + "/" + "temp.png";
Log.e("sdPath1",sdPath);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.button1://第一種方法,擷取壓縮圖
Intent intent1 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// 啟動相機
startActivityForResult(intent1, REQUEST_THUMBNAIL);
break;
case R.id.button2://第二種方法,擷取原圖
Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Uri uri = Uri.fromFile(new File(picPath));
//為拍攝的圖檔指定一個存儲的路徑
intent2.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent2, REQUEST_ORIGINAL);
break;
default:
break;
}
}
/**
* 傳回應用時回調方法
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == REQUEST_THUMBNAIL) {//對應第一種方法
/**
* 通過這種方法取出的拍攝會預設壓縮,因為如果相機的像素比較高拍攝出來的圖會比較高清,
* 如果圖太大會造成記憶體溢出(OOM),是以此種方法會預設給圖檔盡心壓縮
*/
Bundle bundle = data.getExtras();
Bitmap bitmap = (Bitmap) bundle.get("data");
mImageView.setImageBitmap(bitmap);
}
else if(resultCode == REQUEST_ORIGINAL){//對應第二種方法
/**
* 這種方法是通過記憶體卡的路徑進行讀取圖檔,是以的到的圖檔是拍攝的原圖
*/
FileInputStream fis = null;
try {
Log.e("sdPath2",picPath);
//把圖檔轉化為位元組流
fis = new FileInputStream(picPath);
//把流轉化圖檔
Bitmap bitmap = BitmapFactory.decodeStream(fis);
mImageView.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}finally{
try {
fis.close();//關閉流
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
最後不要忘記在清單檔案上添加上讀取SD卡的權限:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.cameardemo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<!-- 操作sd卡的權限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.cameardemo.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<!-- 具有相機功能 -->
<intent-filter >
<action android:name="android.media.action.IMAGE_CAPTURE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>