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Android[高级教程] Android程序调用摄像头

很多开发者都想在程序用来调用摄像头,并对拍出的照片进行处理。首先先对程序的进行一下预览

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首先先对主页面进行设计,这里很简单,只是加了个按钮和一张图片


[html] <?xml version="1.0" encoding="utf-8"?> 
<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/button1" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/camera" /> 
 
 
 
 
    <ImageView 
        android:id="@+id/imageView1" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:src="@drawable/ic_launcher" /> 
 
</LinearLayout> 
<?xml version="1.0" encoding="utf-8"?>
<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/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/camera" />

 


    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>


接下来就是对按钮事件进行处理,按下按钮的时候会调用本机摄像头

[java] //图片存入地址   www.zzzyk.com
        imageFilePath = Environment.getExternalStorageDirectory() 
                .getAbsolutePath() + "/mypicture.jpg"; 
        File imageFile = new File(imageFilePath); 
        Uri imageFileUri = Uri.fromFile(imageFile); 
 
        Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
        i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageFileUri); 
        startActivityForResult(i, CAMERA_RESULT); 
//图片存入地址
  imageFilePath = Environment.getExternalStorageDirectory()
    .getAbsolutePath() + "/mypicture.jpg";
  File imageFile = new File(imageFilePath);
  Uri imageFileUri = Uri.fromFile(imageFile);

  Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
  i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageFileUri);
  startActivityForResult(i, CAMERA_RESULT);

 


Intent直接调用了本机的拍照程序,并把拍的图片存在内存卡里,接下来就是要在我们自己的程序里显示拍的照片了
这里我们直接用了Activity里的onActivityResult这个方法,这个方法是对Activity返回结果的处理
[java] @Override
    protected void onActivityResult(int requestCode, int resultCode, 
            Intent intent) { 
        // TODO Auto-generated method stub  
        super.onActivityResult(requestCode, resultCode, intent); 
 
        //如果拍照成功  
        if (resultCode == RESULT_OK) { 
 
            // Bundle extras = intent.getExtras();  
            // Bitmap bmp = (Bitmap)extras.get("data");  
 
            imv = (ImageView) findViewById(R.id.imageView1); 
 
            //取得屏幕的显示大小  
            Display currentDisplay = getWindowManager().getDefaultDisplay(); 
            int dw = currentDisplay.getWidth(); 
            int dh = currentDisplay.getHeight(); 
 
            //对拍出的照片进行缩放  
            BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options(); 
            bmpFactoryOptions.inJustDecodeBounds = true; 
            Bitmap bmp = BitmapFactory.decodeFile(imageFilePath, 
                    bmpFactoryOptions); 
 
            int heightRatio = (int) Math.ceil(bmpFactoryOptions.outHeight 
                    / (float) dh); 
            int widthRatio = (int) Math.ceil(bmpFactoryOptions.outWidth 
                    / (float) dw); 
 
            if (heightRatio > 1 && widthRatio > 1) { 
 
                if (heightRatio > widthRatio) { 
 
               &n

补充:移动开发 , Android ,
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