android Camera捕获数据

介绍：使用android自带的camera应用程序获取图片并显示在自定义的ImageView控件中。

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/takePhoto" />    <ImageView        android:id="@+id/imgView"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:contentDescription="@string/imgView"/></LinearLayout>

MainActivity.java

package cn.yh.cameratest;import java.io.File;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Color;import android.graphics.BitmapFactory.Options;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.view.Display;import android.view.Menu;import android.widget.ImageView;public class MainActivity extends Activity {private final static int CAMERA_RESULT = 0;private ImageView imgview;private String imageFilePath;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//获取SDCard的位置，并在SDCard根下定义图片的名称。imageFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/myCameraTest.jpg";File imageFile = new File(imageFilePath);Uri imageFileUri = Uri.fromFile(imageFile);//android.provider.MediaStore.ACTION_IMAGE_CAPTURE：camera启动意图；Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);//android.provider.MediaStore.EXTRA_OUTPUT:给意图附加参数，指定图片保存的路径；intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageFileUri);//使用startActivityForResult方法，在Camera活动结束之后，进入onActivityResult方法；startActivityForResult(intent, CAMERA_RESULT);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overrideprotected void onActivityResult(int requestCode, int resultCode,Intent intent) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, intent);if (resultCode == RESULT_OK) {//1.简单获取到捕捉到的数据，显示时只是显示一副处理过的缩略图。// Bundle bundle = intent.getExtras();// Bitmap bitmap = (Bitmap) bundle.get("data");//// imgview = (ImageView) findViewById(R.id.imgView);// imgview.setImageBitmap(bitmap);/*2.设置图片大小为原图的1/8BitmapFactory.Options bmFactoryOptions = new Options();bmFactoryOptions.inSampleSize = 8;Bitmap bitmap = BitmapFactory.decodeFile(imageFilePath,bmFactoryOptions);*///3.根据屏幕的大小来显示图片Display display = getWindowManager().getDefaultDisplay();int dw = display.getWidth();int dh = display.getHeight();//加载图像的尺寸，而不是图像本身。BitmapFactory.Options bmFactoryOptions = new Options();bmFactoryOptions.inJustDecodeBounds = true;Bitmap bitmap = BitmapFactory.decodeFile(imageFilePath,bmFactoryOptions);int hRatio = (int) Math.ceil(bmFactoryOptions.outHeight/(float)dh);int wRatio = (int) Math.ceil(bmFactoryOptions.outWidth/(float)dw);//判断是按高比率缩放还是宽比例缩放if(hRatio > 1 && wRatio > 1){if(hRatio > wRatio){bmFactoryOptions.inSampleSize = hRatio;}else{bmFactoryOptions.inSampleSize = wRatio;}}//对图像进行真正的解码bmFactoryOptions.inJustDecodeBounds = false;bitmap = BitmapFactory.decodeFile(imageFilePath,bmFactoryOptions);imgview = (ImageView) findViewById(R.id.imgView);imgview.setBackgroundColor(Color.GRAY);imgview.setImageBitmap(bitmap);}}}