package com.example;

import java.io.File;

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.os.Environment;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

	final static int CAMERA_RESULT = 0;
	ImageView imv;
	Button but;

	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.fragment_main);
		findViewById();

		but.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {

                               /*运行Camera内置摄像头意图*/
				Intent i = new Intent(
						android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
				startActivityForResult(i, CAMERA_RESULT);
				
			}
		});
	}

	private void findViewById() {
		but = (Button) findViewById(R.id.but);
		imv = (ImageView) findViewById(R.id.img);
	}

        /* 当activity运行完后，就显示照片*/

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (resultCode == RESULT_OK) {
			Bundle bundle = data.getExtras();
			Bitmap bmp = (Bitmap) bundle.get("data");
			imv.setImageBitmap(bmp);
		
		}
	}

	
}

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.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>

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >
   
     <ImageView 
         android:id="@+id/img"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentTop="true"
         android:layout_centerInParent="true"
         />
     
     <Button 
         android:id="@+id/but"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/img"
         android:layout_centerInParent="true"
         android:text="take_a_picture"/>
    

</RelativeLayout>