<manifest ... ><uses-feature android:name="android.hardware.camera"android:required="true" />...
</manifest>

<uses-permission android:name="android.permission.CAMERA2" />
或者：
<uses-permission android:name="android.permission.CAMERA" />

static final int REQUEST_IMAGE_CAPTURE = 1;private void dispatchTakePictureIntent() {Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);if (takePictureIntent.resolveActivity(getPackageManager()) != null) {startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);}
}

package com.example.hp.photointent;import android.content.Intent;
import android.graphics.Bitmap;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;public class MainActivity extends AppCompatActivity implements View.OnClickListener {static final int REQUEST_IMAGE_CAPTURE = 1;private ImageView mImageView;private Button btn_take_photo;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();}void init(){mImageView=(ImageView)findViewById(R.id.imageView1);btn_take_photo=(Button)findViewById(R.id.btn_take_photo);btn_take_photo.setOnClickListener(this);}@Overridepublic void onClick(View view) {switch( view.getId()){case R.id.btn_take_photo:dispatchTakePictureIntent();break;default:break;}}　　//Android的相机应用会把拍好的照片编码为缩小的Bitmap，使用extra value的方式添加到返回的Intent当中　　//并传送给onActivityResult()，对应的Key为"data"。@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {Bundle extras = data.getExtras();Bitmap imageBitmap = (Bitmap) extras.get("data");mImageView.setImageBitmap(imageBitmap);}}//调用拍照Intentprivate void dispatchTakePictureIntent() {Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);if (takePictureIntent.resolveActivity(getPackageManager()) != null) {startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);}}
}

static final int REQUEST_VIDEO_CAPTURE = 1;private void dispatchTakeVideoIntent() {Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);if (takeVideoIntent.resolveActivity(getPackageManager()) != null) {startActivityForResult(takeVideoIntent, REQUEST_VIDEO_CAPTURE);}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK) {Uri videoUri = intent.getData();mVideoView.setVideoURI(videoUri);}
}