Android打开系统相机并拍照的2种显示方法

<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"
 tools:context=".MainActivity" >
 
 <Button
  android:id="@ id/btnOpenCamera"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="10dp"
  android:text="拍照立即显示" />
 <Button
  android:id="@ id/btnSavePhoto"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="60dp"
  android:text="拍照存储后显示" />
 
 <ImageView
  android:id="@ id/ivShowPicture"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_centerHorizontal="true"
  android:layout_marginTop="130dp" />
</RelativeLayout>

package com.example.camera;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
 
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
 
public class MainActivity extends Activity implements OnClickListener {
 
 private Button btnOpenCamera, btnSavePhoto;
 private ImageView ivShowPicture;
 private static int REQUEST_CAMERA_1 = 1;
 private static int REQUEST_CAMERA_2 = 2;
 private String mFilePath;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 // 初始化控件
 init();
 
 // 控件绑定点击事件
 bindClick();
 }
 
 // 初始化控件和变量
 private void init() {
 btnOpenCamera = (Button) findViewById(R.id.btnOpenCamera);
 btnSavePhoto = (Button) findViewById(R.id.btnSavePhoto);
 ivShowPicture = (ImageView) findViewById(R.id.ivShowPicture);
 mFilePath = Environment.getExternalStorageDirectory().getPath();// 获取SD卡路径
 mFilePath = mFilePath   "/"   "temp.png";// 指定路径
 }
 
 // 控件绑定点击事件
 private void bindClick() {
 btnOpenCamera.setOnClickListener(this);
 btnSavePhoto.setOnClickListener(this);
 }
 
 @Override
 public void onClick(View view) {
 switch (view.getId()) {
 case R.id.btnOpenCamera:
 // 拍照并显示图片
 openCamera_1();
 break;
 case R.id.btnSavePhoto:
 // 拍照后存储并显示图片
 openCamera_2();
 break;
 default:
 break;
 }
 }
 
 // 拍照并显示图片
 private void openCamera_1() {
 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 启动系统相机
 startActivityForResult(intent, REQUEST_CAMERA_1);
 }
 
 // 拍照后存储并显示图片
 private void openCamera_2() {
 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 启动系统相机
 Uri photoUri = Uri.fromFile(new File(mFilePath)); // 传递路径
 intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);// 更改系统默认存储路径
 startActivityForResult(intent, REQUEST_CAMERA_2);
 }
 
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 super.onActivityResult(requestCode, resultCode, data);
 if (resultCode == RESULT_OK) { // 如果返回数据
 if (requestCode == REQUEST_CAMERA_1) { // 判断请求码是否为REQUEST_CAMERA,如果是代表是这个页面传过去的，需要进行获取
 Bundle bundle = data.getExtras(); // 从data中取出传递回来缩略图的信息，图片质量差，适合传递小图片
 Bitmap bitmap = (Bitmap) bundle.get("data"); // 将data中的信息流解析为Bitmap类型
 ivShowPicture.setImageBitmap(bitmap);// 显示图片
 } else if (requestCode == REQUEST_CAMERA_2) {
 FileInputStream fis = null;
 try {
  fis = new FileInputStream(mFilePath); // 根据路径获取数据
  Bitmap bitmap = BitmapFactory.decodeStream(fis);
  ivShowPicture.setImageBitmap(bitmap);// 显示图片
 } catch (FileNotFoundException e) {
  e.printStackTrace();
 } finally {
  try {
  fis.close();// 关闭流
  } catch (IOException e) {
  e.printStackTrace();
  }
 }
 }
 }
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.camera"
 android:versionCode="1"
 android:versionName="1.0" >
 
 <uses-sdk
  android:minSdkVersion="17"
  android:targetSdkVersion="19" />
 
 <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.camera.MainActivity"
   android:label="@string/app_name" >
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />
 
    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
   <!-- 注册相机功能，在别的程序Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);进行启动相机时也会选择是否启动该应用 -->
   <intent-filter>
    <action android:name="android.media.action.IMAGE_CAPTURE" />
 
    <category android:name="android.intent.category.DEFAULT" />
   </intent-filter>
  </activity>
 </application>
 
</manifest>