Android 相机开发 三星拍照崩溃修改解决 详细

android 相机调用问题

三星系统4.0以上， 调用系统相机屏幕会强制切换为横屏 拍照完会切换为竖屏 点击保存回Activity 程序会直接崩溃

我理解的是：android系统在手机切换横竖屏的时候会把当前的activity销毁掉 然后又重新执行Oncreat方法

activity中设置得静态变量，所有的类变量居然都变成了空，而且在返回activity时重新执行oncreate(),由于变量都被回收，所以造成了空指针，目前解决方法也仅仅是在本activity中得变量在onSaveInstanceState()存储

这两天搜索网上的答案，找到很好的例子，然后我又重新整合了一下 多张连拍显示 可运行各个手机型号 暂时没发现BUG

开始贴代码

<activity
调用相机的类

android:name="com.example.camera.MainActivity"

android:label="@string/app_name"

android:configChanges="screenSize|keyboardHidden|orientation" 这个在所有调用相机的类里都要设置

android:screenOrientation="portrait" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

<activity 中间类不绘制布局

android:name="com.example.camera.UseCameraActivity"

android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|navigation"

android:launchMode="singleTop"

android:screenOrientation="portrait" />

布局文件

<?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" >

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="5dp"

android:gravity="center"

android:padding="15dp" >

<ImageView

android:id="@+id/btn_real_name_authentication_add_id_card_front"

android:layout_width="wrap_content"

android:layout_height="100dp"

android:layout_marginRight="10dp"

android:layout_weight="1"

android:src="@drawable/add_id_card_1" />

<ImageView

android:id="@+id/btn_real_name_authentication_add_id_card_side"

android:layout_width="wrap_content"

android:layout_height="100dp"

android:layout_marginLeft="10dp"

android:layout_weight="1"

android:src="@drawable/add_id_card_1" />

</LinearLayout>

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="10dp"

android:gravity="center"

android:padding="15dp" >

<ImageView

android:id="@+id/btn_bank_front"

android:layout_width="match_parent"

android:layout_height="100dp"

android:layout_marginRight="10dp"

android:layout_weight="1"

android:src="@drawable/add_id_card_1" />

<ImageView

android:id="@+id/btn_bank_side"

android:layout_width="match_parent"

android:layout_height="100dp"

android:layout_marginLeft="10dp"

android:layout_weight="1"

android:src="@drawable/add_id_card_1" />

</LinearLayout>

</LinearLayout>

</LinearLayout>



相机调用中间类

package com.example.camera;

import java.io.File;

import java.io.IOException;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.content.res.Configuration;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.provider.MediaStore;

import android.util.Log;

import android.view.KeyEvent;

/**

* 照片生成的目录在 sd卡的/a/image/camera/.. .jpg

*

* @author baozi

*

*/

public class UseCameraActivity extends Activity {

private String mImageFilePath;

public static final String IMAGEFILEPATH = "ImageFilePath";

public final static String IMAGE_PATH = "image_path";

static Activity mContext;

public final static int GET_IMAGE_REQ = 5000;

private static Context applicationContext;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//判断 activity被销毁后 有没有数据被保存下来

if (savedInstanceState != null) {

mImageFilePath = savedInstanceState.getString(IMAGEFILEPATH);

Log.i("123---savedInstanceState", mImageFilePath);

File mFile = new File(IMAGEFILEPATH);

if (mFile.exists()) {

Intent rsl = new Intent();

rsl.putExtra(IMAGE_PATH, mImageFilePath);

setResult(Activity.RESULT_OK, rsl);

Log.i("123---savedInstanceState", "图片拍摄成功");

finish();

} else {

Log.i("123---savedInstanceState", "图片拍摄失败");

}

}

mContext = this;

applicationContext = getApplicationContext();

if (savedInstanceState == null) {

initialUI();

}

}

public void initialUI() {

//根据时间生成 后缀为 .jpg 的图片

long ts = System.currentTimeMillis();

mImageFilePath = getCameraPath() + ts + ".jpg";

File out = new File(mImageFilePath);

showCamera(out);

}

private void showCamera(File out) {

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(out)); // set

startActivityForResult(intent, GET_IMAGE_REQ);

}

@Override

public void onActivityResult(int requestCode, int resultCode, Intent intent) {

if (GET_IMAGE_REQ == requestCode && resultCode == Activity.RESULT_OK) {

Intent rsl = new Intent();

rsl.putExtra(IMAGE_PATH, mImageFilePath);

mContext.setResult(Activity.RESULT_OK, rsl);

mContext.finish();

} else {

mContext.finish();

}

}

@Override

protected void onDestroy() {

super.onDestroy();

}

@Override

protected void onSaveInstanceState(Bundle outState) {

super.onSaveInstanceState(outState);

outState.putString("ImageFilePath", mImageFilePath + "");

}

@Override

public void onConfigurationChanged(Configuration newConfig) {

super.onConfigurationChanged(newConfig);

}

@Override

protected void onRestoreInstanceState(Bundle savedInstanceState) {

super.onRestoreInstanceState(savedInstanceState);

}

public static String getCameraPath() {

String filePath = getImageRootPath() + "/camera/";

File file = new File(filePath);

if (!file.isDirectory()) {

file.mkdirs();

}

file = null;

return filePath;

}

public static String getImageRootPath() {

String filePath = getAppRootPath() + "/image";

File file = new File(filePath);

if (!file.exists()) {

file.mkdirs();

}

file = null;

return filePath;

}

public static String getAppRootPath() {

String filePath = "/a";

if (Environment.getExternalStorageState().equals(

Environment.MEDIA_MOUNTED)) {

filePath = Environment.getExternalStorageDirectory() + filePath;

} else {

filePath = applicationContext.getCacheDir() + filePath;

}

File file = new File(filePath);

if (!file.exists()) {

file.mkdirs();

}

file = null;

File nomedia = new File(filePath + "/.nomedia");

if (!nomedia.exists())

try {

nomedia.createNewFile();

} catch (IOException e) {

}

return filePath;

}

/*public boolean onKeyDown(int keyCode, KeyEvent event) {

if(keyCode == KeyEvent.KEYCODE_BACK&& event.getAction() == KeyEvent.ACTION_DOWN){

Intent inte =new Intent(UseCameraActivity.this, MainActivity.class);

startActivity(inte);

return true;

}

return super.onKeyDown(keyCode, event);

}*/

}

然后是调用相机显示照片的activity

package com.example.camera;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import android.app.Activity;

import android.content.ContentResolver;

import android.content.Intent;

import android.content.res.Configuration;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.net.Uri;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

import com.example.camerabaozi.R;

import com.nostra13.universalimageloader.core.ImageLoader;

/**

* 启动界面

*

* 照片生成的目录在 sd卡的/a/image/camera/.. .jpg

*

* @author baozi

*

*/

public class MainActivity extends Activity implements OnClickListener{

private Bitmap bitmaps;

protected static final int REQCAMERA = 11;

private static final String TAG = "MainActivity";

private View button1;

private ImageView photo_iv;

private ContentResolver mContentResolver;

final int IMAGE_MAX_SIZE = 1024;

private ImageView lifttob,righttob,rightbom,liftbom;

private int volue =0;

protected static final int ADD_ID_CARD_FRONT = 101;

protected static final int ADD_ID_CARD_SIDE = 102;

protected static final int ADD_BANK_FRONT = 103;

protected static final int ADD_BANK_SIDE = 104;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mContentResolver = getContentResolver();

//判断 activity被销毁后 有没有数据被保存下来

if (savedInstanceState != null) {

volue =savedInstanceState.getInt("volue");

Log.i("123---savedInstanceState", "图片拍摄成功");

finish();

} else {

Log.i("123---savedInstanceState", "图片拍摄失败");

}

init();

}

private void init(){

lifttob = (ImageView) findViewById(R.id.btn_real_name_authentication_add_id_card_front);

righttob = (ImageView) findViewById(R.id.btn_real_name_authentication_add_id_card_side);

liftbom = (ImageView) findViewById(R.id.btn_bank_front);

rightbom = (ImageView) findViewById(R.id.btn_bank_side);

lifttob.setOnClickListener(this);

righttob.setOnClickListener(this);

rightbom.setOnClickListener(this);

liftbom.setOnClickListener(this);

}

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

switch (v.getId()) {

//按钮启动相机
volue赋值

case R.id.btn_real_name_authentication_add_id_card_front:

volue=1;

Intent intent = new Intent(MainActivity.this,

UseCameraActivity.class);

startActivityForResult(intent, ADD_ID_CARD_FRONT);

break;

case R.id.btn_real_name_authentication_add_id_card_side:

volue =2;

Intent intent1 = new Intent(MainActivity.this,

UseCameraActivity.class);

startActivityForResult(intent1, ADD_ID_CARD_SIDE);

break;

case R.id.btn_bank_front:

volue =3;

Intent intent2 = new Intent(MainActivity.this,

UseCameraActivity.class);

startActivityForResult(intent2, ADD_BANK_FRONT);

break;

case R.id.btn_bank_side:

volue =4;

Intent intent3 = new Intent(MainActivity.this,

UseCameraActivity.class);

startActivityForResult(intent3, ADD_BANK_SIDE);

break;

default:

break;

}

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

switch (requestCode) {

case ADD_ID_CARD_FRONT:

if(volue==1){

String path = data.getStringExtra(UseCameraActivity.IMAGE_PATH);

Log.i("123", path);

// 根据照片的位置获取图片

Bitmap bitmap = getBitmap(path);

Drawable dra = new BitmapDrawable(bitmap);

lifttob.setImageBitmap(bitmap);

}

break;

case ADD_ID_CARD_SIDE:

if(volue==2){

String path1 = data.getStringExtra(UseCameraActivity.IMAGE_PATH);

Bitmap bitmap1 = getBitmap(path1);

righttob.setImageBitmap(bitmap1);

}

case ADD_BANK_FRONT:

if(volue==3){

String path2 = data.getStringExtra(UseCameraActivity.IMAGE_PATH);

Bitmap bitmap2 = getBitmap(path2);

liftbom.setImageBitmap(bitmap2);

}

case ADD_BANK_SIDE:

if(volue==4){

String path3 = data.getStringExtra(UseCameraActivity.IMAGE_PATH);

Bitmap bitmap3 = getBitmap(path3);

rightbom.setImageBitmap(bitmap3);

}

break;

default:

super.onActivityResult(requestCode, resultCode, data);

break;

}

}

@Override

public void onConfigurationChanged(Configuration newConfig)

{

super.onConfigurationChanged(newConfig);

/* if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)

{

//land

}

else*/ if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)

{

//port

}

}

private Uri getImageUri(String path) {

return Uri.fromFile(new File(path));

}

private Bitmap getBitmap(String path) {

Uri uri = getImageUri(path);

InputStream in = null;

try {

in = mContentResolver.openInputStream(uri);

// Decode image size

BitmapFactory.Options o = new BitmapFactory.Options();

o.inJustDecodeBounds = true;

BitmapFactory.decodeStream(in, null, o);

in.close();

//根据图片尺寸设置屏幕显示大小 o2.inSampleSize
= scale; 也可以设置固定值 比如10

int scale = 1;

if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) {

scale = (int) Math.pow(

2,

(int) Math.round(Math.log(IMAGE_MAX_SIZE

/ (double) Math.max(o.outHeight, o.outWidth))

/ Math.log(0.5)));

}

BitmapFactory.Options o2 = new BitmapFactory.Options();

o2.inSampleSize = scale;

in = mContentResolver.openInputStream(uri);

Bitmap b = BitmapFactory.decodeStream(in, null, o2);

in.close();

return b;

} catch (FileNotFoundException e) {

Log.e(TAG, "file " + path + " not found");

} catch (IOException e) {

Log.e(TAG, "file " + path + " not found");

}

return null;

}

//存入调用相机设置的volue值 为了防止图片设置重复

@Override

protected void onSaveInstanceState(Bundle outState) {

super.onSaveInstanceState(outState);

outState.putInt("volue", volue );

}

}