使用内置的Camera应用程序
2016-03-22 22:24
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该小节非常简单,讲的就三件事:
一,调用Camera相机拍照并获取照片;
二、调用Camera相机拍照并获得原图;
三、获得原图后根据屏幕的宽高比来显示图片。
调用Camera相机拍照并获取照片源码如下:
package com.hhqy.withme;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.ImageView;
public class ContextActivity extends FragmentActivity {
private ImageView image; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_context); image = (ImageView)findViewById(R.id.cursor); Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); //android.provider.MediaStore.ACTION_IMAGE_CAPTURE //打开相机的意图 startActivityForResult(intent, 100); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) { super.onActivityResult(requestCode, resultCode, intent); if(requestCode == 100 && resultCode == RESULT_OK) { Bundle bundle = intent.getExtras(); image.setImageBitmap((Bitmap)bundle.get("data")); } }
}
布局文件只有一个imageView控件,所以就不写了,后面一样!
通过运行你会发现图片缩小了
那如何获得原图大小呢?书中给的代码是这样的:
package com.hhqy.withme;
import java.io.File;
import java.util.ArrayList;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.Menu;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class ContextActivity extends FragmentActivity {
private ImageView image; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_context); image = (ImageView)findViewById(R.id.cursor); String path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/hello.jpg"; Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(path))); //也可这样写uri:Uri.parse("file:///sdcard/hello.jpg"),但是上一种更规范一些 startActivityForResult(intent, 100); } @Override protected void onActivityResult(int arg0, int arg1, Intent arg2) { super.onActivityResult(arg0, arg1, arg2); if(arg1 == RESULT_OK) { Bundle bundle = arg2.getExtras(); image.setImageBitmap((Bitmap)bundle.get("data")); } }
}
但是一运行的时候,你会发现拿不到图片了!!
后来上网查询了一下,我们可以通过文件名来获取,直接取是取不到了,修改一小段:
@Override
protected void onActivityResult(int arg0, int arg1, Intent arg2)
{
super.onActivityResult(arg0, arg1, arg2);
if(arg1 == RESULT_OK)
{
Bundle bundle = arg2.getExtras();
image.setImageBitmap((Bitmap)bundle.get(“data”));
BitmapFactory.Options option = new BitmapFactory.Options(); option.inJustDecodeBounds = false; Bitmap bitmapTure = BitmapFactory.decodeFile( Environment.getExternalStorageDirectory().getAbsolutePath()+"/hello.jpg", option); image.setImageBitmap(bitmapTure); } } ![这里还是不行,具体原因我也不知道了,或许是时间的原因请知道的朋友指教!最后还是贴上能运行的代码:](http://img.blog.csdn.net/20160426235309571) 效果大家可以自己试一下,我只是随手拍的! 最后,图片太大了,如何根据屏幕的宽高比来显示图片呢?不说话,上源码: package com.hhqy.withme;
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.support.v4.app.FragmentActivity;
import android.view.Display;
import android.widget.ImageView;
public class ContextActivity extends FragmentActivity {
private ImageView image; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_context); image = (ImageView)findViewById(R.id.cursor); String path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/hello.jpg"; Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, Uri.parse("file:///sdcard/hello.jpg")); startActivityForResult(intent, 100); } @Override protected void onActivityResult(int arg0, int arg1, Intent arg2) { super.onActivityResult(arg0, arg1, arg2); if(arg1 == RESULT_OK) {
// Bundle bundle = arg2.getExtras();
// image.setImageBitmap((Bitmap)bundle.get(“data”));
Display display = getWindowManager().getDefaultDisplay();
int dw = display.getWidth();//窗口宽度
int dh = display.getHeight();//窗口高度
BitmapFactory.Options option = new BitmapFactory.Options(); option.inJustDecodeBounds = true;//只加载图像尺寸,而不用加载图像本身,例如只问参加活动的人数,而不问具体哪些人参加一样! Bitmap bitmapFalse = BitmapFactory.decodeFile( Environment.getExternalStorageDirectory().getAbsolutePath()+"/hello.jpg", option); int hRatio = (int) Math.ceil(option.outHeight/dh); int wRatio = (int) Math.ceil(option.outWidth/dw); if(hRatio>1 && wRatio>1) { if(hRatio>wRatio) { option.inSampleSize = hRatio; }else { option.inSampleSize = wRatio; } } option.inJustDecodeBounds = false; Bitmap bitmapTure = BitmapFactory.decodeFile( Environment.getExternalStorageDirectory().getAbsolutePath()+"/hello.jpg", option); image.setImageBitmap(bitmapTure);
// ContentResolver c = this.getContentResolver();
// try {
// Bitmap bmp = BitmapFactory.decodeStream(c.openInputStream(Uri.parse(“file:///sdcard/hello.jpg”)));
// if(bmp!=null)image.setImageBitmap(bmp);
// } catch (FileNotFoundException e) {
// Toast.makeText(this, “图片取出来有问题”, Toast.LENGTH_SHORT).show();
// e.printStackTrace();
// }
}
}
}
重点不是我照片拍的丑,重点是技术的实现和熟练,欢迎大家交流:QQ3332168769
(我至今也不明白为什么给了一个uri之后为什么会取不出来图片这个问题,求指教!!!)
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