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Android 实例讲解添加本地图片和调用系统拍照图片
在项目的开发过程我们离不开图片,而有时候需要调用本地的图片,有时候需要调用拍照图片。同时实现拍照的方法有两种,一种是调用系统拍照功能,另一种是自定义拍照功能。而本博文目前只讲解第一种方法,第二种方法后期在加以讲解。
添加本地图片和调用系统拍照图片主要是通过调用acitivity跳转startActivityForResult(Intent intent, int requestCode)方法和activity返回结果onActivityResult(int requestCode, int resultCode, Intent data)方法来实现的。具体实现代码如下:
一.添加本地图片
1.
Intent intent = new Intent(); /* 开启Pictures画面Type设定为image */ intent.setType(IMAGE_TYPE); /* 使用Intent.ACTION_GET_CONTENT这个Action */ intent.setAction(Intent.ACTION_GET_CONTENT); /* 取得相片后返回本画面 */ startActivityForResult(intent, LOCAL_IMAGE_CODE);</span>2.
Uri uri = data.getData(); url = uri.toString().substring(uri.toString().indexOf("///") + 2); if (url.contains(".jpg") && url.contains(".png")) { Toast.makeText(this, "请选择图片", Toast.LENGTH_SHORT).show(); return; } bitmap = HelpUtil.getBitmapByUrl(url);
二.调用系统拍照图片
1.
String fileName = "IMG_" + curFormatDateStr + ".png"; Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(new File(rootUrl, fileName))); intent.putExtra("fileName", fileName); startActivityForResult(intent, CAMERA_IMAGE_CODE);
2.
<span style="font-size:18px;"><span style="white-space:pre"> </span>url = rootUrl + "/" + "IMG_" + curFormatDateStr + ".png"; bitmap = HelpUtil.getBitmapByUrl(url); showImageIv.setImageBitmap(HelpUtil.createRotateBitmap(bitmap));</span>
注意:由于拍照所得图片放在ImageView中自动逆时针旋转了90度,当显示的实现需要顺时针旋转90度,达到正常显示水平,方法如下
/** * bitmap旋转90度 * * @param bitmap * @return */ public static Bitmap createRotateBitmap(Bitmap bitmap) { if (bitmap != null) { Matrix m = new Matrix(); try { m.setRotate(90, bitmap.getWidth() / 2, bitmap.getHeight() / 2);// 90就是我们需要选择的90度 Bitmap bmp2 = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m, true); bitmap.recycle(); bitmap = bmp2; } catch (Exception ex) { System.out.print("创建图片失败!" + ex); } } return bitmap; }
三.实例给出整个效果的详细代码
1.效果图
2.布局文件activity_main.xml
<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" > <LinearLayout android:id="@+id/id_insert_btns_ll" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:orientation="horizontal" > <Button android:id="@+id/id_local_img_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="插入本地图片" /> <Button android:id="@+id/id_camera_img_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="插入拍照图片" /> </LinearLayout> <TextView android:id="@+id/id_show_url_tv" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:layout_alignParentBottom="true" android:textColor="#FF0000" android:text="显示图片路径" /> <ImageView android:id="@+id/id_image_iv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/id_insert_btns_ll" android:layout_above="@id/id_show_url_tv" android:layout_centerHorizontal="true" /> </RelativeLayout>
3.主类文件MainActivity.java
package com.example.insertimagedemo; import java.io.File; import java.util.Calendar; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; 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 android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { private static final int LOCAL_IMAGE_CODE = 1; private static final int CAMERA_IMAGE_CODE = 2; private static final String IMAGE_TYPE = "image/*"; private String rootUrl = null; private String curFormatDateStr = null; private Button localImgBtn, cameraImgBtn; private TextView showUrlTv; private ImageView showImageIv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findById(); initData(); } /** * 初始化view */ private void findById() { localImgBtn = (Button) this.findViewById(R.id.id_local_img_btn); cameraImgBtn = (Button) this.findViewById(R.id.id_camera_img_btn); showUrlTv = (TextView) this.findViewById(R.id.id_show_url_tv); showImageIv = (ImageView) this.findViewById(R.id.id_image_iv); localImgBtn.setOnClickListener(this); cameraImgBtn.setOnClickListener(this); } /** * 初始化相关data */ private void initData() { rootUrl = Environment.getExternalStorageDirectory().getPath(); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.id_local_img_btn: processLocal(); break; case R.id.id_camera_img_btn: processCamera(); break; } } /** * 处理本地图片btn事件 */ private void processLocal() { Intent intent = new Intent(); /* 开启Pictures画面Type设定为image */ intent.setType(IMAGE_TYPE); /* 使用Intent.ACTION_GET_CONTENT这个Action */ intent.setAction(Intent.ACTION_GET_CONTENT); /* 取得相片后返回本画面 */ startActivityForResult(intent, LOCAL_IMAGE_CODE); } /** * 处理camera图片btn事件 */ private void processCamera() { curFormatDateStr = HelpUtil.getDateFormatString(Calendar.getInstance() .getTime()); String fileName = "IMG_" + curFormatDateStr + ".png"; Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(rootUrl, fileName))); intent.putExtra("fileName", fileName); startActivityForResult(intent, CAMERA_IMAGE_CODE); } /** * 处理Activity跳转后返回事件 */ @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { String url = ""; Bitmap bitmap = null; if (requestCode == LOCAL_IMAGE_CODE) { Uri uri = data.getData(); url = uri.toString().substring( uri.toString().indexOf("///") + 2); Log.e("uri", uri.toString()); if (url.contains(".jpg") && url.contains(".png")) { Toast.makeText(this, "请选择图片", Toast.LENGTH_SHORT).show(); return; } bitmap = HelpUtil.getBitmapByUrl(url); showImageIv.setImageBitmap(HelpUtil.getBitmapByUrl(url)); /** * 获取bitmap另一种方法 * * ContentResolver cr = this.getContentResolver(); bitmap = * HelpUtil.getBitmapByUri(uri, cr); */ } else if (requestCode == CAMERA_IMAGE_CODE) { url = rootUrl + "/" + "IMG_" + curFormatDateStr + ".png"; bitmap = HelpUtil.getBitmapByUrl(url); showImageIv.setImageBitmap(HelpUtil.createRotateBitmap(bitmap)); /** * 获取bitmap另一种方法 * * File picture = new File(url); * Uri uri = Uri.fromFile(picture); * ContentResolver cr = this.getContentResolver(); * bitmap = HelpUtil.getBitmapByUri(uri, cr); */ } showUrlTv.setText(url); } else { Toast.makeText(this, "没有添加图片", Toast.LENGTH_SHORT).show(); } } }
4.帮助类文件HelpUtil.java
package com.example.insertimagedemo; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import android.annotation.SuppressLint; import android.content.ContentResolver; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.net.Uri; public class HelpUtil { /** * 根据图片路径获取本地图片的Bitmap * * @param url * @return */ public static Bitmap getBitmapByUrl(String url) { FileInputStream fis = null; Bitmap bitmap = null; try { fis = new FileInputStream(url); bitmap = BitmapFactory.decodeStream(fis); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); bitmap = null; } finally { if (fis != null) { try { fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } fis = null; } } return bitmap; } /** * bitmap旋转90度 * * @param bitmap * @return */ public static Bitmap createRotateBitmap(Bitmap bitmap) { if (bitmap != null) { Matrix m = new Matrix(); try { m.setRotate(90, bitmap.getWidth() / 2, bitmap.getHeight() / 2);// 90就是我们需要选择的90度 Bitmap bmp2 = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m, true); bitmap.recycle(); bitmap = bmp2; } catch (Exception ex) { System.out.print("创建图片失败!" + ex); } } return bitmap; } public static Bitmap getBitmapByUri(Uri uri,ContentResolver cr){ Bitmap bitmap = null; try { bitmap = BitmapFactory.decodeStream(cr .openInputStream(uri)); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); bitmap = null; } return bitmap; } /** * 获取格式化日期字符串 * @param date * @return */ @SuppressLint("SimpleDateFormat") public static String getDateFormatString(Date date) { if (date == null) date = new Date(); String formatStr = new String(); SimpleDateFormat matter = new SimpleDateFormat("yyyyMMdd_HHmmss"); formatStr = matter.format(date); return formatStr; } }
以前就是本博文所有内容,谢谢品读。
源码地址:http://download.csdn.net/detail/a123demi/8027697Android 实例讲解添加本地图片和调用系统拍照图片
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