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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.
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- 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.
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- 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.
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- 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.
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- url = rootUrl + "/" + "IMG_" + curFormatDateStr + ".png";
- bitmap = HelpUtil.getBitmapByUrl(url);
- showImageIv.setImageBitmap(HelpUtil.createRotateBitmap(bitmap));
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
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- /**
- * 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
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- <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
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- 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
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- 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;
- }
Android 实例讲解添加本地图片和调用系统拍照图片
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