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本次博客主要讲解利用开发的
<LinearLayout
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#00B8D4">
<ImageView
android:layout_width="match_parent"
android:layout_height="200dp"
android:src="@drawable/view1"
android:id="@+id/image"/>
</LinearLayout>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="拍个照片吧!"
android:onClick="takePicture"
android:id="@+id/save"/>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:descendantFocusability="blocksDescendants"
android:id="@+id/imageList"/>
以上设计的界面的效果如下图所示:
将图片保存到手机内存中主要是利用sd卡的保存,目前大多数手机已经是内置的sd卡,这里我们主要讲解这种方法:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
自己创建一个名为imageAdapter的java类,进行适配器的自定义:
public View getView(int i, View view, ViewGroup viewGroup) { View v =View.inflate(stuContext,R.layout.myspinner_item,null); Map<String,Object> tupian = (Map<String,Object> )a.get(i); ImageView image = (ImageView) v.findViewById(R.id.image); TextView nameText = (TextView) v.findViewById(R.id.name); //设置图片信息 String name = tupian.get("name").toString(); //拿到图片的名字 nameText.setText(name); //设置图片 String imagepath=(String)tupian.get("imagePath"); Bitmap bitmap = BitmapFactory.decodeFile(imagepath);//此处放路径名 image.setImageBitmap(bitmap); //设置标识符 image.setTag(i); return v; } }
private int TAKE_PHOTO=1; //拍照 private int GET_PHOTO=2; //取照片 private ListView imageList; public imageAdapter imageAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_work42); exitSD(); imageList=(ListView)findViewById(R.id.imageList); imageAdapter(); ///为配置器设置一个自定义的item内部控件的点击监听 imageAdapter.setOnInnerItemOnClickListener(this); imageAdapter.notifyDataSetChanged(); imageList.setAdapter(imageAdapter); imageList.setOnItemClickListener(this); }
private void imageAdapter(){
imageAdapter = new imageAdapter(this,getDatas());
}
private void exitSD() {
//获取存储卡状态
String state = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(state)){
Toast.makeText(this, "有SD卡 ", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, "没有SD卡 ", Toast.LENGTH_SHORT).show();
}
}
用来记录拍照的时间,这个图片的详细信息可以查看到的内容,也是必要的一步
public String timee(){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss");// HH:mm:ss
Date date = new Date(System.currentTimeMillis());
return simpleDateFormat.format(date);
}
通过拍照按钮、调用手机的摄像机进行拍照
public void takePicture(View view) {
Intent mIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(mIntent,TAKE_PHOTO);
}
获取系统的存储空间的代码如下:
imagePath=Environment.getExternalStorageDirectory().getPath()//此语句用来获取手机的存储空间
将拍照好的图片保存到我们设置路径imagePath=Environment.getExternalStorageDirectory().getPath()+"/service" 下面;
public void saveImageSd(Bitmap bitmap, String fileName){ FileOutputStream fos=null; if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ String imagePath=Environment.getExternalStorageDirectory().getPath()+"/service"; try { File file=new File(imagePath,fileName+".jpg"); System.out.println(file.getPath()); fos=new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG,100,fos); fos.flush(); Toast.makeText(this,"图片保存成功"+imagePath,Toast.LENGTH_SHORT).show(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } /* 通过广播更新图片管理 */ Intent intent=new Intent(); intent.setAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri uri = Uri.parse("file://"+imagePath+fileName); intent.setData(uri); this.sendBroadcast(intent); } }
listview读取图片保存路径中的图片,然后显示到listview上面:
private List<Map<String,Object>> getDatas() { List<Map<String,Object>> list = new ArrayList<Map<String,Object>>(); String sdpath = ""; sdpath = Environment.getExternalStorageDirectory().getPath(); sdpath = sdpath+"/service/"; File file = new File(sdpath); if (!file.exists()) { //文件不存在 return null; } else{ //获取以jpg为后缀的图片 File[] files = file.listFiles(new FilenameFilter() { // 找到匹配的图片 public boolean accept(File dir, String filename) { return filename.endsWith(".jpg"); } }); //将图片装载到List中,方便ListView进行显示 for (int i = 0; i <files.length; i++) { Map<String, Object> map = new HashMap<String, Object>(); String imagePath = sdpath+files[i].getName(); map.put("imagePath",imagePath); map.put("name",files[i].getName()); list.add(map); } System.out.println("装载了"+files.length+"张照片"); return list; } }
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" android:orientation="vertical" tools:context=".work42"> <LinearLayout android:layout_width="match_parent" android:layout_height="200dp" android:background="#00B8D4"> <ImageView android:layout_width="match_parent" android:layout_height="200dp" android:src="@drawable/view1" android:id="@+id/image"/> </LinearLayout> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="拍个照片吧!" android:onClick="takePicture" android:id="@+id/save"/> <ListView android:layout_width="match_parent" android:layout_height="wrap_content" android:descendantFocusability="blocksDescendants" android:id="@+id/imageList"/> </LinearLayout>
package *******;//填写自己的项目包名 import androidx.appcompat.app.AppCompatActivity; import androidx.core.content.FileProvider; 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.os.StrictMode; import android.provider.MediaStore; import android.text.format.DateFormat; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.Toast; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FilenameFilter; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Locale; import java.util.Map; public class work42 extends AppCompatActivity implements imageAdapter.InnerItemOnClickListener, AdapterView.OnItemClickListener{ private int TAKE_PHOTO=1; //拍照 private int GET_PHOTO=2; //取照片 private ListView imageList; public imageAdapter imageAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_work42); exitSD(); imageList=(ListView)findViewById(R.id.imageList); imageAdapter(); ///为配置器设置一个自定义的item内部控件的点击监听 imageAdapter.setOnInnerItemOnClickListener(this); imageAdapter.notifyDataSetChanged(); imageList.setAdapter(imageAdapter); imageList.setOnItemClickListener(this); } private void imageAdapter(){ imageAdapter = new imageAdapter(this,getDatas()); } private void exitSD() { //获取存储卡状态 String state = Environment.getExternalStorageState(); if(Environment.MEDIA_MOUNTED.equals(state)){ Toast.makeText(this, "有SD卡 ", Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(this, "没有SD卡 ", Toast.LENGTH_SHORT).show(); } } //一下函数是系统自动生成的,主要用来将拍摄的照片显示到我们的图片框上面 @Override protected void onActivityResult(int requestCode,int resultCode,Intent data){ super.onActivityResult(requestCode,resultCode,data); if (resultCode == RESULT_OK) { //回传值接受成功 if (requestCode == TAKE_PHOTO) { //拍照取图 Bundle bundle = data.getExtras(); //获取data数据集合 Bitmap bitmap = (Bitmap) bundle.get("data"); //获得data数据 saveImageSd(bitmap,"此刻"+timee());//存图 imageAdapter(); imageList.setAdapter(imageAdapter); imageAdapter.notifyDataSetChanged(); } } } public String timee(){ SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss");// HH:mm:ss Date date = new Date(System.currentTimeMillis()); return simpleDateFormat.format(date); } @Override public void itemClick(View view) { } @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { Toast.makeText(work42.this,"此刻,最美的记忆!",Toast.LENGTH_SHORT).show(); } public void takePicture(View view) { Intent mIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(mIntent,TAKE_PHOTO); } public void saveImageSd(Bitmap bitmap, String fileName){ FileOutputStream fos=null; if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ String imagePath=Environment.getExternalStorageDirectory().getPath()+"/service"; try { File file=new File(imagePath,fileName+".jpg"); System.out.println(file.getPath()); fos=new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG,100,fos); fos.flush(); Toast.makeText(this,"图片保存成功"+imagePath,Toast.LENGTH_SHORT).show(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } /* 通过广播更新图片管理 */ Intent intent=new Intent(); intent.setAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri uri = Uri.parse("file://"+imagePath+fileName); intent.setData(uri); this.sendBroadcast(intent); } } private List<Map<String,Object>> getDatas() { List<Map<String,Object>> list = new ArrayList<Map<String,Object>>(); String sdpath = ""; sdpath = Environment.getExternalStorageDirectory().getPath(); sdpath = sdpath+"/service/"; File file = new File(sdpath); if (!file.exists()) { //文件不存在 return null; } else{ //获取以jpg为后缀的图片 File[] files = file.listFiles(new FilenameFilter() { // 找到匹配的图片 public boolean accept(File dir, String filename) { return filename.endsWith(".jpg"); } }); //将图片装载到List中,方便ListView进行显示 for (int i = 0; i <files.length; i++) { Map<String, Object> map = new HashMap<String, Object>(); String imagePath = sdpath+files[i].getName(); map.put("imagePath",imagePath); map.put("name",files[i].getName()); list.add(map); } System.out.println("装载了"+files.length+"张照片"); return list; } } }
package *****;//填写自己的项目包名 import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; import java.util.List; import java.util.Map; public class imageAdapter extends BaseAdapter implements View.OnClickListener { private Context stuContext; private InnerItemOnClickListener myListener; private List a; public imageAdapter(Context context,List list){ this.stuContext=context; this.a=list; } @Override public void onClick(View view) { myListener.itemClick(view); } @Override public int getCount() { return a.size(); } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return i; } @Override public View getView(int i, View view, ViewGroup viewGroup) { View v =View.inflate(stuContext,R.layout.myspinner_item,null); Map<String,Object> tupian = (Map<String,Object> )a.get(i); ImageView image = (ImageView) v.findViewById(R.id.image); TextView nameText = (TextView) v.findViewById(R.id.name); //设置图片信息 String name = tupian.get("name").toString(); //拿到图片的名字 nameText.setText(name); //设置图片 String imagepath=(String)tupian.get("imagePath"); Bitmap bitmap = BitmapFactory.decodeFile(imagepath);//此处放路径名 image.setImageBitmap(bitmap); //设置标识符 image.setTag(i); return v; } interface InnerItemOnClickListener { abstract void itemClick(View view); } public void setOnInnerItemOnClickListener(InnerItemOnClickListener listener){ this.myListener=listener; } }
以上就是本次博客的全部内容啦,感谢大家的收看哦,欢迎大家留言评论、点赞讨论哦!
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