本文实例讲述了Android开发实现ListView和adapter配合显示图片和文字列表功能。分享给大家供大家参考,具体如下: 实际效果: 布局文件: xml version="1.0" encoding="utf-8"RelativeLayout xmlns:andr
本文实例讲述了Android开发实现ListView和adapter配合显示图片和文字列表功能。分享给大家供大家参考,具体如下:
实际效果:
布局文件:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" android:orientation="vertical"> <!--使用红色得分割条--> <ListView android:id="@+id/list1" android:layout_width="match_parent" android:layout_height="wrap_content" android:divider="#f00" android:dividerHeight="2px" android:headerDividersEnabled="false"> </ListView> <!--用于存放和发送新的信息--> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="0dp" android:background="#66ffffff" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <!--设置最大行数--> <EditText android:id="@+id/ifo_edit" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入内容" android:maxLines="6" android:textColorHint="#c0c0c0" /> <!--存放新的图片--> <ImageView android:id="@+id/ifo_image" android:layout_width="130dp" android:layout_height="110dp" android:src="@drawable/addphoto" /> </LinearLayout> <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content"> <!--点击取消发送消息--> <Button android:id="@+id/delete" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_gravity="left" android:text="取消" android:textSize="16sp" /> <!--点击发送消息--> <Button android:id="@+id/send" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:text="发送" android:textSize="16sp" /> </RelativeLayout> </LinearLayout> </RelativeLayout>
代码实现部分:
public class MainActivity extends AppCompatActivity { //list表 private List<Informations> informationsList01 = new ArrayList<>(); //当前消息列表 ListView list01 ; //消息发送栏 EditText editText01 ; //存放图片 ImageView imageView01; //消息发送按钮 Button button01_send ; //记录数组长度 int arr_num = 0; //定义一个数组 String[] arr1 = new String[arr_num]; //从相册获得图片 Bitmap bitmap; //判断返回到的Activity private static final int IMAGE_REQUEST_CODE = 0; //图片路径 private String path ; private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { if((Integer)msg.obj==0){ imageView01.setImageBitmap(bitmap); } super.handleMessage(msg); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); list01 = (ListView) findViewById(R.id.list1); editText01 = (EditText) findViewById(R.id.ifo_edit); imageView01 = (ImageView) findViewById(R.id.ifo_image); button01_send = (Button) findViewById(R.id.send); imageView01.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){ ActivityCompat.requestPermissions(MainActivity.this,new String[]{ Manifest.permission.WRITE_EXTERNAL_STORAGE },1); } Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, IMAGE_REQUEST_CODE); } }); button01_send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(((BitmapDrawable) ((ImageView) imageView01).getDrawable()).getBitmap() != null || editText01.getText().toString() != null){ Informations xiaochouyu = new Informations( ((BitmapDrawable) ((ImageView) imageView01).getDrawable()).getBitmap(), editText01.getText().toString()); informationsList01.add(xiaochouyu); EssayAdapter adapter = new EssayAdapter(MainActivity.this, R.layout.array_list,informationsList01); list01.setAdapter(adapter); editText01.setText(""); imageView01.setImageBitmap(null); imageView01.setImageResource(R.drawable.addphoto); } } }); } /*定义一个Handler,定义延时执行的行为*/ public void chnage(){ new Thread(){ @Override public void run() { while ( bitmap == null ){ bitmap = BitmapFactory.decodeFile(path); Log.v("qwe","123"); } Message message = handler.obtainMessage(); message.obj = 0; handler.sendMessage(message); } }.start(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); //在相册里面选择好相片之后调回到现在的这个activity中 switch (requestCode) { case IMAGE_REQUEST_CODE://这里的requestCode是我自己设置的,就是确定返回到那个Activity的标志 if (resultCode == RESULT_OK) {//resultcode是setResult里面设置的code值 try { Uri selectedImage = data.getData(); //获取系统返回的照片的Uri String[] filePathColumn = {MediaStore.Images.Media.DATA}; Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);//从系统表中查询指定Uri对应的照片 cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(filePathColumn[0]); path = cursor.getString(columnIndex); //获取照片路径 cursor.close(); BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 1; bitmap = BitmapFactory.decodeFile(path,options); imageView01.setImageBitmap(bitmap); chnage(); Toast.makeText(MainActivity.this,path,Toast.LENGTH_SHORT).show(); } catch (Exception e) { // TODO Auto-generatedcatch block e.printStackTrace(); } } break; } } @TargetApi(19) private void handleImageOmKitKat(Intent data){ String imagePath = null; Uri uri = data.getData(); if (DocumentsContract.isDocumentUri(this,uri)){ //如果document类型是U日,则通过document id处理 String docId = DocumentsContract.getDocumentId(uri); if ("com.android.providers.media.documents".equals(uri.getAuthority())){ String id = docId.split(":")[1];//解析出数字格式id String selection = MediaStore.Images.Media._ID + "=" + id; imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection); }else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())){ Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),Long.valueOf(docId)); imagePath = getImagePath(contentUri,null); } }else if ("content".equalsIgnoreCase(uri.getScheme())){ //如果是普通类型 用普通方法处理 imagePath = getImagePath(uri,null); }else if ("file".equalsIgnoreCase(uri.getScheme())){ //如果file类型位uri直街获取图片路径即可 imagePath = uri.getPath(); } displayImage(imagePath); } private void handleImageBeforeKitKat(Intent data){ Uri uri = data.getData(); String imagePath = getImagePath(uri,null); displayImage(imagePath); } private String getImagePath(Uri uri, String selection){ String path = null; //通过Uri和selection来获取真实图片路径 Cursor cursor = getContentResolver().query(uri, null, selection, null, null); if (cursor != null){ if (cursor.moveToFirst()){ path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); } cursor.close(); } return path; } private void displayImage(String imagePath){ if (imagePath != null){ Bitmap bitmap = BitmapFactory.decodeFile(imagePath); imageView01.setImageBitmap(bitmap); }else { Toast.makeText(MainActivity.this,"fail to get image",Toast.LENGTH_SHORT).show(); } } }
Adapter 配试器:
public class EssayAdapter extends ArrayAdapter<Informations> { private int resourceId; public EssayAdapter(Context context, int textViewResourceId, List<Informations> objects){ super(context, textViewResourceId, objects); resourceId = textViewResourceId; } @Override public View getView(int position, View convertView, ViewGroup parent) { Informations informations = getItem(position); View view = LayoutInflater.from(getContext()).inflate(resourceId,parent, false); ImageView informationImage = (ImageView) view.findViewById(R.id.image); TextView informationEssay = (TextView) view.findViewById(R.id.essay); informationImage.setImageBitmap(informations.getImageBitmap()); informationEssay.setText(informations.getEssay()); return view; } }
Information类:
包括 Bitmap 和 Essay 两个私有变量
public class Informations { //文体 private String essay; //图片 private Bitmap imageId; Informations(Bitmap imageId, String essay){ this.imageId = imageId; this.essay = essay; } Informations(){ this.essay = null; this.imageId = null; } public String getEssay() { return essay; } public void setEssay(String essay) { this.essay = essay; } public Bitmap getImageBitmap() { return imageId; } public void setImageBitmap(Bitmap imageId) { this.imageId = imageId; } }
权限:
<!--获取照片权限--> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
更多关于Android相关内容感兴趣的读者可查看本站专题:《Android控件用法总结》、《Android开发入门与进阶教程》、《Android视图View技巧总结》、《Android编程之activity操作技巧总结》、《Android数据库操作技巧总结》及《Android资源操作技巧汇总》
希望本文所述对大家Android程序设计有所帮助。