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EditActivity.java
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EditActivity.java
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package com.example.note;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;
import android.Manifest;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class EditActivity extends AppCompatActivity {
public static final int TAKE_PHOTO = 1;
private static final int CHOICE_PHOTO=2;
private EditText etTitle, etContent, etAuthor;
private Uri imageUri;
private Button butEditPicC,butEditPicP;
private ImageView imgV;
private DatabaseHelper DB;
private File img;
private String id;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
etTitle = findViewById(R.id.edit_EditText_title);
etAuthor = findViewById(R.id.edit_EditText_author);
etContent = findViewById(R.id.edit_EditText_Content);
butEditPicC = findViewById(R.id.button_editC);
butEditPicP = findViewById(R.id.button_editP);
imgV = findViewById(R.id.imageViewEdit);
initData(); //查询数据的
butEditPicC.setOnClickListener(new View.OnClickListener() { //打开相机
@Override
public void onClick(View v) {
img = new File(getExternalCacheDir(), getTime() + ".jpg"); //放入应用关联缓存目录,可以跳过权限
try {
if (img.exists()){
img.delete();
}
img.createNewFile();
}catch (IOException e){
e.printStackTrace();
}
if (Build.VERSION.SDK_INT>=24){
imageUri= FileProvider.getUriForFile(EditActivity.this,"com.example.takephoto.fileprovider",img); //封装Uri
}
else {
imageUri = Uri.fromFile(img); //版本低于7.0时,标识了本地的真实路径
}
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, 1); //会有返回结果
}
});
butEditPicP.setOnClickListener(new View.OnClickListener() { //打开相册
@Override
public void onClick(View v) {
if (ContextCompat.checkSelfPermission(EditActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(EditActivity.this, new String[]{ Manifest.permission.WRITE_EXTERNAL_STORAGE }, 1);
} else {
openAlbum();
}
}
});
}
private void initData() { //接受控件中的id值,进行数据库查询
/*SharedPreferences pref = getSharedPreferences("author", MODE_PRIVATE);//查询数据
String name = pref.getString("name", "金子潇");*/
DB = new DatabaseHelper(this);
Intent intent = getIntent();
id = (String) intent.getSerializableExtra("id"); //接收到传来的id
Cursor cursor=DB.queryFromDbById(id);
if(cursor.moveToFirst()){
@SuppressLint("Range") String select_title=cursor.getString(cursor.getColumnIndex("title"));
@SuppressLint("Range") String select_author=cursor.getString(cursor.getColumnIndex("author"));
@SuppressLint("Range") String select_content=cursor.getString(cursor.getColumnIndex("content"));
etTitle.setText(select_title);
etAuthor.setText(select_author);
etContent.setText(select_content);
@SuppressLint("Range") byte[] in = cursor.getBlob(cursor.getColumnIndex("picture"));
Bitmap bitmap=BitmapFactory.decodeByteArray(in,0,in.length);
imgV.setImageBitmap(bitmap);
}
}
//打开系统相册
private void openAlbum(){ //打开系统相册
Intent intent = new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
startActivityForResult(intent,CHOICE_PHOTO);
}
//
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults){
switch (requestCode){
case 1:
if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
openAlbum();
}else {
Toast.makeText(this,"You denied the permission",Toast.LENGTH_SHORT).show();
}
break;
default:
}
}
@TargetApi(19)
private void handleImageOnKitKat(Intent data){ //对图片进行解析
String imagePath = null;
Uri uri =data.getData();
if(DocumentsContract.isDocumentUri(this,uri)){ //如果是document类型的Uri,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]; //解析出数字格式的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content类型的Uri,则用普通方式处理
imagePath = getImagePath(uri,null);
}else if("file".equalsIgnoreCase(uri.getScheme())){ //如果是file类型的Uri,直接获取图片路径
imagePath = uri.getPath();
}
displayImage(imagePath); //根据路径显示图片
}
private void handleImageBeforeKitKat(Intent data){ //图片显示前对图片进行解析
Uri uri = data.getData();
String imagePath = getImagePath(uri,null);
displayImage(imagePath);
}
@SuppressLint("Range")
private String getImagePath(Uri uri, String selection){ //获取图片的真实路径
String path = null;
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){ //显示照片
if(imagePath != null){
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
imgV.setImageBitmap(bitmap);
}else{
Toast.makeText(this,"failed to get image", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { //根据系统路径显示文件
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case TAKE_PHOTO:
if (requestCode == 1) {
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
imgV.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
break;
case CHOICE_PHOTO:
if (resultCode == RESULT_OK) { //判断手机版本号
if (Build.VERSION.SDK_INT >= 19) { //安卓4.4以上用这个方法处理照片
handleImageOnKitKat(data);
} else { //安卓4.4以下用这个方法处理照片
handleImageBeforeKitKat(data);
}
}
break;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) { //菜单项
getMenuInflater().inflate(R.menu.menu_edit, menu); //添加布局
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.menu_save: //保存按钮操作
ContentValues values = new ContentValues();
String title = etTitle.getText().toString(); //获取控件中的数据
String author = etAuthor.getText().toString();
String content = etContent.getText().toString();
values.put("id", id);//存数据
values.put("title", title);
values.put("author", author);
values.put("content", content);
values.put("time", getTime());
final ByteArrayOutputStream os = new ByteArrayOutputStream(); //存照片
Bitmap bitmap = ((BitmapDrawable)imgV.getDrawable()).getBitmap();
bitmap.compress(Bitmap.CompressFormat.PNG,100,os);
values.put("picture",os.toByteArray());
if (TextUtils.isEmpty(title)) {
Toast.makeText(EditActivity.this, "标题不能为空", Toast.LENGTH_SHORT).show();
} else {
int row = DB.updataData(values, id); //调用数据库类的修改数据的方法
values.clear();
if (row != -1){
Toast.makeText(EditActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
this.finish();
} else {
Toast.makeText(EditActivity.this, "修改失败", Toast.LENGTH_SHORT).show();
}
}
break;
case R.id.menu_edit_cancel:
Intent intent = new Intent(EditActivity.this, MainActivity.class);
startActivity(intent);
break;
}
return super.onOptionsItemSelected(item);
}
public String getTime() { //获取系统时间
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss"); //重置格式
Date date = new Date();
String time = simpleDateFormat.format(date); //获取系统时间
return time;
}
}