【软件应用开发】小米便签APP维护开发_小米便签二次开发-CSDN博客
本文章旨在对上述文章一对一详细介绍,以方便入门的萌新使用:
我们规划一下,
一。我们介绍一点小技巧:
1.搜索:双击shift可以搜索,在末尾最后一步的时候有示例。
2.自动改错:停在报错的位置,然后按Alt+Enter,会显示解决方案,然后按一下Enter即可自动修改文章,然后解决报错
3.分屏展示
4.导入图片,可以参考一下链接:Android studio导入资源,包括导入图片-CSDN博客
4.我们大概只涉及到描述部分NoteEditActivity和框架部分note_edit(MiNotes\app\src\main\java\net\micode\notes\ui\NoteEditActivity.java+++++++++MiNotes\app\src\main\res\layout\note_edit.xml)
二。我们需要准备小米便签的开源代码
三。然后开始具体操作(我截图时尽量保留下上下文,方便读者定位)
,1.首先添加按钮(路径:MiNotes\app\src\main\res\layout\note_edit.xml)
<ImageButton
android:id="@+id/add_img_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:layout_marginTop="600dp"
android:layout_marginBottom="7dp"
android:src="@android:drawable/ic_menu_gallery" />
2.然后替代原来的onCreate()方法(路径:MiNotes\app\src\main\java\net\micode\notes\ui\NoteEditActivity.java)
private final int PHOTO_REQUEST=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.note_edit);
if (savedInstanceState == null && !initActivityState(getIntent())) {
finish();
return;
}
initResources();
//根据id获取添加图片按钮
final ImageButton add_img_btn = (ImageButton) findViewById(R.id.add_img_btn);
//为点击图片按钮设置监听器
add_img_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d(TAG, "onClick: click add image button");
//ACTION_GET_CONTENT: 允许用户选择特殊种类的数据,并返回(特殊种类的数据:照一张相片或录一段音)
Intent loadImage = new Intent(Intent.ACTION_GET_CONTENT);
//Category属性用于指定当前动作(Action)被执行的环境.
//CATEGORY_OPENABLE; 用来指示一个ACTION_GET_CONTENT的intent
loadImage.addCategory(Intent.CATEGORY_OPENABLE);
loadImage.setType("image/*");
startActivityForResult(loadImage, PHOTO_REQUEST);
}
});
}
3.同时添加一块代码(路径:MiNotes\app\src\main\java\net\micode\notes\ui\NoteEditActivity.java)
//获取文件的real path
public String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
// if (isExternalStorageDocument(uri)) {
// final String docId = DocumentsContract.getDocumentId(uri);
// final String[] split = docId.split(":");
// final String type = split[0];
//
// if ("primary".equalsIgnoreCase(type)) {
// return Environment.getExternalStorageDirectory() + "/" + split[1];
// }
// }
// // DownloadsProvider
// else if (isDownloadsDocument(uri)) {
// final String id = DocumentsContract.getDocumentId(uri);
// final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
// return getDataColumn(context, contentUri, null, null);
// }
// MediaProvider
// else
if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// Media
else if ("content".equalsIgnoreCase(uri.getScheme())) {
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
//获取数据列_获取此 Uri 的数据列的值。这对MediaStore Uris 和其他基于文件的 ContentProvider。
public String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
//是否为外部存储文件
// public boolean isExternalStorageDocument(Uri uri) {
// return "com.android.externalstorage.documents".equals(uri.getAuthority());
// }
//
// //是否为下载文件
// public boolean isDownloadsDocument(Uri uri) {
// return "com.android.providers.downloads.documents".equals(uri.getAuthority());
// }
//是否为媒体文件
public boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
ContentResolver resolver = getContentResolver();
switch (requestCode) {
case PHOTO_REQUEST:
Uri originalUri = intent.getData(); //1.获得图片的真实路径
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream(resolver.openInputStream(originalUri));//2.解码图片
} catch (FileNotFoundException e) {
Log.d(TAG, "onActivityResult: get file_exception");
e.printStackTrace();
}
if (bitmap != null) {
//3.根据Bitmap对象创建ImageSpan对象
Log.d(TAG, "onActivityResult: bitmap is not null");
ImageSpan imageSpan = new ImageSpan(NoteEditActivity.this, bitmap);
String path = getPath(this, originalUri);
//4.使用[local][/local]将path括起来,用于之后方便识别图片路径在note中的位置
String img_fragment = "[local]" + path + "[/local]";
//创建一个SpannableString对象,以便插入用ImageSpan对象封装的图像
SpannableString spannableString = new SpannableString(img_fragment);
spannableString.setSpan(imageSpan, 0, img_fragment.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
//5.将选择的图片追加到EditText中光标所在位置
NoteEditText e = (NoteEditText) findViewById(R.id.note_edit_view);
int index = e.getSelectionStart(); //获取光标所在位置
Log.d(TAG, "Index是: " + index);
Editable edit_text = e.getEditableText();
edit_text.insert(index, spannableString); //将图片插入到光标所在位置
mWorkingNote.mContent = e.getText().toString();
//6.把改动提交到数据库中,两个数据库表都要改的
ContentResolver contentResolver = getContentResolver();
ContentValues contentValues = new ContentValues();
final long id = mWorkingNote.getNoteId();
contentValues.put("snippet", mWorkingNote.mContent);
contentResolver.update(Uri.parse("content://micode_notes/note"), contentValues, "_id=?", new String[]{"" + id});
ContentValues contentValues1 = new ContentValues();
contentValues1.put("content", mWorkingNote.mContent);
contentResolver.update(Uri.parse("content://micode_notes/data"), contentValues1, "mime_type=? and note_id=?", new String[]{"vnd.android.cursor.item/text_note", "" + id});
} else {
Toast.makeText(NoteEditActivity.this, "获取图片失败", Toast.LENGTH_SHORT).show();
}
break;
default:
break;
}
}
//
注意:
4.加入方法convertToImage()(路径:MiNotes\app\src\main\java\net\micode\notes\ui\NoteEditActivity.java)
private void convertToImage() {
NoteEditText noteEditText = (NoteEditText) findViewById(R.id.note_edit_view); //获取当前的edit
Editable editable = noteEditText.getText();//1.获取text
String noteText = editable.toString(); //2.将note内容转换为字符串
int length = editable.length(); //内容的长度
//3.截取img片段 [local]+uri+[local],提取uri
for(int i = 0; i < length; i++) {
for(int j = i; j < length; j++) {
String img_fragment = noteText.substring(i, j+1); //img_fragment:关于图片路径的片段
if(img_fragment.length() > 15 && img_fragment.endsWith("[/local]") && img_fragment.startsWith("[local]")){
int limit = 7; //[local]为7个字符
//[local][/local]共15个字符,剩下的为真正的path长度
int len = img_fragment.length()-15;
//从[local]之后的len个字符就是path
String path = img_fragment.substring(limit,limit+len);//获取到了图片路径
Bitmap bitmap = null;
Log.d(TAG, "图片的路径是:"+path);
try {
bitmap = BitmapFactory.decodeFile(path);//将图片路径解码为图片格式
} catch (Exception e) {
e.printStackTrace();
}
if(bitmap!=null){ //若图片存在
Log.d(TAG, "图片不为null");
ImageSpan imageSpan = new ImageSpan(NoteEditActivity.this, bitmap);
//4.创建一个SpannableString对象,以便插入用ImageSpan对象封装的图像
String ss = "[local]" + path + "[/local]";
SpannableString spannableString = new SpannableString(ss);
//5.将指定的标记对象附加到文本的开始...结束范围
spannableString.setSpan(imageSpan, 0, ss.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
Log.d(TAG, "Create spannable string success!");
Editable edit_text = noteEditText.getEditableText();
edit_text.delete(i,i+len+15); //6.删掉图片路径的文字
edit_text.insert(i, spannableString); //7.在路径的起始位置插入图片
}
}
}
}
}
最后一步:这里有一个小细节,就是导入的图片会变成路径,我们需要调用convertToImage()函数,在,onCheckListModeChanged()和initNoteScreen()中加入convertToImage()的调用,如下图(可以双击Shift来找到相应的位置方便添加)
(路径:MiNotes\app\src\main\java\net\micode\notes\ui\NoteEditActivity.java)
1,在onCheckListModeChanged(),加入:
2.在initNoteScreen中加入调用
标签:便签,String,img,--,uri,软件工程,null,local,final From: https://blog.csdn.net/weixin_73164943/article/details/139282837