我们在上一节https://www.imooc.com/article/267427点击一个item,就可以去编辑书本的名字
这个页面可以进行编辑，新增和删除的功能
public class BookDetail extends Activity {
public static final String TAG = TestHttpActivity.class.getSimpleName();
private TextView mBookName;
private EditText mBookNameEdit;
private boolean isAddOrEdit;
private LinearLayout description_layout;
private EditText mDescriptionEdit;
private Book mBook;
private TitleBarCommon mTitleBarCommon;
public static void startActivity(Context context, Book book) {
Intent intent = new Intent();
intent.putExtra("book",book);
intent.setClass(context,BookDetail.class);
context.startActivity(intent);
}
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.book_detail);
initTitle();
Intent intent = getIntent();
mBook = (Book)intent.getSerializableExtra("book");
mBookName = (TextView)findViewById(R.id.bookName);
mBookNameEdit = (EditText)findViewById(R.id.bookname_edit);
mDescriptionEdit = (EditText) findViewById(R.id.bookdescription_edit);
TextView mSaveBtn = (TextView)findViewById(R.id.save_tv);
mSaveBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new InitDataAsyncTask(mBook).execute();
}
});
description_layout = (LinearLayout)findViewById(R.id.description_layout);
if(mBook == null) {
description_layout.setVisibility(View.VISIBLE);
isAddOrEdit = true;
mTitleBarCommon.setRightTextViewString("");
}else{
mBookNameEdit.setText(mBook.bookName);
isAddOrEdit = false;
}
}
private class InitDataAsyncTask extends AsyncTask<Void,Void,Void> {
private Book mBook;
public InitDataAsyncTask(Book book) {
mBook = book;
}
@Override
protected Void doInBackground(Void... params) {
if(!isAddOrEdit) {
String para = new String("bookid="+mBook.bookid+"&bookName="+mBookNameEdit.getText().toString());
String url = "http://139.199.89.89/api/v1/books";
HttpUtil httpUtil = new HttpUtil();
String response = httpUtil.post(BookDetail.this,url,para);
Log.d(TAG,"<<<<<response="+response);
}else{
String para = new String("bookDescription="+mBookNameEdit.getText().toString()+"&bookName="+mBookNameEdit.getText().toString());
String url = "http://139.199.89.89/api/v1/books";
HttpUtil httpUtil = new HttpUtil();
String response = httpUtil.post(BookDetail.this,url,para);
Log.d(TAG,"<<<<<response="+response);
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
finish();
}
}
private void initTitle() {
mTitleBarCommon = (TitleBarCommon)findViewById(R.id.head_common_layout);
mTitleBarCommon.setRightTextViewString("删除");
mTitleBarCommon.setRightTextViewListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!isAddOrEdit) {
new DeleteAsyncTask().execute();
}
}
});
mTitleBarCommon.setLeftViewListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
private class DeleteAsyncTask extends AsyncTask<Void,Void,Void> {
@Override
protected Void doInBackground(Void... params) {
String para = new String("bookid="+mBook.bookid);
String url = "http://139.199.89.89/api/v1/books";
HttpUtil httpUtil = new HttpUtil();
httpUtil.doDelete(url,para);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
finish();
}
}
}Http的操作是:
public void doDelete(String urlStr,String params){
try{
System.out.println(urlStr);
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("DELETE");
DataOutputStream ds = new DataOutputStream(conn.getOutputStream());
conn.getOutputStream().write(params.getBytes());
ds.flush();
conn.getInputStream();
if(conn.getResponseCode() ==200){
System.out.println(">>>>>>成功");
}else{
System.out.println(conn.getResponseCode());
}
}catch (Exception ex) {
ex.printStackTrace();
}
}
public String post(Context context, final String strUrl, String params) {
URL postUrl = null;
try {
postUrl = new URL(strUrl);
} catch (MalformedURLException ex) {
Log.e("HttpUtil", "get MalformedURL", ex);
return null;
}
InputStream input = null;
DataOutputStream ds = null;
ByteArrayOutputStream byteOutStream = null;
HttpURLConnection conn = null;
byte[] outData = null;
try {
conn = getConnection(context, postUrl);
connection = conn;
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setConnectTimeout(TIMEOUT * 2);
conn.setReadTimeout(TIMEOUT * 2);
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length",String.valueOf(params.getBytes().length));
//byte[] data = new byte[BUF_LEN];
ds = new DataOutputStream(conn.getOutputStream());
conn.getOutputStream().write(params.getBytes());
ds.flush();
input = conn.getInputStream();
byteOutStream = new ByteArrayOutputStream();
outData = getResponse(input, byteOutStream, tmpBuf);
if(mHandler != null){
Message msg = new Message();
msg.what = POST_PROGRESS_NOTIFY;
msg.arg1 = 90;
mHandler.sendMessage(msg);
}
String webcontent = null;
if(outData != null && outData.length > 0){
webcontent = new String(outData);
}
return webcontent;
} catch (Exception ex) {
Log.e("HttpUtil", "post", ex);
} catch (OutOfMemoryError ex){
Log.e("HttpUtil", "post OutOfMemoryError", ex);
} finally {
try {
outData = null;
if (input != null){
input.close();
input = null;
}
if (ds != null){
ds.close();
ds = null;
}
if (conn != null){
conn.disconnect();
conn = null;
}
if (byteOutStream != null){
byteOutStream.close();
byteOutStream = null;
}
if(mHandler != null){
Message msg = new Message();
msg.what = POST_PROGRESS_NOTIFY;
msg.arg1 = 100;
mHandler.sendMessage(msg);
}
} catch (Exception ex) {
Log.e("HttpUtil", "post finally", ex);
}
}
return null;
}
private byte[] getResponse(InputStream input, ByteArrayOutputStream byteOutStream, byte[] data) throws IOException {
if(input == null || byteOutStream == null || data == null){
return null;
}
int i = 0;
while((i = input.read(data)) != -1){
byteOutStream.write(data, 0, i);
}
byte[] bmpData = byteOutStream.toByteArray();
return bmpData;
}
private HttpURLConnection getConnection(Context context, URL url) throws Exception{
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
return conn;
}
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