Android Java错误类型不匹配和未定义的方法?
下面是我的代码: 包com.loginformAndroid Java错误类型不匹配和未定义的方法?,java,android,Java,Android,下面是我的代码: 包com.loginform import java.util.ArrayList; import java.util.List; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.ResponseHandler; import org
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.R.string;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.os.Build;
public class MainActivity extends ActionBarActivity implements OnClickListener {
Button login;
EditText username, password;
TextView status;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setup();
}
private void setup() {
// TODO Auto-generated method stub
username = (EditText) findViewById(R.id.username);
password = (EditText) findViewById(R.id.password);
login = (Button) findViewById(R.id.login);
status = (TextView) findViewById(R.id.tvstatus);
login.setOnClickListener(this);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch(arg0.getId()){
case R.id.login:
login();
break;
}
}
private void login() {
// TODO Auto-generated method stub
try{
httpclient = new DefaultHttpClient();
httppost = new HttpPost ("http://10.0.2.2/android/check.php");
//add the data
nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("username", username.getText().toString().trim()));
nameValuePairs.add(new BasicNameValuePair("password", password.getText().toString().trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Execute Http Post Request
response = httpclient.execute(httppost);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
final String reponse = httpclient.execute(httppost, responseHandler);
tv.SetText(""+response);
if(response.equalsIgnoreCase("User Found")){
startActivity(new Intent(MainActivity.this.UserPage.class));
}
}catch(Exception e){
e.printStackTrace();
}
}
}
import java.util.ArrayList;
导入java.util.List;
导入org.apache.http.HttpResponse;
导入org.apache.http.NameValuePair;
导入org.apache.http.client.HttpClient;
导入org.apache.http.client.ResponseHandler;
导入org.apache.http.client.entity.UrlEncodedFormEntity;
导入org.apache.http.client.methods.HttpPost;
导入org.apache.http.impl.client.BasicResponseHandler;
导入org.apache.http.impl.client.DefaultHttpClient;
导入org.apache.http.message.BasicNameValuePair;
导入android.R.string;
导入android.support.v7.app.ActionBarActivity;
导入android.support.v7.app.ActionBar;
导入android.support.v4.app.Fragment;
导入android.content.Intent;
导入android.os.Bundle;
导入android.view.LayoutInflater;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.view.ViewGroup;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.TextView;
导入android.os.Build;
公共类MainActivity扩展ActionBarActivity实现OnClickListener{
按钮登录;
编辑文本用户名、密码;
文本视图状态;
HttpPost-HttpPost;
字符串缓冲区;
HttpResponse响应;
HttpClient-HttpClient;
列出nameValuePairs;
文本视图电视;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
设置();
}
私有无效设置(){
//TODO自动生成的方法存根
用户名=(EditText)findViewById(R.id.username);
密码=(EditText)findViewById(R.id.password);
login=(按钮)findviewbyd(R.id.login);
状态=(TextView)findViewById(R.id.tvstatus);
login.setOnClickListener(this);
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//处理操作栏项目单击此处。操作栏将
//自动处理Home/Up按钮上的点击,只要
//在AndroidManifest.xml中指定父活动时。
int id=item.getItemId();
if(id==R.id.action\u设置){
返回true;
}
返回super.onOptionsItemSelected(项目);
}
/**
*包含简单视图的占位符片段。
*/
公共静态类占位符片段扩展了片段{
公共占位符片段(){
}
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
视图根视图=充气机。充气(R.layout.fragment_main,容器,
假);
返回rootView;
}
}
@凌驾
公共void onClick(视图arg0){
//TODO自动生成的方法存根
开关(arg0.getId()){
案例R.id.login:
登录();
打破
}
}
私有void登录(){
//TODO自动生成的方法存根
试一试{
httpclient=新的DefaultHttpClient();
httppost=新的httppost(“http://10.0.2.2/android/check.php");
//添加数据
nameValuePairs=新的ArrayList(1);
添加(新的BasicNameValuePair(“用户名”,username.getText().toString().trim());
添加(新的BasicNameValuePair(“密码”,password.getText().toString().trim());
setEntity(新的UrlEncodedFormEntity(nameValuePairs));
//执行Http Post请求
response=httpclient.execute(httppost);
ResponseHandler ResponseHandler=新BasicResponseHandler();
最终字符串响应=httpclient.execute(httppost,responseHandler);
tv.SetText(“+响应);
if(response.equalsIgnoreCase(“用户找到”)){
startActivity(新意图(MainActivity.this.UserPage.class));
}
}捕获(例外e){
e、 printStackTrace();
}
}
}
我的错误如下:
/*error:Type mismatch: cannot convert from BasicResponseHandler to ResponseHandler<R.string>*/
ResponseHandler<String> responseHandler = new BasicResponseHandler();
/*error:tv cannot be resolved */
tv.SetText(""+response);
/*error:The method equalsIgnoreCase(String) is undefined for the type HttpResponse*/
if(response.equalsIgnoreCase("User Found"))
/*error:UserPage cannot be resolved or is not a field*/
startActivity(new Intent(MainActivity.this.UserPage.class));
/*错误:类型不匹配:无法从BasicResponseHandler转换为ResponseHandler*/
ResponseHandler ResponseHandler=新BasicResponseHandler();
/*错误:无法解析电视*/
tv.SetText(“+响应);
/*错误:HttpResponse类型的方法equalsIgnoreCase(String)未定义*/
if(response.equalsIgnoreCase(“用户找到”))
/*错误:无法解析UserPage或UserPage不是字段*/
startActivity(新意图(MainActivity.this.UserPage.class));
我已经尝试了所有的快速修复,但只要有更多的错误,任何帮助都将不胜感激!请不要我添加了文本视图电视;在其他定义的地方,仍然会出现错误。试试这种方法
BasicResponseHandler responseHandler = new BasicResponseHandler();
而不是
ResponseHandler<String> responseHandler = new BasicResponseHandler();
或
您定义Textview tv的地方??对不起,我有Textview tv;在where下我定义了ListView,但仍然得到错误:该代码行中的类型TextView的方法SetText(String)未定义。您应该使用tv.SetText(response.toString());
ResponseHandler<String> responseHandler = new BasicResponseHandler();
BasicResponseHandler responseHandler = new BasicResponseHandler();