问题描述
- 请教一个Activity跳转到另外一个Activity失败的问题
-
package com.example.t;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;public class LoginActivity extends Activity {
private EditText mAccount; private EditText mPwd; private Button mLoginButton; private View loginView; private View loginSuccessView; private TextView loginSuccessShow; private LoginDataManager mUserDataManager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.loginpage); mAccount=(EditText) findViewById(R.id.login_edit_account); mPwd = (EditText) findViewById(R.id.login_edit_pwd); mLoginButton = (Button) findViewById(R.id.login_btn_login); loginView=findViewById(R.id.login_view); loginSuccessView=findViewById(R.id.login_success_view); loginSuccessShow=(TextView) findViewById(R.id.login_success_show); mLoginButton.setOnClickListener(mListener); if (mUserDataManager == null) { mUserDataManager = new LoginDataManager(this); mUserDataManager.openDataBase(); } } OnClickListener mListener = new OnClickListener() { public void onClick(View v) { int id=v.getId(); if( id==R.id.login_btn_login){ login(); } } }; public void login() { if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); String userPwd = mPwd.getText().toString().trim(); int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd); if(result==1){ //login success loginView.setVisibility(View.GONE); loginSuccessView.setVisibility(View.VISIBLE); loginSuccessShow.setText(getString(R.string.user_login_sucess, userName)); Toast.makeText(this, getString(R.string.login_sucess), Toast.LENGTH_SHORT).show(); }else if(result==0){ //login failed,user does't exist Toast.makeText(this, getString(R.string.login_fail), Toast.LENGTH_SHORT).show(); } } } public void register() { if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); String userPwd = mPwd.getText().toString().trim(); //check if user name is already exist int count=mUserDataManager.findUserByName(userName); if(count>0){ Toast.makeText(this, getString(R.string.name_already_exist, userName), Toast.LENGTH_SHORT).show(); return ; } } } public boolean isUserNameAndPwdValid() { if (mAccount.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.account_empty), Toast.LENGTH_SHORT).show(); return false; } else if (mPwd.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.pwd_empty), Toast.LENGTH_SHORT).show(); return false; } return true; } @Override protected void onResume() { if (mUserDataManager == null) { mUserDataManager = new LoginDataManager(this); mUserDataManager.openDataBase(); } super.onResume(); } @Override protected void onDestroy() { super.onDestroy(); } @Override protected void onPause() { if (mUserDataManager != null) { mUserDataManager.closeDataBase(); mUserDataManager = null; } super.onPause(); } }另一个
package com.example.t;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.AdapterView.OnItemClickListener;/**
- @author Administrator
- @description 首页
*/
public class HomePageActivity extends Activity implements OnItemClickListener {private boolean[] isPermitted;
int drawableitems[] = { R.drawable.aa,R.drawable.bb,R.drawable.cc,R.drawable.dd,R.drawable.ee,R.drawable.ff,R.drawable.gg};String[] itemsnames = { "最热单品","时尚饰品","珠宝首饰", "品质手表","潮流眼镜","绅士配件","DIY" };
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
GridView gridview = (GridView) findViewById(R.id.GridView);
List> itemList = new ArrayList>();for (int i = 0; i < itemsnames.length; i++) { Map<String, Object> map = new HashMap<String, Object>(); map.put("ItemImage", drawableitems[i]); map.put("ItemText", itemsnames[i]); itemList.add(map); } SimpleAdapter saMenuItem = new SimpleAdapter(this, itemList, // 数据源 R.layout.homeitems, // xml实现 new String[] { "ItemImage", "ItemText" }, // 对应map的Key new int[] { R.id.ItemImage, R.id.ItemText }); // 对应R的Id // 添加Item到网格中 gridview.setAdapter(saMenuItem); gridview.setOnItemClickListener(this); //permit setting isPermitted = new boolean[saMenuItem.getCount()];}
@Override
public void onItemClick(AdapterView<?> adapter, View view, int position,
long id) {System.out.println("id:" + id); System.out.println("position:" + position);
// String[] itemsnames = { "最热单品","时尚饰品","珠宝首饰", "品质手表","潮流眼镜","绅士配件","DIY" };
if (position == 0) {
System.out.println("最热单品");
Intent intent1 = new Intent(this, HotActivity.class);
startActivity(intent1);
}
if (position == 1) {
System.out.println("时尚饰品");
Intent intent = new Intent(this, FashionActivity.class);
startActivity(intent);
}
if (position == 2) {
System.out.println("珠宝首饰");
Intent intent = new Intent(this, JewelryActivity.class);
startActivity(intent);
}
if (position == 3) {
System.out.println("品质手表");
Intent intent = new Intent(this, WatchActivity.class);
startActivity(intent);
}
if (position == 4) {
System.out.println("潮流眼镜");
Intent intent = new Intent(this, GlassesActivity.class);
startActivity(intent);
}
if (position == 5) {
System.out.println("绅士配件");
Intent intent = new Intent(this,GentryActivity.class);
startActivity(intent);
}
if (position == 6) {
System.out.println("DIY");
Intent intent = new Intent(HomePageActivity.this,DiyActicity.class);
startActivity(intent);
}}}
之前可能发错了，不好意思
是不是缺少了一些代码，求补充~
解决方案
//判断用户名和密码是否正确，如果正确了跳转到其他页面
if(username.equals("admin")&&password.equals("123456")){
Intent intent = new Intent();
//AaActivity.this代表本类 HomePageActivity.class代表要跳转的类
intent.setClass(AaActivity.this, HomePageActivity.class);
//页面跳转
startActivity(intent);
Toast.makeText(AaActivity.this, "登录成功", 0).show();
}else{
Toast.makeText(AaActivity.this, "用户名或密码错误", 0).show();
}
解决方案二：
没有看到activity
解决方案三：
我没看到你跳转的代码啊？而且你这个粘出来的也不是你activity，这怎么看？
解决方案四：
第一个Activitypublic class activity02 extends Activity {
/** Called when the activity is first created. */
private Button myButton = null; //申明为成员变量
@Override
public void onCreate(Bundle......
答案就在这里：从一个Activity跳转到另一个Activity
解决方案五：
不知楼主什么意思，这里面一个intent,一个Activity都没有，怎么可能会跳转呢？你代码贴错了
解决方案六：
问问题一定要尽量说明清楚，你activity的代码都没有贴，然而把数据库的代码贴一大堆，丢一句点击登录闪退，不逗啊
解决方案七：
你这没有intent和Activity，如何跳？？
解决方案八：
这种情况可能是没有在配置文件中注册activity
解决方案九：
public long insertUserData(LoginData userData) {
String userName=userData.getUserName();
String userPwd=userData.getUserPwd();
ContentValues values = new ContentValues();
values.put(USER_NAME, userName);
values.put(USER_PWD, userPwd);
return mSQLiteDatabase.insert(TABLE_NAME, ID, values);
}
最后一句为啥传入ID进去吗，不是要传个null?
解决方案十：
activity没找到，我还以为我看错了呢，