昨天遇到的一个问题，就是我在主线程中生成了handler对象，但是在下边进行消息的发送的时候意外的报了异常，说是
- E/AndroidRuntime( 1819): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
- E/AndroidRuntime( 1819): at android.os.Handler.(Handler.java:121)
- E/AndroidRuntime( 1819): at android.widget.Toast.(Toast.java:68)
- E/AndroidRuntime( 1819): at android.widget.Toast.makeText(Toast.java:231)
意思就是说不能创建一个handler来代替线程中没有被调用Looper.prepare()，然后我在代码中添加了
Looper.prepare()，Looper.loop()这俩个方法。
package cn.wisenergy.tp;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import cn.wisenergy.tp.commonality.HttpClientHelper;
import cn.wisenergy.tp.fragment.MainFragment2;
import cn.wisenergy.tp.fragment_person.ChooseFriendActivity;
import cn.wisenergy.tp.url.Urlhelp;
public class LoginActivity extends Activity implements OnClickListener {
private TextView login_binding;
private TextView login_binding_zhuce;
private TextView login_userName;
private EditText login_password;
private Button btn_login;
private SharedPreferences spf;
private String name ;
private int userId;
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case 0:
Toast.makeText(LoginActivity.this, "登陆成功", Toast.LENGTH_SHORT).show();
Editor edit=spf.edit();
edit.putInt("userId", userId);
edit.putString("userName", name);
edit.putString("password", login_password.getText().toString());
edit.commit();
Intent intent = new Intent();
intent.setClass(LoginActivity.this, MainFragment2.class);
startActivity(intent);
finish();
break;
case 1:
Toast.makeText(LoginActivity.this, "登陆失败", Toast.LENGTH_SHORT)
.show();
break;
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
spf= getSharedPreferences("accountInfo", Context.MODE_PRIVATE);
name=spf.getString("userName", null);
setContentView(R.layout.login);
initViews();
}
public void initViews() {
login_userName =(TextView)findViewById(R.id.login_userName);
login_userName.setText(name);
login_password =(EditText)findViewById(R.id.login_password);
login_binding = (TextView) findViewById(R.id.login_binding);
btn_login = (Button) findViewById(R.id.btn_logins);
login_binding_zhuce = (TextView) findViewById(R.id.login_binding_zhuce);
login_binding.setOnClickListener(this);
btn_login.setOnClickListener(this);
login_binding_zhuce.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.login_binding:
// 切换到其它登陆方式
Intent intent = new Intent(LoginActivity.this, Login_bindingActivity.class);
startActivity(intent);
finish();
break;
case R.id.btn_logins:
// 登陆
submitLogin_info(name,login_password.getText().toString());
break;
case R.id.login_binding_zhuce:
//去注册
Intent intent2 = new Intent(LoginActivity.this, RegActivity.class);
startActivity(intent2);
finish();
break;
default:
break;
}
}
public int relateResult(String str) throws JSONException {
if (str != null && !str.equals("")) {
JSONObject json = new JSONObject(str);
if (json != null) {
if (!json.isNull("status")) {
JSONObject status = json.getJSONObject("status");//
if (!status.isNull("code")) {
int code = status.getInt("code");
return code;
} else {
Log.e("json", "没有code这个value");
}
}
}
} else {
Log.e("json", "json数据为空");
}
return 0;
}
public int relateResult1(String str) throws JSONException {
if (str != null && !str.equals("")) {
JSONObject json = new JSONObject(str);
if (json != null) {
if (!json.isNull("status")) {
int userId=json.getInt("data");
return userId;
}
}
} else {
Log.e("json", "json数据为空");
}
return 0;
}
public void submitLogin_info(final String name,
final String password) {
new Thread(new Runnable() {
@Override
public void run() {
Looper.prepare();
String result = HttpClientHelper.loadTextFromURL(Urlhelp.LOGIN+"loginName="+name+"&password="+password,name+":"+password,
LoginActivity.this);
Log.d("result", result);
if (result != null) {
int code;
try {
code = relateResult(result);
Log.d("CODE", code+"");
if (code == 2000) {
userId = relateResult1(result);
handler.sendEmptyMessage(0);
} else if (code == 4000) {
Toast.makeText(LoginActivity.this,
"指定用户不存在", Toast.LENGTH_SHORT).show();
} else if (code == 4001) {
Toast.makeText(LoginActivity.this,
"用户密码错误", Toast.LENGTH_SHORT).show();
} else if (code == 4002) {
Log.d("CODE", code+"");
Toast.makeText(LoginActivity.this,
"当前用户已被锁定不可登录（超出最大登录次数）",
Toast.LENGTH_SHORT).show();
} else if (code == 4003) {
Toast.makeText(LoginActivity.this,
"用户没有权限访问该资源", Toast.LENGTH_SHORT).show();
} else if (code == 4004) {
Toast.makeText(LoginActivity.this,
"用户认证信息已过期，需要更新", Toast.LENGTH_SHORT)
.show();
} else if (code == 4005) {
Toast.makeText(LoginActivity.this,
"用户未重新设置初试密码", Toast.LENGTH_SHORT).show();
} else if (code == 4006) {
Toast.makeText(LoginActivity.this,
"当前用户已被禁用（违规操作，管理员手动禁用）",
Toast.LENGTH_SHORT).show();
} else if (code == 4007) {
Toast.makeText(LoginActivity.this,
"接口参数非法：参数长度超出允许的最大值", Toast.LENGTH_SHORT)
.show();
} else if (code == 5009) {
Toast.makeText(LoginActivity.this,
"接口参数非法：参数长度超出允许的最小值", Toast.LENGTH_SHORT)
.show();
}
} catch (JSONException e) {
e.printStackTrace();
}
Looper.loop();
}
}
}).start();
}
}