Question

当我通过onclick线程和可运行代码调用dbconctfun(view v)方法时，它在dbconctfun(view v)方法中执行其他代码后最后执行。在控制台中显示：

out of loop   out of loop
test#######   multiple class.forname
queryexct     queryexct

我的代码：

package com.example.loginandroid;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;

import java.sql.SQLException;
import java.sql.Statement;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import android.os.Looper;

public class MainActivity extends Activity{
    String username,password;     ResultSet rs =null;
    boolean temcfag=false,temqfag=true;
    public static String tag="Lifecycle activity";
    EditText user,pass;
    AlertDialog.Builder dialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        dialog=new AlertDialog.Builder(this);
        dialog.setNeutralButton("OK", null);


        user=(EditText)findViewById(R.id.editText1);
        pass=(EditText)findViewById(R.id.editText2);
    }

    Thread  thrd1,thrd2,thrd3;
    Connection con;
    String result ="",queryexct;

    public void dbconctfun(View v )  throws SQLException {

        try {
            Class.forName("com.mysql.jdbc.Driver");
             Log.v("test#######","multiple class.forname");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        thrd1 = new Thread(new Runnable() {
            public void run() {
                while (!Thread.interrupted()) {
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e1) {
                    }
                    if (con == null) {
                        try {
                            con = DriverManager.getConnection("jdbc:mysql://111.111.11.11:6666/dyne", "root1", "mysql");
                        } catch (SQLException e) {
                            e.printStackTrace();
                            con = null;
                        }

                        if ((thrd2 != null) && (!thrd2.isAlive()))
                            thrd2.start();

                    }
                }

            }
        });
        if ((thrd1 != null) && (!thrd1.isAlive())) thrd1.start();

        thrd2 = new Thread(new Runnable() {
            public void run() {
                while (!Thread.interrupted()) {

                    if (con != null) {
                        if (temqfag) {
                        try {
                            Statement st = con.createStatement();
                            username=user.getText().toString().trim();
                            password=pass.getText().toString().trim();
                            queryexct="SELECT * FROM  `user_registration` WHERE  `email_id` =  '"+username+"' AND  `password` =  '"+password+"'";
                            rs = st.executeQuery(queryexct);
                            Log.v("queryexct","queryexct");
                            temqfag=false;
                        } catch (SQLException e) {
                            e.printStackTrace();
                            con = null;
                        }

                        try {
                            Log.v("test#######","errorrrrrrrrrrr3");
                            if (temqfag) {Thread.sleep(10);}
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }}
                    } else {
                        try {
                            Log.v("test#######","errorrrrrrrrrrr4");
                            Thread.sleep(300);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }

        });
        Log.v("out of loop","out of loop");
        if(rs!=null){
            if (rs.next()) {
                Log.v("test#######","errorrrrrrrrrrr1");
                Looper.prepare();
                Thread.interrupted();
                setContentView(R.layout.activity_main1);
                Log.v("test#######","errorrrrrrrrrrr1");
            }
            else{
                Log.v("test#######","errorrrrrrrrrrr2");
                Thread.interrupted();
                Looper.prepare();

                dialog.setMessage("Your username and password are not valid");
                dialog.show();


            }
        }
        temqfag=true;
    }
}

Answer 1

setContentView是您活动的一个功能。

所以你需要从其他函数调用它：

 MainActivity.this.setContentView(R.layout.activity_main1);

Answer 2

我没有完全得到你想要的但是从我的理解如果你试图使用线程改变布局然后你将无法做到这一点，因为它只能在主线程上。

从另一个函数调用setContentView（R.layout）函数？

2 个答案: