xiaomibianqian/note-master-function/main/java/net/micode/notes/ui/LoginActivity.java

package net.micode.notes.ui;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import net.micode.notes.R;
public class LoginActivity extends Activity {
    EditText lg_password;
    Button lg_login;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SharedPreferences pref=getSharedPreferences("user management",MODE_PRIVATE);
        boolean User_boolean = pref.getBoolean("user",false);//获取用户是否设置了
        if(!User_boolean) //User_boolean = false 时，（没有设置密码），直接跳转到便  签主界面

        {
            Intent intent=new Intent(LoginActivity.this,NotesListActivity.class);
            startActivity(intent);
            finish();
        }
        setContentView(R.layout.activity_login);
        getWindow().setSoftInputMode(
                WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE
                        | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        lg_password=(EditText) findViewById(R.id.lg_password);
        lg_login=(Button)findViewById(R.id.login);
        lg_login.setOnClickListener(new View.OnClickListener() {
                                        @Override
                                        public void onClick(View v) {
                                            SharedPreferences
                                                    pref=getSharedPreferences("user management",MODE_PRIVATE);
                                            String
                                                    password=pref.getString("password","");
                                            if(password.equals("")==false&&password.equals(lg_password.getText().toString())
                                                    ==true){
                                                Intent intent=new
                                                        Intent(LoginActivity.this,NotesListActivity.class);
                                                startActivity(intent);
                                                finish();
                                            }
                                            else{
                                                Toast.makeText(LoginActivity.this, " 密码错误", Toast.LENGTH_SHORT).show();
                                                lg_password.setText("");//把密码框内输入过的错误密码清空

                                            }
                                        }
                                    }
        );
    }
}