输入输出
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package com.example.lenovo.lianxiyong;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.io.FileInputStream;
public class DengluActivity extends AppCompatActivity {
EditText et_2;
EditText et_3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_denglu);
et_2 = (EditText) findViewById(R.id.et_2);
et_3 = (EditText) findViewById(R.id.et_3);
}
public void bt2_OnClick(View v) {
Intent intent = new Intent(this, ZhuceActivity.class);
startActivity(intent);
}
public void bt1_OnClick(View v) {
String name = "";
String code = "";
String pword = "";
try {
FileInputStream fis1 = openFileInput("name.txt");
byte[] b1 = new byte[1024];
int i1 = 0;
while ((i1 = fis1.read(b1)) > 0) {
String name1 = new String(b1, 0, i1);
name += name1;
}
fis1.close();
FileInputStream fis2 = openFileInput("code.txt");
byte[] b2 = new byte[1024];
int i2 = 0;
while ((i2 = fis2.read(b2)) > 0) {
String code1 = new String(b2, 0, i2);
code += code1;
}
fis2.close();
FileInputStream fis3 = openFileInput("password.txt");
byte[] b3 = new byte[1024];
int i3 = 0;
while ((i3 = fis3.read(b3)) > 0) {
String pword1 = new String(b3, 0, i3);
pword += pword1;
}
fis3.close();
} catch (Exception e) {
}
String et_code = et_2.getText().toString();
String et_pass = et_3.getText().toString();
if (et_code.trim().length() == 0 || et_pass.trim().length() == 0) {
Toast.makeText(DengluActivity.this, "用户名或密码不能为空", Toast.LENGTH_SHORT).show();
return;
}
if (et_code == null || et_code.equals(code)) {
Toast.makeText(DengluActivity.this, "用户未注册", Toast.LENGTH_SHORT).show();
return;
}
if (et_pass == null || et_pass.equals(pword)) {
Toast.makeText(DengluActivity.this, "密码错误", Toast.LENGTH_SHORT).show();
return;
} else {
Toast.makeText(DengluActivity.this, "登录成功", Toast.LENGTH_LONG).show();
Intent intent = new Intent(this,JizhuzhanghaoActivity.class);
startActivity(intent);
finish();
}
}
}
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<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.lenovo.lianxiyong.ZhuceActivity"> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="用户名称" android:id="@+id/et_2"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="密码" android:inputType="numberPassword" android:layout_below="@id/et_2" android:id="@+id/et_3"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/et_3"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:text="登陆" android:id="@+id/bt_1" android:onClick="bt1_OnClick" android:layout_weight="1"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:text="注册" android:id="@+id/bt_2" android:onClick="bt2_OnClick" android:layout_weight="1"/> </LinearLayout> </RelativeLayout>
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package com.example.lenovo.lianxiyong;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.FileOutputStream;
import java.io.PrintStream;
public class ZhuceActivity extends AppCompatActivity {
EditText et_1;
EditText et_2;
EditText et_3;
Button bt_1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_zhuce);
et_1 = (EditText) findViewById(R.id.et_1);
et_2 = (EditText) findViewById(R.id.et_2);
et_3 = (EditText) findViewById(R.id.et_3);
bt_1 = (Button) findViewById(R.id.bt_1);
bt_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setResult(RESULT_CANCELED, null);
finish();
}
});
}
public void bt1_OnClick(View v) {
String user_name = et_1.getText().toString();
if (user_name == null || user_name.trim().length() == 0) {
Toast.makeText(this, "请正确输入用户名", Toast.LENGTH_SHORT).show();
return;
}
String user_code = et_2.getText().toString();
if (user_code == null || user_code.trim().length() == 0) {
Toast.makeText(this, "请正确输入用户代码", Toast.LENGTH_SHORT).show();
return;
}
String pass_word = et_3.getText().toString();
if (pass_word == null || pass_word.trim().length() == 0) {
Toast.makeText(this, "请正确填写用户密码", Toast.LENGTH_SHORT).show();
return;
}
try {
FileOutputStream fos1 = openFileOutput("name.txt", MODE_PRIVATE);
PrintStream ps1 = new PrintStream(fos1);
ps1.println(user_name);
FileOutputStream fos2 = openFileOutput("code.txt", MODE_PRIVATE);
PrintStream ps2 = new PrintStream(fos2);
ps2.println(user_code);
FileOutputStream fos3 = openFileOutput("password.txt", MODE_PRIVATE);
PrintStream ps3 = new PrintStream(fos1);
ps3.println(pass_word);
ps1.close();
ps2.close();
ps3.close();
fos3.close();
Toast.makeText(ZhuceActivity.this, "注册并保存成功", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(ZhuceActivity.this, "注册并保存失败", Toast.LENGTH_SHORT).show();
}
Intent intent = new Intent(this,DengluActivity.class);
startActivity(intent);
finish();
}
}
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical" tools:context="com.example.lenovo.lianxiyong.ZhuceActivity"> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="用户名称" android:id="@+id/et_1"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="用户代码" android:id="@+id/et_2"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="密码" android:id="@+id/et_3"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:layout_width="0dp" android:layout_height="wrap_content" android:text="取消" android:id="@+id/bt_1" android:layout_weight="1"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:text="确定" android:id="@+id/bt_2" android:layout_weight="1" android:onClick="bt1_OnClick"/> </LinearLayout> </LinearLayout>
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package com.example.lenovo.lianxiyong;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.io.FileInputStream;
public class JizhuzhanghaoActivity extends AppCompatActivity {
TextView tv_1;
TextView tv_2;
String name = "";
String code = "";
String pword = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jizhuzhanghu);
tv_1 = (TextView) findViewById(R.id.tv_1);
tv_2 = (TextView) findViewById(R.id.tv_2);
tv_3 = (TextView) findViewById(R.id.tv_3);
try {
FileInputStream fis1 = openFileInput("name.txt");
byte[] b1 = new byte[1024];
int i1 = 0;
while ((i1 = fis1.read(b1)) > 0) {
String name1 = new String(b1, 0, i1);
name += name1;
}
tv_1.setText("用户名称:" + name);
fis1.close();
FileInputStream fis2 = openFileInput("code.txt");
byte[] b2 = new byte[1024];
int i2 = 0;
while ((i2 = fis2.read(b2)) > 0) {
String code1 = new String(b2, 0, i2);
code += code1;
}
tv_2.setText("用户代码:" + code);
fis2.close();
FileInputStream fis3 = openFileInput("password.txt");
byte[] b3 = new byte[1024];
int i3 = 0;
while ((i3 = fis3.read(b3)) > 0) {
String pword1 = new String(b3, 0, i3);
pword += pword1;
}
} catch (Exception e) {
}
}
}
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical" tools:context="com.example.lenovo.lianxiyong.ZhuceActivity"> <TextView android:layout_width="match_parent" android:layout_height="60dp" android:id="@+id/tv_1"/> <TextView android:layout_width="match_parent" android:layout_height="60dp" android:id="@+id/tv_2"/> <TextView android:layout_width="match_parent" android:layout_height="60dp" android:id="@+id/tv_3"/> </LinearLayout>