如何在Android中保存TextView / Array并在以后检索？

我真的很陌生，并且在申请方面也取得了稳步的进展。我想创建一个允许用户使用滑块设置长度并生成密码的应用程序。完成此操作后，我希望用户能够保存其生成的密码。到目前为止，除了保存密码以在应用程序关闭后恢复密码之外，我已经实现了所有其他目的。我已经阅读了很多文章，但我只是不明白如何在应用程序关闭后保存应用程序数据，将其保存到文件或SharedPrefrences中。一些澄清和帮助将不胜感激。

我想实现的目标

我希望用户单击一个按钮，然后将他们生成的密码（存储在该数组中）保存在应用程序中，然后在关闭它并稍后返回时可以检索这些保存的密码。

感谢所有高级的人，对这个代码可能很混乱我深表歉意，但是我正在学习：D

谢谢

-杰克

MainActivity屏幕截图

主要活动XML：

    <?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:id="@+id/activity_main"
    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.jrfapplications.passgen.MainActivity">

    <SeekBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/passdesc"
        android:layout_marginTop="27dp"
        android:id="@+id/seekBar"
        android:max="20"
        android:progress="10"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <Button
        android:text="@string/passbutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:textSize="12sp"
        android:onClick="genpass"
        android:layout_marginTop="40dp"
        android:layout_below="@+id/seekBar"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/seekBar"
        android:layout_centerHorizontal="true"
        android:text="@string/SeekValueView"
        android:id="@+id/SeekTextView" />

    <TextView
        android:text="@string/pass_desc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="@dimen/pass_desc_size"
        android:id="@+id/passdesc"
        android:textAlignment="center"
        android:layout_marginTop="122dp"
        android:layout_below="@+id/password"
        android:layout_centerHorizontal="true" />

    <TextView
        android:text="@string/password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/password"
        android:textSize="@dimen/password"
        android:layout_marginTop="86dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <Button
        android:text="@string/NextPageText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button"
        android:id="@+id/button2"
        android:layout_alignLeft="@+id/button"
        android:layout_alignStart="@+id/button"
        android:layout_alignRight="@+id/button"
        android:layout_alignEnd="@+id/button"
        android:onClick="goToSavedPassActivity"
        android:textSize="12sp" />

</RelativeLayout>

主要活动Java：

    public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final TextView mPassword;
    Button mGenPassButton;      //Defining Variables
    final TextView mSeekBarValue;
    Button mSavedPassActivity;

    mPassword = (TextView) findViewById(R.id.password);
    mGenPassButton = (Button) findViewById(R.id.button);        //Settings values and locations
    mSeekBarValue = (TextView) findViewById(R.id.SeekTextView);
    SeekBar seek=(SeekBar) findViewById(R.id.seekBar);
    mSavedPassActivity = (Button) findViewById(R.id.button2);

    seek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { //Seekbar Actions

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) { //When user moves it
            // TODO Auto-generated method stub
            SeekBarValue.seekval = progress;
            mSeekBarValue.setText(String.valueOf(progress));

        }
    });

    mSavedPassActivity.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(MainActivity.this, SavedPassActivity.class));
        }
    });

    mGenPassButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            char[] chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".toCharArray();
            final StringBuilder sb = new StringBuilder();
            Random random = new Random();
            for (int i = 0; i < SeekBarValue.seekval; i++) {
                char c = chars[random.nextInt(chars.length)];
                sb.append(c);
            }

            final String output = sb.toString();
            mPassword.setText(output);
            SavedPassArray.SavedPasswords.add(output);
        }
    });

    }
}

SeekBarValue Java：

    public class SeekBarValue {
public static int seekval;
}

Java SavedPassedArray：

    public class SeekBarValue {
public static int seekval;
}

ViewPasswordActivity屏幕截图

密码查看活动XML：

    <?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:id="@+id/activity_saved_pass"
    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.jrfapplications.passgen.SavedPassActivity">

    <TextView
        android:text="@string/PassList"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/PasswordsList"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:textSize="18sp"
        android:scrollbars="vertical"
        android:textStyle="normal|bold" />
</RelativeLayout>

密码查看Java：

public class SavedPassActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_saved_pass);

    final TextView mPasswordsLists;

    mPasswordsLists = (TextView) findViewById(R.id.PasswordsList);

    StringBuilder allpasswords = new StringBuilder();

    for (String s : SavedPasswords ){
        if(allpasswords.length() > 0){
            allpasswords.append("\n");
        }
        allpasswords.append(s);        }

    mPasswordsLists.setText(allpasswords.toString());
    mPasswordsLists.setMovementMethod(new ScrollingMovementMethod());

    //for(int i=0; i < SavedPasswords.size(); i++){
    }
}