我對此很感興趣,並在製作應用程序方面取得穩步進展。我想創建一個應用程序,允許用戶使用滑塊生成隨機密碼來設置長度,然後生成它。一旦完成,我希望用戶能夠保存他們生成的密碼。到目前爲止,我已經實現了一切,除了保存密碼以便在應用程序關閉後進行恢復。我已經閱讀了很多文章,並且我只是不知道如何在應用程序關閉後保存應用程序數據,天氣是文件還是SharedPrefrences。一些澄清和幫助將非常感激。如何在Android中保存TextView/Array並稍後檢索?
我想實現
我想,當他們關閉它的用戶點擊,他們已經生成的密碼(存儲在該數組中)被保存在應用程序,然後一個按鈕,來什麼回來後,他們可以檢索這些保存的密碼。
感謝大家在先進的,我做我的乞求原諒有關的代碼它可能非常混亂,但我學習:d
感謝
-Jack
主要活動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>
主要活動的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的Java:
public class SeekBarValue {
public static int seekval;
}
SavedPassedArray的Java:
public class SeekBarValue {
public static int seekval;
}
ViewPasswordActivity ScreenShot
密碼查看活動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>
密碼查看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++){
}
}
你想要一個數據庫。 SharedPreferences中的列表不能很好地工作。 https://developer.android.com/training/basics/data-storage/databases.html –