网上搜了一些app添加密码锁的方法，但是都太麻烦了。。。想来想去其实加密码的目的就是不让别人看到主界面的内容，那弄个界面遮起来不就行了，，所以打算弄一个对话框一直显示在主界面挡住内容，直到输对密码才消失（其实就是懒得折腾常规方法）
添加xml界面
大概需要二个界面，点击添加密码有一个对话框，选择添加数字密码，然后有一个输入密码的界面，遮挡内容的界面也用这个（懒）
password_add.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:id="@+id/password_num_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/button_round"
android:foreground="?android:attr/selectableItemBackground"
android:text="数字密码" />
</LinearLayout>password_num_dialog.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<EditText
android:layout_margin="50dp"
android:id="@+id/password_num_edit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="numberPassword"
android:maxLength="4"
/>
<Button
android:text="确定"
android:background="@drawable/confirm_btn_round"
android:id="@+id/password_num_confirm"
android:layout_marginTop="20dp"
android:layout_marginBottom="50dp"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>对话框
选择密码类型对话框
private void Add_Password(){
final AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
builder.setTitle("添加密码");
View view=LayoutInflater.from(getContext()).inflate(R.layout.password_add,null);
builder.setView(view);
Button password_num_btn=view.findViewById(R.id.password_num_btn);
password_num_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Add_Num_Dialog();
}
});
builder.show();
}添加数字密码对话框
//储存数字密码
List<String> Number_passwords=new ArrayList<>();
//
private void Add_Num_Dialog(){
final AlertDialog.Builder builder=new AlertDialog.Builder(getContext());
builder.setTitle("输入4位数字密码");
final View view=LayoutInflater.from(getContext()).inflate(R.layout.password_num_dialog,null);
builder.setView(view);
final EditText num_edit=view.findViewById(R.id.password_num_edit);
Button confirm_btn=view.findViewById(R.id.password_num_confirm);
final AlertDialog dialog=builder.show();
confirm_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Get_Password(Number_passwords,"num_password");
if (num_edit.getText().toString().length()==4){
if (Number_passwords.contains(num_edit.getText().toString())){
Toast.makeText(getActivity(), "您已经添加过该密码！", Toast.LENGTH_SHORT).show();
}else {
Number_passwords.add(num_edit.getText().toString());
Save_Password(Number_passwords,"num_password");
Toast.makeText(getActivity(), "已添加密码！", Toast.LENGTH_SHORT).show();
dialog.dismiss();
}
}
else {
Toast.makeText(getActivity(), "请输入4位数密码！", Toast.LENGTH_SHORT).show();
}
}
});
}
//
//
private void Save_Password(List<String> arrayList, String s){
SharedPreferences sp=getContext().getSharedPreferences(s,Context.MODE_PRIVATE);
SharedPreferences.Editor edit = sp.edit();
edit.putInt("size", arrayList.size());
for (int i = 0; i < arrayList.size(); i++) {
edit.remove(s+i);
edit.putString(s + i, arrayList.get(i));
}
edit.apply();
}
private void Get_Password(List<String> arrayList,String s){
SharedPreferences sp=getContext().getSharedPreferences(s,Context.MODE_PRIVATE);
int size=sp.getInt("size",0);
for(int i=0;i<size;i++) {
arrayList.add (sp.getString(s+i,null));
}
}传值
fragment与activity传值
在fragment中定义接口
private MyListener myListener;
public interface MyListener{
public void change_mode(Boolean mode);
}
//
//
//回调
@Override
public void onAttach(Context context) {
super.onAttach(context);
myListener=(MyListener)getContext();
}
//
//
findPreference("safe_mode").setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
SAFE_MODE = (Boolean) newValue;
myListener.change_mode(SAFE_MODE);
return true;
}
});activity中
private Boolean SAFE_MODE;
//
@Override
public void change_mode(Boolean mode) {
SAFE_MODE=mode;
}activity互相传值
MainActivity.java
SharedPreferences sp=getSharedPreferences("safe_mode",MODE_PRIVATE);
SAFE_MODE=sp.getBoolean("safe_mode",false);
//存储模式
//
Intent intent=new Intent(this,SettingsActivity.class);
startActivityForResult(intent,1);
//
//
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
switch (requestCode){
case 1:{
if (resultCode==RESULT_OK){
assert data != null;
SAFE_MODE=data.getBooleanExtra("safe_mode",false);
SharedPreferences sp=getSharedPreferences("safe_mode",MODE_PRIVATE);
sp.edit().putBoolean("safe_mode",SAFE_MODE).apply();
Toast.makeText(this, SAFE_MODE.toString(), Toast.LENGTH_SHORT).show();
}break;
}
default:
}
}SettingsActivity.java
Intent intent=new Intent(SettingsActivity.this,MainActivity.class);
intent.putExtra("safe_mode",SAFE_MODE);
setResult(RESULT_OK,intent);
finish();其实可以直接用SharedPreferences“传值”的，但是想多试一些方法，不过后面可能会用到这个方法来匹配密码，日后再说！