Android 0621 assignment

1.

參考連結：http://pulse7.net/android/login-dialog-box-android/
MainActivity.java

package com.example.mycs.alertdialoglogin;

import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.method.PasswordTransformationMethod;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    public void btnClicked (View view) {
        LayoutInflater inflater = getLayoutInflater();
        @SuppressLint("InflateParams") View alertLayout = inflater.inflate(R.layout.login_dialog, null);
        final EditText etUsername = alertLayout.findViewById(R.id.textUsername);
        final EditText etPassword = alertLayout.findViewById(R.id.textPassword);
        final CheckBox cbToggle = alertLayout.findViewById(R.id.cb_show_pass);

        cbToggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
                if (isChecked) {
                    etPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());
                } else {
                    etPassword.setTransformationMethod(null);
                }
            }
        });

        AlertDialog.Builder login = new AlertDialog.Builder(this);
        login.setTitle("Login");
        login.setView(alertLayout);
        login.setCancelable(false);
        login.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(getBaseContext(), "Cancel clicked.", Toast.LENGTH_SHORT).show();
            }
        });
        login.setPositiveButton("Login", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                String user = etUsername.getText().toString();
                String pass = etPassword.getText().toString();
                Toast.makeText(getBaseContext(), "User: " + user + " Password: " + pass + " Logged in.", Toast.LENGTH_LONG).show();
            }
        });
        AlertDialog dialog = login.create();
        dialog.show();
    }

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

心得：學到如何實作顯示密碼欄位內容，覺得有用。

2.

參考連結︰https://www.android-examples.com/show-create-alertdialog-with-multiple-choices-in-android/
MainActivity.java

package com.example.mycs.multichoicedialog;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Arrays;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    Button button;
    TextView textView;

    AlertDialog.Builder alertDialogBuilder;
    String[] alertDialogItems = new String[] {
            "美味蟹堡", "義式香腸堡", "蔬菜水果堡", "香蕉潛艇堡", "香烤雞腿堡"
    };

    List<string> itemsIntoList;

    boolean[] selected = new boolean[] {
            false, false, false, false, false
    };

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

        button = findViewById(R.id.button);
        textView = findViewById(R.id.textView);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                textView.setText("");
                alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
                itemsIntoList = Arrays.asList(alertDialogItems);
                alertDialogBuilder.setMultiChoiceItems(alertDialogItems, selected, new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i, boolean b) {

                    }
                });
                alertDialogBuilder.setCancelable(false);
                alertDialogBuilder.setTitle("您點的餐點有&#65306;");
                alertDialogBuilder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        int index = 0;
                        while (index &lt; selected.length) {
                            boolean value = selected[index];
                            if (value) {
                                textView.setText(String.format("%s%s\n", textView.getText(), itemsIntoList.get(index)));
                            }
                            index++;
                        }
                    }
                });
                alertDialogBuilder.setNeutralButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {

                    }
                });
                AlertDialog diaLog = alertDialogBuilder.create();
                diaLog.show();
            }
        });
    }
}
</string>

心得：蠻直覺的，沒用到DialogFragment之類的東東，簡明易懂，基本上直接讀code就知道每一行程式碼是在做些什麼事情，應該可以輕易地改成Button的onClick實做。



3.

參考連結：https://youtu.be/33BFCdL0Di0
MainActivity.java

package com.example.mycs.datepickdialog;

import android.annotation.TargetApi;
import android.app.DatePickerDialog;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

import java.text.DateFormat;
import java.util.Calendar;

public class MainActivity extends AppCompatActivity
        implements View.OnClickListener {

    Button button;
    TextView textView;

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

        button = findViewById(R.id.button);
        textView = findViewById(R.id.textView);

        button.setOnClickListener(this);
    }

    @TargetApi(Build.VERSION_CODES.N)
    @RequiresApi(api = Build.VERSION_CODES.N)
    @Override
    public void onClick(View view) {
        final Calendar calendar = Calendar.getInstance();
        int mYear = calendar.get(Calendar.YEAR);
        int mMonth = calendar.get(Calendar.MONTH);
        int mDay = calendar.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog datePickerDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {

            @Override
            public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                Calendar cal = Calendar.getInstance();
                cal.set(Calendar.YEAR, year);
                cal.set(Calendar.MONTH, month);
                cal.set(Calendar.DAY_OF_MONTH, dayOfMonth);

                String currentDateString = DateFormat.getDateInstance(DateFormat.FULL).format(cal.getTime());
                textView.setText(currentDateString);
            }
        }, mYear, mMonth, mDay);
        datePickerDialog.show();
    }
}

心得：要呼叫DatePickerDialog得要先傳值給它，不然他就是不開，然後API也要24以上，真任性！

4. 搭配ProgressBar的ProgressDialog

參考連結：https://www.journaldev.com/9652/android-progressdialog-example
MainActivity.java

package com.example.mycs.progressdialog;

import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button button;
    ProgressDialog progressDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                progressDialog = new ProgressDialog(MainActivity.this);
                progressDialog.setMax(100);
                progressDialog.setMessage("It's loading...");
                progressDialog.setTitle("Progress Dialog with bar example");
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.show();
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            while (progressDialog.getProgress() <= progressDialog.getMax()) {
                                Thread.sleep(200);
                                handle.sendMessage(handle.obtainMessage());
                                if(progressDialog.getProgress() == progressDialog.getMax()) {
                                    progressDialog.dismiss();
                                }
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
            @SuppressLint("HandlerLeak")
            Handler handle = new Handler() {
                @Override
                public void handleMessage(Message msg) {
                    super.handleMessage(msg);
                    progressDialog.incrementProgressBy(1);
                }
            };
        });
    }
}

心得：因為ProgressDialog本身要在原地等候ProgressBar跑完不能動，所以調用一個新的執行緒(Thread)，來handle進度。