Android setSingleChoiceItems，setMultiChoiceItems，setItems及页面跳转（1）---加上生命周期小部分

• 界面布局
  • 
• single
  • 
• multi
  • 
• items
  • 
• 页面跳转
  • 
• 接收传值　
• 　
• 图标来源：阿里巴巴矢量图标库
• 代码部分
  • MainActivity.java

package com.example.lifecircle_activs;

import androidx.appcompat.app.AppCompatActivity;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    Button btn_single,btn_multi,btn_items,btn_link;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d("activs","onCreate.-----1");

        final String [] lan = {"c","c++","java","python","html","js"};
        final boolean [] lan_used = {true,false,true,true,true,true};

        btn_single = findViewById(R.id.button);
        btn_multi = findViewById(R.id.button2);
        btn_items = findViewById(R.id.button3);
        btn_link = findViewById(R.id.button4);

        //1.SingleChoiceItems
        btn_single.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("Single Choice Items Test"+"\n"+"选出你最喜欢的语言");
                builder.setIcon(R.drawable.single);
                builder.setSingleChoiceItems(lan, 2, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this,"你最喜欢的语言是:"+lan[which],Toast.LENGTH_LONG).show();
                    }
                });
                builder.create().show();
            }
        });

        //2.multi
        btn_multi.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("Single Choice Items Test"+"\n"+"选出你使用过的语言");
                builder.setIcon(R.drawable.multi);
                builder.setMultiChoiceItems(lan, lan_used, new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        Toast.makeText(MainActivity.this,lan[which]+":"+isChecked,Toast.LENGTH_LONG).show();
                    }
                });
                builder.create().show();
            }
        });

        //3.Items
        btn_items.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("Items Test"+"\n"+"选择使用时间最长的语言");
                builder.setIcon(R.drawable.items);
                builder.setItems(lan, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this,"你使用时间最长的语言是:"+lan[which],Toast.LENGTH_LONG).show();
                    }
                });
                builder.create().show();
            }
        });

        //4.link
        btn_link.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
//                builder.setTitle("请输入账号密码");
//                builder.setIcon(R.drawable.link);
//                LayoutInflater inflater = MainActivity.this.getLayoutInflater();
//                View loginView = inflater.inflate(R.layout.login_view,null);
//                builder.setView(loginView);
                builder.setTitle("点击是登录，点击否退出");
                builder.setIcon(R.drawable.link);
                builder.setPositiveButton("是", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                        Bundle bundle = new Bundle();
                        bundle.putStringArray("lan",lan);
                        intent.putExtras(bundle);
                        startActivity(intent);
                    }
                });
                builder.setNegativeButton("否", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        MainActivity.this.finish();
                    }
                });
                builder.create().show();
            }
        });

    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.d("activs","onStart.-----1");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d("activs","onStop.-----1");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d("activs","onDestroy.-----1");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.d("activs","onPause.-----1");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.d("activs","onResume.-----1");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.d("activs","onRestart.-----1");
    }
}

• • Main2Activity

package com.example.lifecircle_activs;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Log.d("activs","onCreate.-----2");

        Intent intent = this.getIntent();
        String [] lan_get = intent.getStringArrayExtra("lan");
        TextView tv = findViewById(R.id.textView);
        for (String s :lan_get){
            tv.append("\n"+s+"-----language");
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.d("activs","onStart.-----2");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d("activs","onStop.-----2");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d("activs","onDestroy.-----2");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.d("activs","onPause.-----2");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.d("activs","onResume.-----2");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.d("activs","onRestart.-----2");
    }
}

• 跳转动作及相应结果

打开app：
2020-05-10 17:01:15.015 32135-32135/? D/activs: onCreate.-----1
2020-05-10 17:01:15.021 32135-32135/? D/activs: onStart.-----1
2020-05-10 17:01:15.024 32135-32135/? D/activs: onResume.-----1

点击跳转按钮并选择是：
2020-05-10 17:01:52.172 32135-32135/com.example.lifecircle_activs D/activs: onPause.-----1
2020-05-10 17:01:52.209 32135-32135/com.example.lifecircle_activs D/activs: onCreate.-----2
2020-05-10 17:01:52.226 32135-32135/com.example.lifecircle_activs D/activs: onStart.-----2
2020-05-10 17:01:52.228 32135-32135/com.example.lifecircle_activs D/activs: onResume.-----2
2020-05-10 17:01:52.828 32135-32135/com.example.lifecircle_activs D/activs: onStop.-----1

点击返回键退回到a1:
2020-05-10 17:03:43.882 32135-32135/com.example.lifecircle_activs D/activs: onPause.-----2
2020-05-10 17:03:43.893 32135-32135/com.example.lifecircle_activs D/activs: onRestart.-----1
2020-05-10 17:03:43.893 32135-32135/com.example.lifecircle_activs D/activs: onStart.-----1
2020-05-10 17:03:43.895 32135-32135/com.example.lifecircle_activs D/activs: onResume.-----1
2020-05-10 17:03:44.475 32135-32135/com.example.lifecircle_activs D/activs: onStop.-----2
2020-05-10 17:03:44.477 32135-32135/com.example.lifecircle_activs D/activs: onDestroy.-----2

（以上未在ac2中添加跳转1的代码）

• 出现的问题：
  • 多选中需要boolean[]，长度需要和string[]长度相同；
  • 想在activity的跳转中加布局来输入账号密码，只有账号密码相同时才能跳转，但是R.layout.*就是一直红的报错，尝试删除、创建了好几次emmm。可能是布局问题？？？
  • 刚开始只想做两个activity的跳转加生命周期的输出，但是程序会崩溃，而且有趣的是代码没错，那就是逻辑出了问题？应该不会吧，只是加了log来输出生命周期阶段调用的函数呀。
  • 有空再整生命周期啦，就是几个方法的重写罢了。