android按钮点击——implements View.OnC

还可以使用如下方式进行button的响应，就是不使用匿名内部类，可以直接让当前类实现OnClickListener接口即可。下面是原来的方式，通过代码我们可以看到--该方法为每一个button对象都设置了监听实践，非常繁琐，那么简单的方法就是当前您类直接实现监听方法

package com.example.peipeng.litepal_demo;

import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import org.litepal.LitePal;

public class MainActivity extends AppCompatActivity {

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

        Button create = findViewById(R.id.create_database);
        create.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                try{
                    SQLiteDatabase db = LitePal.getDatabase();
                }catch (Exception e){
                    Toast.makeText(MainActivity.this,"create database wrong ",Toast.LENGTH_SHORT).show();
                }

            }
        });

        Button save = findViewById(R.id.save_data);
        save.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                Album album = new Album();
                album.setId(1);
                album.setName("album");
                album.setPrice(10.99f);
                //album.setCover(getCoverImageBytes());
                album.save();
                Toast.makeText(MainActivity.this,"this save",Toast.LENGTH_SHORT).show();

            }
        });

        Button show = findViewById(R.id.show_data);
        show.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                //这里不清楚ID的值是多少，随便设置的ID，先尝试一下
                try{
                    Album album = LitePal.find(Album.class,1);
                    Toast.makeText(MainActivity.this,"the name is "+album.getName(),Toast.LENGTH_LONG).show();
                }catch (Exception e){
                    Toast.makeText(MainActivity.this,"something Wrong",Toast.LENGTH_SHORT).show();
                }

            }
        });

    }
}

下面是使用当前类实现onClickListener()接口的方式：

package com.example.peipeng.litepal_demo;

import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import org.litepal.LitePal;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LitePal.initialize(this);
        setContentView(R.layout.activity_main);
        Button create = findViewById(R.id.create_database);//实例化对象
        Button save = findViewById(R.id.save_data);
        Button show = findViewById(R.id.show_data);
        create.setOnClickListener(this);//对该对象设置监听事件
        save.setOnClickListener(this);
        show.setOnClickListener(this);

    }
    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.create_database:
                LitePal.getDatabase();
                break;
            case R.id.save_data:
                Album album = new Album();
                album.setId(1);
                album.setName("album");
                album.setPrice(10.99f);
                album.save();
                Toast.makeText(MainActivity.this,"this save",Toast.LENGTH_SHORT).show();

            case R.id.show_data:
                try{
                    Album album1 = LitePal.find(Album.class,1);
                    Toast.makeText(MainActivity.this,"the name is "+album1.getName(),Toast.LENGTH_LONG).show();
                }catch (Exception e){
                    Toast.makeText(MainActivity.this,"something Wrong",Toast.LENGTH_SHORT).show();
                }
                break;

        }
    }
}