Android 按钮事件两种经典写法

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集中处理

public class MainActivity extends AppCompatActivity {    private MyOnClickListener myOnClickListener;    private Button button1,button2,button3;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button1=(Button)findViewById(R.id.button1);        button2=(Button)findViewById(R.id.button2);        button3=(Button)findViewById(R.id.button3);        myOnClickListener=new MyOnClickListener();        myOnClickListener.setContext(getBaseContext());        button1.setOnClickListener(myOnClickListener);        button2.setOnClickListener(myOnClickListener);        button3.setOnClickListener(myOnClickListener);            }}class MyOnClickListener implements View.OnClickListener{    private Context context;    public void onClick(View v){        switch(v.getId()){            case  R.id.button1:                Toast.makeText(context,"button1",Toast.LENGTH_SHORT).show();                break;            case R.id.button2:                Toast.makeText(context,"button2",Toast.LENGTH_SHORT).show();                break;            case R.id.button3:                Toast.makeText(context,"button3",Toast.LENGTH_SHORT).show();                break;        }    }    public void setContext(Context contex){        this.context=contex;    }}

单个处理

public class MainActivity extends AppCompatActivity {    private Button button1, button2, button3;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button1 = (Button) findViewById(R.id.button1);        button2 = (Button) findViewById(R.id.button2);        button3 = (Button) findViewById(R.id.button3);        button1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(getBaseContext(),"Button1",Toast.LENGTH_SHORT).show();            }        });        button2.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(getBaseContext(),"button2",Toast.LENGTH_SHORT).show();            }        });        button3.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(getBaseContext(),"button3",Toast.LENGTH_SHORT).show();            }        });    }}

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