Android(安卓)实现监听事件的几种方法

一、通过内部类实现

public class EventActivity extends AppCompatActivity {    private Button mBtnEvent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_event);        mBtnEvent=findViewById(R.id.btn_event_second);        //内部类实现        mBtnEvent.setOnClickListener(new OnClick());    }        class OnClick implements View.OnClickListener{        @Override        public void onClick(View v) {            switch (v.getId()){                case R.id.btn_event_second:                    ToastUtil.showMsg(EventActivity.this,"click...");                    break;            }        }    }}

二、通过匿名内部类实现

public class EventActivity extends AppCompatActivity {    private Button mBtnEvent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_event);        mBtnEvent=findViewById(R.id.btn_event_second);        //匿名内部类        mBtnEvent.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                ToastUtil.showMsg(EventActivity.this,"click...");            }        });    }}

三、通过事件源所在类实现

public class EventActivity extends AppCompatActivity implements View.OnClickListener{    private Button mBtnEvent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_event);        mBtnEvent=findViewById(R.id.btn_event_second);        mBtnEvent.setOnClickListener(EventActivity.this);    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.btn_event_second:                ToastUtil.showMsg(EventActivity.this,"click...");                break;        }    }   }

四、通过外部类实现

新建一个外部类：

public class MyClickListener implements View.OnClickListener {    private Activity mActivity;    public MyClickListener(Activity activity){        this.mActivity=activity;    }    @Override    public void onClick(View v) {        ToastUtil.showMsg(mActivity, "click.....");    }}

调用外部类构造方法：

public class EventActivity extends AppCompatActivity {    private Button mBtnEvent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_event);                mBtnEvent.setOnClickListener(new MyClickListener(EventActivity.this));    }  }

五、布局文件中 onClick 属性实现

布局文件添加 onClick ：

    <Button        android:id="@+id/btn_event_second"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="click me"        android:textAllCaps="false"        android:onClick="show"/>

Activity 文件添加 onClick 中调用的方法：

public class EventActivity extends AppCompatActivity {    private Button mBtnEvent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_event);    }    public void show(View view){        switch (view.getId()){            case R.id.btn_event_second:                ToastUtil.showMsg(EventActivity.this,"click from show");                break;        }    }}


♥ 喜欢请点赞哟 ♥
(●ˇ∀ˇ●)

更多相关文章

随机推荐