android学习笔记003-点击事件的四种写法

一个按钮对点击事件相应的四种方法。

1、通过新建一个借口类来具体实现点击时间的响应：

package com.example.dailcall;



import android.support.v7.app.ActionBarActivity;

import android.text.TextUtils;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;//创建 OnClickListener接口的时候要导入这个包

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;





public class MainActivity extends ActionBarActivity {



    // 定义组建

    private EditText et;

    private Button btn;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。

        btn=(Button) findViewById(R.id.btn_dail);

        btn.setOnClickListener(new MyClickListener());//通过新建一个借口类来具体实现点击时间的响应。

      

    }

    

    private class MyClickListener implements OnClickListener{



        @Override

        public void onClick(View v) {

            // TODO Auto-generated method stub

            

            callNumber();

            

        }

        

        

        

    }





    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }



    private void callNumber() {

        Intent intent=new Intent();

        

        String number=et.getText().toString().trim();

        

        if (TextUtils.isEmpty(number)) {

            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();

            return;

        }

        

        intent.setAction(Intent.ACTION_CALL);

        intent.setData(Uri.parse("tel:"+number));

        

        startActivity(intent);

    }

}

2、通过new一个匿名内部类类实现：

package com.example.dailcall;



import android.support.v7.app.ActionBarActivity;

import android.text.TextUtils;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;//创建 OnClickListener接口的时候要导入这个包

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;





public class MainActivity extends ActionBarActivity {



    // 定义组建

    private EditText et;

    private Button btn;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。

        btn=(Button) findViewById(R.id.btn_dail);

        btn.setOnClickListener(new OnClickListener() {

            

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                callNumber();

            }

        });

      

    }





    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }



    private void callNumber() {

        Intent intent=new Intent();

        

        String number=et.getText().toString().trim();

        

        if (TextUtils.isEmpty(number)) {

            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();

            return;

        }

        

        intent.setAction(Intent.ACTION_CALL);

        intent.setData(Uri.parse("tel:"+number));

        

        startActivity(intent);

    }

}

 3、让MainActivity来实现点击时间的借口

package com.example.dailcall;



import android.support.v7.app.ActionBarActivity;

import android.text.TextUtils;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;//创建 OnClickListener接口的时候要导入这个包

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Switch;

import android.widget.Toast;





public class MainActivity extends ActionBarActivity implements OnClickListener {



    // 定义组建

    private EditText et;

    private Button btn;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。

        btn=(Button) findViewById(R.id.btn_dail);

        btn.setOnClickListener(this);

      

    }





    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }



    private void callNumber() {

        

        Intent intent=new Intent();

        String number=et.getText().toString().trim();

        if (TextUtils.isEmpty(number)) {

            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();

            return;

        }

        

        intent.setAction(Intent.ACTION_CALL);

        intent.setData(Uri.parse("tel:"+number));

        

        startActivity(intent);

    }





    @Override

    public void onClick(View v) {

        // TODO Auto-generated method stub

        switch (v.getId()) {

        case R.id.btn_dail:

            

            callNumber();

            break;



        default:

            break;

        }

    }

}

4、在布局文件中button的按钮里边定义一个onclick的属性：

package com.example.dailcall;



import android.support.v7.app.ActionBarActivity;

import android.text.TextUtils;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;//创建 OnClickListener接口的时候要导入这个包

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;





public class MainActivity extends ActionBarActivity {



    // 定义组建

    private EditText et;

    private Button btn;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        et=(EditText) findViewById(R.id.et_number); //通过findViewById来查找组建名，绑定到定义的组建变量。

        btn=(Button) findViewById(R.id.btn_dail);

        

      

    }



    public void btndail(View view){

        callNumber();

    }



    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }



    private void callNumber() {

        Intent intent=new Intent();

        

        String number=et.getText().toString().trim();

        

        if (TextUtils.isEmpty(number)) {

            Toast.makeText(MainActivity.this, "电话号码不能为空！", 0).show();

            return;

        }

        

        intent.setAction(Intent.ACTION_CALL);

        intent.setData(Uri.parse("tel:"+number));

        

        startActivity(intent);

    }

}

其中button的定义文件为：

   <Button

        android:onClick="btndail"

        android:id="@+id/btn_dail"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/et_number"

        android:text="@string/dail" />