Android点击事件的4种写法

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.phonecall.MainActivity" >    <EditText        android:id="@+id/call_phone"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="23dp"        android:ems="10"        android:inputType="phone" >        <requestFocus />    </EditText>    <Button        android:id="@+id/dial"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/call_phone"        android:layout_below="@+id/call_phone"        android:layout_marginTop="18dp"        android:text="@string/dial" />    </RelativeLayout>

1、2、3三种方法都是用上面的UI界面

1、创建一个内部类 定义点击事件

MainActivity.java

package com.example.phonecall;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.text.TextUtils;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends ActionBarActivity{private Button dial  = (Button) this.findViewById(R.id.dial);;private EditText call_number = (EditText) this.findViewById(R.id.call_phone);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        dial.setOnClickListener(new MyListener());    }<pre name="code" class="java">    private MyListener implements OnClickListener{    String number = call_number.getText().toString().trim();if (TextUtils.isEmpty(number)) {Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_SHORT).show();return;}//意图干一件什么事情Intent intent = new Intent();intent.setAction(Intent.ACTION_CALL);intent.setData(Uri.parse("tel:"+number));startActivity(intent);break;    }            @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);    }}

2、采用匿名内部类

MainActivity.java

package com.example.phonecall;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.text.TextUtils;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends ActionBarActivity{private Button dial  = (Button) this.findViewById(R.id.dial);;private EditText call_number = (EditText) this.findViewById(R.id.call_phone);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                dial.setOnClickListener(new OnClickListener(){        @Override    public void onClick(View v) {    // TODO Auto-generated method stub    String number = call_number.getText().toString().trim();        if (TextUtils.isEmpty(number)) {Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_SHORT).show();return;}    //意图干一件什么事情    Intent intent = new Intent();    intent.setAction(Intent.ACTION_CALL);        intent.setData(Uri.parse("tel:"+number));    startActivity(intent);    }        });            }            @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);    }}

3、接口里面为实现的方法(常用写法)

MainActivity.java

package com.example.phonecall;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.text.TextUtils;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends ActionBarActivity implements OnClickListener{private Button dial  = (Button) this.findViewById(R.id.dial);;private EditText call_number = (EditText) this.findViewById(R.id.call_phone);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);       <span style="color:#ff0000;"> dial.setOnClickListener(this);</span>    }        @Overridepublic void onClick(View v) {// TODO Auto-generated method stub    switch (v.getId()) {case R.id.call_phone:String number = call_number.getText().toString().trim();if (TextUtils.isEmpty(number)) {Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_SHORT).show();return;}//意图干一件什么事情Intent intent = new Intent();intent.setAction(Intent.ACTION_CALL);intent.setData(Uri.parse("tel:"+number));startActivity(intent);break;default:break;}}        @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);    }}

4、在UI界面上写明要调用的函数

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.phonecall.MainActivity" >    <EditText        android:id="@+id/call_phone"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="23dp"        android:ems="10"        android:inputType="phone" >        <requestFocus />    </EditText>    <Button        <span style="color:#ff0000;">android:onClick="dialButtonClicked"</span>        android:id="@+id/dial"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/call_phone"        android:layout_below="@+id/call_phone"        android:layout_marginTop="18dp"        android:text="@string/dial" />    </RelativeLayout>

MainActivity.java

package com.example.phonecall;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.text.TextUtils;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends ActionBarActivity{private EditText call_number = (EditText) this.findViewById(R.id.call_phone);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    private MyListener implements OnClickListener{    String number = call_number.getText().toString().trim();if (TextUtils.isEmpty(number)) {Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_SHORT).show();return;}//意图干一件什么事情Intent intent = new Intent();intent.setAction(Intent.ACTION_CALL);intent.setData(Uri.parse("tel:"+number));startActivity(intent);break;    }    public void dialButtonClicked(View v) {    String number = call_number.getText().toString().trim();if (TextUtils.isEmpty(number)) {Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_SHORT).show();return;}//意图干一件什么事情Intent intent = new Intent();intent.setAction(Intent.ACTION_CALL);intent.setData(Uri.parse("tel:"+number));startActivity(intent);}                @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);    }}