[Android] 点击事件的四种写法

来源：互联网发布：黑色编程界面编辑：程序博客网时间：2024/05/17 03:58

点击事件的必备条件：实现OnClickListener接口，重写onclick(View v)方法

以拨号简单案例为例，如下图效果：
拨号案例演示动画

逻辑流程：

获取点击对象，获取数据

给对象设置监听类

实现OnClickListener接口,重写onClick(View v)方法

onClick(View v)逻辑：

获取输入内容：使用EditText对象的getText()方法，该方法返回值为Editable，需要用toString()转换成String类型

判断输入是否为空，TextUtils.isEmpty(str)方法判断字符串str是否为空

为空则提示号码不能为空，使用Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_SHORT).show();,
Toast makeText (Context context, CharSequence text, int duration)返回值为Toast，参数列表（Context对象，提示内容，显示时长）

如果不为空，new一个Intent对象，使用Intent对象的setAction(String action)方法设置动作，使用Intent对象的setData(Uri uriData)方法设置数据。startActivity(Intent intent)方法启动Activity。

注：应该在程序清单文件AndroidManifest.xml中添加<uses-permission android:name="android.permission.CALL_PHONE"/>，拨打电话时，美国紧急电话不会直接拨打

三种方法：第四种不推荐，前三种酌情使用

1. 内部实现类

布局文件：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"    tools:context="${relativePackage}.${activityClass}" >    <EditText        android:id="@+id/editText1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:focusable="true"        android:focusableInTouchMode="true"        android:hint="在此输入电话号码">    </EditText>    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/editText1"        android:layout_marginTop="14dp"        android:text="拨打此号码" />    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/button1"        android:text="Button2" />    <Button        android:id="@+id/button3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/button2"        android:text="Button3" /></RelativeLayout>

MainActivity.java

    package com.example.onclick1;    import android.app.Activity;    import android.content.Intent;    import android.net.Uri;    import android.os.Bundle;    import android.os.storage.OnObbStateChangeListener;    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 Activity {        private EditText editText;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);            editText = (EditText) findViewById(R.id.editText1);            Button button1 = (Button) findViewById(R.id.button1);            Button button2 = (Button) findViewById(R.id.button2);            Button button3 = (Button) findViewById(R.id.button3);            //设置监听类            button1.setOnClickListener(new MyOnClickListener());            button2.setOnClickListener(new MyOnClickListener());            button3.setOnClickListener(new MyOnClickListener());        }        private class MyOnClickListener implements OnClickListener{            @Override            public void onClick(View v) {                int i = v.getId();                switch (i) {                case R.id.button1:                    String number = editText.getText().toString();                    if (TextUtils.isEmpty(number)) {                        Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_SHORT).show();                    }else {                        Intent intent = new Intent();                        intent.setAction(intent.ACTION_CALL);                        Uri data = Uri.parse("tel:"+number);                        intent.setData(data);                        startActivity(intent);                    }                    break;                case R.id.button2:                    Toast.makeText(MainActivity.this, "你点击了Button2", Toast.LENGTH_SHORT).show();                    break;                case R.id.button3:                    Toast.makeText(MainActivity.this, "你点击了Button3", Toast.LENGTH_SHORT).show();                    break;                }            }        }    }

2. 内部匿名类

MainActivity.java

    package com.example.onclick1;    import android.app.Activity;    import android.content.Intent;    import android.net.Uri;    import android.os.Bundle;    import android.os.storage.OnObbStateChangeListener;    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 Activity {        private EditText editText;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);            editText = (EditText) findViewById(R.id.editText1);            Button button1 = (Button) findViewById(R.id.button1);            Button button2 = (Button) findViewById(R.id.button2);            Button button3 = (Button) findViewById(R.id.button3);            //设置监听类            button1.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                    String number = editText.getText().toString();                    if(TextUtils.isEmpty(number)){                        Toast.makeText(MainActivity.this, "[内部匿名类]号码不能为空", Toast.LENGTH_SHORT).show();                    }else{                        Intent intent = new Intent();                        intent.setAction(intent.ACTION_CALL);                        intent.setData(Uri.parse("tel:"+number));                        startActivity(intent);                    }                }            });            button2.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                    Toast.makeText(MainActivity.this, "[内部匿名类]你点击了Button2", Toast.LENGTH_SHORT).show();                }            });            button3.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                    Toast.makeText(MainActivity.this, "[内部匿名类]你又点击了button3", Toast.LENGTH_SHORT).show();                }            });        }    }

3. Activity实现OnClickLitener

MainActivity.java

    package com.example.onclick1;    import android.app.Activity;    import android.content.Intent;    import android.net.Uri;    import android.os.Bundle;    import android.os.storage.OnObbStateChangeListener;    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 Activity implements OnClickListener{        private EditText editText;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);            editText = (EditText) findViewById(R.id.editText1);            Button button1 = (Button) findViewById(R.id.button1);            Button button2 = (Button) findViewById(R.id.button2);            Button button3 = (Button) findViewById(R.id.button3);            //设置监听类            button1.setOnClickListener(this);            button2.setOnClickListener(this);            button3.setOnClickListener(this);        }        @Override        public void onClick(View v) {            int id = v.getId();            switch (id) {            case R.id.button1:                String number = editText.getText().toString();                if (TextUtils.isEmpty(number)) {                    Toast.makeText(this, "[Activity实现类]号码不能为空", Toast.LENGTH_SHORT).show();                }else {                    Intent intent = new Intent();                    intent.setAction(intent.ACTION_CALL);                    intent.setData(Uri.parse("tel:"+number));                    startActivity(intent);                }                break;            case R.id.button2:                Toast.makeText(this, "[Activity实现类]你点击了Button2", Toast.LENGTH_SHORT).show();                break;            case R.id.button3:                Toast.makeText(this, "[Activity实现类]你点击了Button3", Toast.LENGTH_SHORT).show();                break;            }        }    }

4. 结合layout文件声明方法

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"        tools:context="${relativePackage}.${activityClass}" >        <EditText            android:id="@+id/editText1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:focusable="true"            android:focusableInTouchMode="true"            android:hint="在此输入电话号码">        </EditText>        <Button            android:id="@+id/button1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_below="@+id/editText1"            android:layout_marginTop="14dp"            android:onClick="button"            android:text="拨打此号码" />        <Button            android:id="@+id/button2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentLeft="true"            android:layout_below="@+id/button1"            android:onClick="button"            android:text="Button2" />        <Button            android:id="@+id/button3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentLeft="true"            android:layout_below="@+id/button2"            android:onClick="button"            android:text="Button3" />    </RelativeLayout>

MainActivity.java

    package com.example.onclick1;    import android.app.Activity;    import android.content.Intent;    import android.net.Uri;    import android.os.Bundle;    import android.os.storage.OnObbStateChangeListener;    import android.text.TextUtils;    import android.view.Menu;    import android.view.MenuItem;    import android.view.View;    import android.widget.EditText;    import android.widget.Toast;    public class MainActivity extends Activity{        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);        }        public void button(View v) {        EditText editText = (EditText) findViewById(R.id.editText1);            switch (v.getId()) {            case R.id.button1:                String number = editText.getText().toString();                if (TextUtils.isEmpty(number)) {                    Toast.makeText(this, "[布局文件中Button的android:onClick属性]号码不能为空", Toast.LENGTH_SHORT).show();                }else {                    Intent intent = new Intent();                    intent.setAction(intent.ACTION_CALL);                    intent.setData(Uri.parse("tel:"+number));                    startActivity(intent);                }                break;            case R.id.button2:                Toast.makeText(this, "[布局文件中Button的android:onClick属性]你点击了Button2", Toast.LENGTH_SHORT).show();                break;            case R.id.button3:                Toast.makeText(this, "[布局文件中Button的android:onClick属性]你点击了Button3", Toast.LENGTH_SHORT).show();                break;            }        }    }

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