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：
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
三种方法：第四种不推荐，前三种酌情使用
布局文件：activity_main.xml
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_st">"match_parent"
android:layout_st">"match_parent"
tools:cOntext="${relativePackage}.${activityClass}" >
android:id="@+id/editText1"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:focusable="true"
android:focusableInTouchMode="true"
android:hint="在此输入电话号码">
android:id="@+id/button1"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:layout_below="@+id/editText1"
android:layout_marginTop="14dp"
android:text="拨打此号码" />
android:id="@+id/button2"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/button1"
android:text="Button2" />
android:id="@+id/button3"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/button2"
android:text="Button3" />
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;
}
}
}
}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();
}
});
}
}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;
}
}
}activity_main.xml
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_st">"match_parent"
android:layout_st">"match_parent"
tools:cOntext="${relativePackage}.${activityClass}" >
android:id="@+id/editText1"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:focusable="true"
android:focusableInTouchMode="true"
android:hint="在此输入电话号码">
android:id="@+id/button1"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:layout_below="@+id/editText1"
android:layout_marginTop="14dp"
android:OnClick="button"
android:text="拨打此号码" />
android:id="@+id/button2"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/button1"
android:OnClick="button"
android:text="Button2" />
android:id="@+id/button3"
android:layout_st">"wrap_content"
android:layout_st">"wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/button2"
android:OnClick="button"
android:text="Button3" />
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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