Android菜鸟笔记01:电话拨号器

一，界面：

二，需求：输入电话号码，点击“拨号”按钮，调用系统自带拨号器拨打电话

三,知识点：

1，根据id查找View

2，为按钮添加点击事件

3，意图知识

四，代码:

MainActivity.java：

package im.qvod.phone;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
    private EditText num;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) this.findViewById(R.id.button);
        num = (EditText) findViewById(R.id.num);
        button.setOnClickListener(new ButtonClickListener());
    }

    private final class ButtonClickListener implements View.OnClickListener {
        public void onClick(View v) {
            String number = num.getText().toString();
            Intent intent = new Intent();
            intent.setAction("android.intent.action.CALL");
            // intent.addCategory("android.intent.category.DEFAULT");
            intent.setData(Uri.parse("tel:" + number));
            startActivity(intent);// 方法内部会自动为Intent添加类别:android.intent.category.DEFAULT

        }

    }
//    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;
//    }

}

 

activity_main.xml:

　　

<LinearLayout 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:orientation="vertical"
    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=".MainActivity" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/num" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/numEdit" 
        android:id="@+id/num"
        />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="@string/buttonText" />

</LinearLayout>