Intellij IDEA开发第一个Android应用

1、创建一个项目

File——>New Project——>.......——>Finish

2、创建模块

3、MyActivity.java

package com.example.myapp;

import android.app.Activity;

import android.app.AlertDialog;

import android.os.Bundle;

import android.view.View;

import android.widget.Toast;

public class MyActivity extends Activity {

    /**

     * Called when the activity is first created.

     */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

    public void onMyButtonClick(View view){

        Toast.makeText(this,"你好！", Toast.LENGTH_SHORT).show();

    }

    public void onMyButton2Click(View view) {

        AlertDialog.Builder builder = new AlertDialog.Builder(MyActivity.this);

        builder.setTitle("标题");

        builder.setPositiveButton("确定",null);

        builder.setIcon(android.R.drawable.ic_dialog_info);

        builder.setMessage("简单消息框");

        builder.show();

    }

}

4、layout——>main.xml       （布局文件）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
        >
    <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Hello World,My name is LiuRui."
            />
    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="按钮1"
            android:onClick="onMyButtonClick"
            android:id="@+id/button" android:layout_gravity="center_horizontal"/>
    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="按钮2"
            android:onClick="onMyButton2Click"
            android:id="@+id/button2" android:layout_gravity="center_horizontal"/>
</LinearLayout>

5、values——>Strings.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="app_name">myapp</string>

    <string name="hello">Hello World!My name is LiuRui.</string>

</resources>

6、gen——>R.java

/*___Generated_by_IDEA___*/

package com.example.myapp;

/* This stub is only used by the IDE. It is NOT the R class actually packed into the APK */

public final class R {

    public static final class attr {

    }

    public static final class drawable {

        public static final int icon=0x7f020000;

    }

    public static final class layout {

        public static final int main=0x7f030000;

    }

}

7、运行

Run——>Run‘myapp’