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’