android基础（一）：控制UI界面

一：xml布局文件控制UI界面

activity_main.xml

<FrameLayoutxmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/title"

        style="@style/text"/>

    <TextView

        android:id="@+id/startButton"

        android:layout_gravity="center_vertical|center_horizontal"

        android:text="@string/start"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        style="@style/text"

        />

</FrameLayout>

strings.xml

<?xmlversion="1.0"encoding="utf-8"?>

<resources>

    <stringname="app_name">Android1</string>

    <stringname="action_settings">Settings</string>

    <stringname="hello_world">Hello world!</string>

    <stringname="title">使用xml布局文件控制UI界面</string>

    <stringname="start">单击开始游戏</string>

</resources>

styles.xml

<stylename="text">

        <itemname="android:textSize">24px</item>

        <itemname="android:textColor">#111111</item>

</style>

二：在代码中控制UI界面

@SuppressLint("NewApi")

publicclass MainActivity extends Activity {

    public TextViewtext2;

    @Override

    protectedvoid onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

       FrameLayout framelayout=new FrameLayout(this);

       setContentView(framelayout);

       TextView text1=new TextView(this);

       text1.setText("在代码中控制UI界面");

       //设置文字大小，单位像素

       text1.setTextSize(TypedValue.COMPLEX_UNIT_PX, 24);

       text1.setTextColor(Color.rgb(1, 1, 1));

       framelayout.addView(text1);

       text2=new TextView(this);

       text2.setText("单击进入游戏...");

       text2.setTextSize(TypedValue.COMPLEX_UNIT_PX,24);

       text2.setTextColor(Color.rgb(1, 1, 1));

       LayoutParams params=new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,

              ViewGroup.LayoutParams.WRAP_CONTENT);

       params.gravity=Gravity.CENTER_HORIZONTAL|Gravity.CENTER_VERTICAL;

       text2.setLayoutParams(params);

       text2.setOnClickListener(new OnClickListener() {

           @Override

           publicvoid onClick(View v) {

              new AlertDialog.Builder(MainActivity.this).setTitle("系统提示")

              .setMessage("真的要进入游戏吗")

              .setPositiveButton("确定",new DialogInterface.OnClickListener() {

                  @Override

                  publicvoid onClick(DialogInterface dialog, int which) {

                     // TODO Auto-generatedmethod stub

                     Log.i("3.2","进入游戏");

                  };

              }).setNegativeButton("退出",new DialogInterface.OnClickListener() {

                  @Override

                  publicvoid onClick(DialogInterface arg0, int arg1) {

                     // TODO Auto-generatedmethod stub

                     Log.i("3.2","退出游戏");

                     finish();

                  }

              }).show();

           }

       });

       framelayout.addView(text2);

    }

    @Override

    publicboolean onCreateOptionsMenu(Menu menu) {

       // Inflate the menu; thisadds items to the action bar if it is present.

       getMenuInflater().inflate(R.menu.main, menu);

       returntrue;

    }

}