常用控件

1. 日期选择器 比较丑，可能用的很少

public class MainActivity extends ActionBarActivity {


    private Button btn = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn = (Button) this.findViewById(R.id.btnChoose);
        btn.setOnClickListener(new View.OnClickListener() {  // 定义了一个按钮，然后点显示日期组件
            @Override
            public void onClick(View v) {
                new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {  // 当日期选择的时候
                        String date = String.format("%d-%d-%d", year, month, dayOfMonth);
                        btn.setText(date);       // 改变按钮的text
                        System.out.print(date);  // 打印
                    }
                }, 2016, 1, 1).show();
            }
        });

        System.out.println("onCreate");
    }


}

 2. 时间控件

public class MainActivity extends ActionBarActivity {


    private Button btn = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn = (Button) this.findViewById(R.id.btnChoose);
        btn.setOnClickListener(new View.OnClickListener() {  // 定义了一个按钮，然后点显示时间控件
            @Override
            public void onClick(View v) {
                // 创建一个时间控件
               new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
                   @Override
                   public void onTimeSet(TimePicker view, int hourOfDay, int minute) {  // 选择时间市，相应
                       String s = String.format("%d:%d", hourOfDay, minute);
                       btn.setText(s);
                   }
               }, 0, 0, true).show();
            }
        });

        System.out.println("onCreate");
    }
    
}

 3. 单选按钮

 视图xml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="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="世界上最大的洋?"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:id="@+id/textView2" />


    <!-- 单选组，单选按钮必须要放一个RadioGroup -->
    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">


        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="A.大西洋"
            android:id="@+id/rbA" />

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="B.太平洋"
            android:id="@+id/rbB" />

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="C.印度洋"
            android:id="@+id/rbC" />



    </RadioGroup>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="提交"
        android:id="@+id/btnChoose" />


</LinearLayout>

Activity

public class MainActivity extends ActionBarActivity {


    private Button btn = null;
    private RadioButton rbA = null;   // 单选按钮A
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn = (Button) this.findViewById(R.id.btnChoose);
        rbA = (RadioButton) this.findViewById(R.id.rbA);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(rbA.isChecked()) {   // 当选择是正确的
                    // 提示
                    Toast.makeText(MainActivity.this, "所选是正确的", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(MainActivity.this, "所选是错误的", Toast.LENGTH_SHORT).show();
                }
            }
        });

        System.out.println("onCreate");
    }

}

 4. 多选按钮

视图xml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="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="你喜欢吃那些食物？"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:id="@+id/textView2" />

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="苹果"
        android:id="@+id/cb1" />

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="香蕉"
        android:id="@+id/cb2" />

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="桃子"
        android:id="@+id/cb3" />

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="西瓜"
        android:id="@+id/cb4" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="你喜欢"
        android:id="@+id/tvLove" />


</LinearLayout>

activity 文件

public class MainActivity extends ActionBarActivity
        implements CompoundButton.OnCheckedChangeListener {    // 实现 CompoundButton.OnCheckedChangeListener

    private CheckBox cb1,cb2,cb3,cb4;  // 定义4个多选按钮
    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cb1 = (CheckBox) this.findViewById(R.id.cb1);
        cb2 = (CheckBox) this.findViewById(R.id.cb2);
        cb3 = (CheckBox) this.findViewById(R.id.cb3);
        cb4 = (CheckBox) this.findViewById(R.id.cb4);

        tv = (TextView) this.findViewById(R.id.tvLove);

        cb1.setOnCheckedChangeListener(this);
        cb2.setOnCheckedChangeListener(this);
        cb3.setOnCheckedChangeListener(this);
        cb4.setOnCheckedChangeListener(this);


        System.out.println("onCreate");
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {  // 当多选按钮变化的时候
        String str = "你喜欢";
        if (cb1.isChecked()) {
            str += cb1.getText() + ", ";
        }
        if (cb2.isChecked()) {
            str += cb2.getText() + ", ";
        }
        if (cb3.isChecked()) {
            str += cb3.getText() + ", ";
        }
        if (cb4.isChecked()) {
            str += cb4.getText() + ", ";
        }

        tv.setText(str);    //改变文本
    }
}

5. 下拉列表

① 在代码里面生成 下拉的数据

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="选择你的血型"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:id="@+id/spinnerText" />

    <Spinner
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/spinner" />
</LinearLayout>

public class MainActivity extends ActionBarActivity{

    private static final String[] m = {"A型", "B型", "O型", "AB型", "其他"};
    private TextView tv;
    private Spinner spinner;
    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv = (TextView) this.findViewById(R.id.spinnerText);
        spinner = (Spinner) this.findViewById(R.id.spinner);

        // 将可选内容和 ArrayAdapter 连接
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m);
        // 设置下拉风格
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // 将 adapter添加到apinner中
        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                tv.setText("你的血型是 " + m[position]);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {}
        });

        //设置默认值
        spinner.setVisibility(View.VISIBLE);

        System.out.println("onCreate");
    }

}

② 下拉框的数据用xml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="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="选择你的血型"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:id="@+id/spinnerText" />

    <Spinner
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/spinner" />
</LinearLayout>

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

<!-- 创建apinnerArray.xml -->
<resources>
    <string-array name="plantes">
        <item>A型</item>
        <item>B型</item>
        <item>O型</item>
        <item>AB型</item>
        <item>其他</item>
    </string-array>
</resources>

public class MainActivity extends ActionBarActivity{
    private TextView tv;
    private Spinner spinner;
    private ArrayAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv = (TextView) this.findViewById(R.id.spinnerText);
        spinner = (Spinner) this.findViewById(R.id.spinner);

        // 这里创建的adapter的数据是 apinnerArray.xml 里面的数据 
        adapter = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item);
        // 设置下拉风格
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // 将 adapter添加到apinner中
        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                tv.setText("你的血型是 " + adapter.getItem(position)); // 这里获取值的话 就从adpter中获取
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {}
        });

        //设置默认值
        spinner.setVisibility(View.VISIBLE);

        System.out.println("onCreate");
    }

}