本文共 6885 字，大约阅读时间需要 22 分钟。

一、Button

1 SetImage

1.1 设置button背景图片

android:background=”@drawable/background1” //设置button的背景图片

1.2 设置button的点击效果（点击时button背景图切换）

res -- drawable -- 新建xml:background_bg.xml。

background_bg.xml：

button的background属性设置为：

android:background="@drawable/background_bg"

2 常用事件： onClick 和 onLongClick

设置button的onClick 和 onLongClick事件：

package com.example.chenjinhua.formwidgit;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;public class FormWidgitActivity extends AppCompatActivity {
       @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_form_widgit);        showButton();    }    public void showButton(){        Button button1 = (Button) findViewById(R.id.button1);        button1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Log.i("jinhuatag","click button");            }        });        button1.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View view) {                Log.i("jinhuatag","button longclicked");                return true;            }        });    }}

二、ToggleButton

1、 做漂亮的背景图

2、增加事件 onCheckedChanged

package com.example.chenjinhua.formwidgit;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.CompoundButton;import android.widget.Toast;import android.widget.ToggleButton;public class FormWidgitActivity extends AppCompatActivity {
       private ToggleButton toggleButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_form_widgit);        showToggleButton();    }    public void showToggleButton(){         toggleButton = (ToggleButton) findViewById(R.id.toggleButton);         toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {                if(b){                    toggleButton.setBackgroundResource(R.drawable.button1);                    Toast.makeText(FormWidgitActivity.this, "开", 100).show();                }else{                    toggleButton.setBackgroundResource(R.drawable.button2);                    Toast.makeText(FormWidgitActivity.this,"关",100).show();                }            }        });    }}

注意：ToggleButton要设置BackGround的默认属性：android:background=”@drawable/button2”

1)toggleButton.setBackgroundResource(R.drawable.button1); //设置状态下背景图片；

2)toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {} //点击状态

三、CheckBox

package com.example.chenjinhua.formwidgit;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.CheckBox;import android.widget.Toast;public class FormWidgitActivity extends AppCompatActivity {
       private CheckBox checkBox;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_form_widgit);        showCheckBox();    }    public void showCheckBox() {        checkBox = (CheckBox) findViewById(R.id.checkBox);        checkBox.setText("确定要链接wifi吗？");        checkBox.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                if(checkBox.isChecked()){                    Toast.makeText(FormWidgitActivity.this,"选中",300).show();                }                if (!checkBox.isChecked()){                    Toast.makeText(FormWidgitActivity.this,"未选中",300).show();                }            }        });    }}

checkBox.setText(“确定要链接wifi吗？”); //设置文案

四、RadioButton & RadioGroup

1、设置图片

package com.example.chenjinhua.formwidgit;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.RadioGroup;import android.widget.Toast;public class FormWidgitActivity extends AppCompatActivity {
       private RadioGroup radioGroup;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_form_widgit);        showRadioGroup();    }    public void showRadioGroup(){        radioGroup = (RadioGroup) findViewById(R.id.radioGroup);        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup radioGroup, int i) {                switch (i){                    case R.id.radioButton1:                        Toast.makeText(FormWidgitActivity.this,"radioButton1 clicked",100).show();                    case R.id.radioButton2:                        Toast.makeText(FormWidgitActivity.this,"radioButton2 clicked",100).show();                    case R.id.radioButton3:                        Toast.makeText(FormWidgitActivity.this,"radioButton3 clicked",100).show();                        break;                }            }        });    }}

3、去掉固有图形或者改变位置

运行结果：

1、android:button=”@null” //设置不显示默认的左边按钮

2、android:drawableLeft=”@drawable/girl” //设置图片

3、android:drawableRight=”@android:drawable/btn_star” //在右边设置系统提供的图标。

4、RadioGroup做工具条

五、Spinner

所以界面显示的步骤是：

1、建立数据源

2、建立adapter

3、建立adapter与数据源连接

4、绑定adapter到界面组件

2、android常用的Adapter

3、Spinner常用操作：界面 和 事件

界面：

public class FormWidgitActivity extends AppCompatActivity {
       @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_form_widgit);        showSpinner();    }    public void showSpinner(){        Spinner spinner = (Spinner) findViewById(R.id.spinner);        //建立数据源        String[] myItemsString = getResources().getStringArray(R.array.spinnerName);        //建立Adapter，连接数据源        ArrayAdapter arrayAdapter = new ArrayAdapter(FormWidgitActivity.this,android.R.layout.simple_dropdown_item_1line,myItemsString);        //绑定Adapter到UI组件        spinner.setAdapter(arrayAdapter);    }}

事件：

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {            @Override            public void onItemSelected(AdapterView
    adapterView, View view, int i, long l) {                Toast.makeText(FormWidgitActivity.this,((TextView)view).getText().toString(),100).show();            }            @Override            public void onNothingSelected(AdapterView
    adapterView) {            }        });

4、扩展Adapter