Android开发手记(7) 按钮类控件的使用

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1、点击Button改变页面背景色

　　通过Button改变页面背景色，首先新建相应的对象，让后绑定到Layout上的元素。

final RelativeLayout layout = (RelativeLayout)this.findViewById(R.id.layout);final Button btnRed = (Button)this.findViewById(R.id.btnRed);

　　然后向新建的按钮增加单击事件。

btnRed.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                layout.setBackgroundColor(Color.RED);                ((Button)view).setText("Is Red");            }        });

完整代码：

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        this.setTitle("Button");        setContentView(R.layout.activity_main);        final RelativeLayout layout = (RelativeLayout)this.findViewById(R.id.layout);        final Button btnRed = (Button)this.findViewById(R.id.btnRed);        final Button btnGreen = (Button)this.findViewById(R.id.btnGreen);        final Button btnBlue = (Button)this.findViewById(R.id.btnBlue);        btnRed.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                btnGreen.setText("Green");                btnBlue.setText("Blue");                layout.setBackgroundColor(Color.RED);                ((Button)view).setText("Is Red");            }        });        btnGreen.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                btnRed.setText("Red");                btnBlue.setText("Blue");                layout.setBackgroundColor(Color.GREEN);                ((Button)view).setText("Is Green");            }        });        btnBlue.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                btnRed.setText("Red");                btnGreen.setText("Green");                layout.setBackgroundColor(Color.BLUE);                ((Button)view).setText("Is Blue");            }        });    }}

2、CheckBox状态获取

　　要获取CheckBox状态，只需要设置OnCheckedChangeListener()即可。

CheckBox chkFootball = (CheckBox) findViewById(R.id.chkFootball);chkFootball.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {                if (b) strFootball = "Football";                else strFootball = "";                tvResult.setText(strFootball + " " + strBasketball);            }        });

public class MainActivity extends AppCompatActivity {    private String strFootball = "";    private String strBasketball = "";    private TextView tvResult ;    private CheckBox chkFootball;    private CheckBox chkBasketball;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//        this.setTitle("Button");        setContentView(R.layout.activity_main);        tvResult = (TextView) findViewById(R.id.tvResult);        chkFootball = (CheckBox) findViewById(R.id.chkFootball);        chkBasketball = (CheckBox) findViewById((R.id.chkBasketball));        chkFootball.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {                if (b) strFootball = "Football";                else strFootball = "";                tvResult.setText(strFootball + " " + strBasketball);            }        });        chkBasketball.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {                if (b) strBasketball = "Basketball";                else strBasketball = "";                tvResult.setText(strFootball + " " + strBasketball);            }        });    }}

这里写图片描述

3、RadioButton与RadioGroup

　　要获取RadioGroup内RadioButton的选择状态，为RadioGroup添加选择事件即可。

rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {       @Override       public void onCheckedChanged(RadioGroup radioGroup, int i) {            // TODO       }});

　　首先在RadioGroup内创建两个RadioButton

<RadioGroup        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_below="@+id/textView"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:id="@+id/rGroup">        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="男"            android:id="@+id/rbMale"            android:checked="false" />        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="女"            android:id="@+id/rbFemale"            android:checked="false" />    </RadioGroup>

　　然后，为RadioGroup设置OnCheckedChangeListener()

rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup radioGroup, int i) {                if(i==rbMale.getId()) {                    result.setText("你的性别是：男");                }                else if(i==rbFemale.getId()){                    result.setText("你的性别是：女");                }            }        });

完整代码：

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.TextView;public class MainActivity extends AppCompatActivity {        private TextView result;        private RadioButton rbMale;        private RadioButton rbFemale;        private RadioGroup rGroup;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);//        this.setTitle("Button");            setContentView(R.layout.activity_main);            result = (TextView)findViewById(R.id.textView);            rbMale = (RadioButton)findViewById(R.id.rbMale);            rbFemale = (RadioButton)findViewById(R.id.rbFemale);            rGroup = (RadioGroup)findViewById(R.id.rGroup);            rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup radioGroup, int i) {                if(i==rbMale.getId()) {                    result.setText("你的性别是：男");                }                else if(i==rbFemale.getId()){                    result.setText("你的性别是：女");                }            }        });    }}

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