Android筆記——動態添加刪除控件，及添加點擊事件

爲了讓自己的酷歐天氣有個能夠根據數據庫動態添加TextView和按鈕來顯示已添加城市的界面，便開始着手於如標題所示的一個小Demo。
效果如圖，能同時動態添加Button和TextView，還能通過動態添加的點擊事件同時刪除被點擊的Button和TextView。

add.gif

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.button_add2.MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1">
        <ScrollView
            android:id="@+id/scrollView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="none">
            <LinearLayout
                android:id="@+id/linearlayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:isScrollContainer="true"
                android:padding="10dp">
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal">

                </LinearLayout>

            </LinearLayout>

        </ScrollView>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btn_add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#34ab8b"
            android:layout_margin="10dip"
            android:text="添加"
            android:textSize="18dp"
            android:textColor="#fff"/>
        <Button
            android:id="@+id/btn_edit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#34ab8b"
            android:layout_margin="10dip"
            android:text="編輯"
            android:textSize="18dp"
            android:textColor="#fff"/>
    </LinearLayout>
</LinearLayout>

public class MainActivity extends AppCompatActivity {
    private LinearLayout linearLayout;
    //Button索引
    private LinkedList<Button> ListBtn_Show;
    //TextView索引
    private LinkedList<TextView> ListText_Def;
    private Button btn_add, btn_edit;
    //判斷btn_edit的狀態
    private int EDITSTATE = 0;

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

    private void inited() {
        linearLayout = (LinearLayout) findViewById(R.id.linearlayout);
        ListBtn_Show = new LinkedList<Button>();
        ListText_Def = new LinkedList<TextView>();
        btn_edit = (Button) findViewById(R.id.btn_edit);
        btn_add = (Button) findViewById(R.id.btn_add);
        btn_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                addBtn();//動態添加按鈕
            }
        });
        btn_edit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //判斷編輯按鈕的狀態
                if (EDITSTATE == 0) {
                    btn_edit.setText("確定");
                    EDITSTATE = 1;
                } else if (EDITSTATE == 1) {
                    btn_edit.setText("編輯");
                    EDITSTATE = 0;
                }
            }
        });
    }

    private void addBtn() {//動態添加按鈕
        //添加承載兩個按鈕的LinearLayout
        LinearLayout linear_btn = new LinearLayout(this);
        linear_btn.setOrientation(LinearLayout.HORIZONTAL);
        LinearLayout.LayoutParams liParam = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
        linear_btn.setLayoutParams(liParam);

        //添加Button
        Button btnShow = new Button(this);
        LinearLayout.LayoutParams btnAddPar = new LinearLayout.LayoutParams
                (ViewGroup.LayoutParams.WRAP_CONTENT, 80, 3);//設置寬高及佔比
        btnAddPar.setMargins(0, 10, 0, 10);
        btnShow.setLayoutParams(btnAddPar);
        btnShow.setText(ListBtn_Show.size() + "");
        btnShow.setTextColor(Color.argb(255, 255, 255, 255));
        btnShow.setBackgroundColor(Color.argb(255, 52, 171, 139));
        btnShow.setOnClickListener(new View.OnClickListener() {//動態添加點擊事件
            @Override
            public void onClick(View view) {
                if (EDITSTATE == 1)
                    delBtn(view);//動態刪除按鈕
            }
        });
        linear_btn.addView(btnShow);//把btnShow添加到linear_btn中
        ListBtn_Show.add(btnShow);//把btnShow添加到索引中

        //添加TextView
        TextView textDef = new TextView(this);
        LinearLayout.LayoutParams btnDefPar = new LinearLayout.LayoutParams
                (ViewGroup.LayoutParams.WRAP_CONTENT, 80, 1);//設置寬高及佔比
        btnDefPar.setMargins(0, 10, 0, 10);
        textDef.setLayoutParams(btnDefPar);
        textDef.setText("設爲默認");
        textDef.setGravity(Gravity.CENTER);
        textDef.setTextColor(Color.argb(255, 255, 255, 255));
        textDef.setBackgroundColor(Color.argb(255, 52, 171, 139));
        textDef.setOnClickListener(new View.OnClickListener() {//動態添加點擊事件
            @Override
            public void onClick(View view) {
                setDef(view);//設置默認
            }
        });
        linear_btn.addView(textDef);//把textDef添加到linear_btn中
        ListText_Def.add(textDef);//把textDef添加到索引中
        
        linearLayout.addView(linear_btn);//把linear_btn添加到外層linearLayout中
    }
    private void setDef(View view){//設置默認
        //遍歷索引裏的所有TextView
        for(int i=0;i<ListText_Def.size();i++){
            ListText_Def.get(i).setBackgroundColor(Color.argb(255, 52, 171, 139));
            ListText_Def.get(i).setText("設爲默認");
            if(ListText_Def.get(i)==view){
                view.setBackgroundColor(Color.argb(255, 171, 52, 56));
                ListText_Def.get(i).setText("默認");
            }
        }
    }
    private void delBtn(View view) {//動態刪除按鈕
        if (view == null) {
            return;
        }
        int position = -1;
        for (int i = 0; i < ListBtn_Show.size(); i++) {
            if (ListBtn_Show.get(i) == view) {
                position = i;
                break;
            }
        }
        if (position >= 0) {
            ListBtn_Show.remove(position);//從索引中移除被刪除的Button
            ListText_Def.remove(position);//從索引中移除被刪除的TextView
            linearLayout.removeViewAt(position + 1);//在外出linearLayout刪除內部指定位置所有控件
        }
    }
}