流式佈局+搜尋框(歷史記錄+資料庫)
阿新 • • 發佈：2018-12-29
//FrameLayout 裡面的程式碼
public class LiuLayout extends FrameLayout { private final int V_With=20; public LiuLayout(Context context) { super(context); } public LiuLayout(Context context, AttributeSet attrs) { super(context, attrs); } public LiuLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public void addTextView(String name) { TextView textView = (TextView) View.inflate(getContext(), R.layout.liu_item, null); textView.setText(name); LayoutParams layoutParams = new LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); textView.setLayoutParams(layoutParams); addView(textView); //Log.e("zmz", "新增成功!"); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); //獲取本控制元件的寬度 int width = getWidth(); //行數 int row = 0; //子控制元件開始座標 int disWith = V_With; for (int i = 0; i < getChildCount(); i++) { //尋找子控制元件 View child = getChildAt(i); //子控制元件的寬高 int childWidth = child.getWidth(); int childHeight = child.getHeight(); //判斷是否滿行, if (disWith + childWidth > width) { //如果滿行,則換行 row++; //子控制元件開始座標還原 disWith = V_With; } child.layout(disWith, row * childHeight, disWith + childWidth, childHeight * (row + 1)); disWith += childWidth; } } }
//Activity裡面的程式碼
public class MainActivity extends AppCompatActivity implements View.OnClickListener { LiuLayout liuLayout; EditText editText; Button button; Dao dao; ArrayList<String>list; TextView del_textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //尋找控制元件 editText = findViewById(R.id.edi_name); button = findViewById(R.id.button_ss); liuLayout = findViewById(R.id.liuLayout); del_textView = findViewById(R.id.del_text); //點選事件 button.setOnClickListener(this); del_textView.setOnClickListener(this); //建立資料庫 dao = new Dao(this); //查詢資料庫資料新增到流式佈局 initData(); } private void initData() { Cursor cursor = dao.sel("person",null,"",new String[]{},null,null,null); while (cursor.moveToNext()){ String name = cursor.getString(cursor.getColumnIndex("name")); liuLayout.addTextView(name); } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.button_ss: //獲取資料新增到流式佈局和資料庫 addData(); break; case R.id.del_text: //刪除,需要把資料庫裡的資料也要刪除 delData(); break; } //清除輸入框中的值 editText.getText().clear(); } private void delData() { //提示框 AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("提示"); builder.setPositiveButton("確定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { list = new ArrayList<String>(); //先查出有什麼資料 Cursor cursor = dao.sel("person",null,"",new String[]{},null,null,null); while (cursor.moveToNext()){ String names = cursor.getString(cursor.getColumnIndex("name")); //存入list集合作為刪除的欄位 list.add(names); } //迴圈刪除資料庫的資料 for (int i = 0; i <list.size() ; i++) { long delete = dao.del("person","name=?",new String[]{list.get(i)}); } //刪除流式佈局的內容 liuLayout.removeAllViews(); } }); builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "您點選了取消!", Toast.LENGTH_SHORT).show(); } }); builder.show(); } private void addData() { //獲取輸入框中的值 String name = editText.getText().toString().trim(); //非空判斷 if (name.isEmpty()) { Toast.makeText(this, "請輸入搜尋內容", Toast.LENGTH_SHORT).show(); return; } //新增到流式佈局 liuLayout.addTextView(name); //新增資料庫 ContentValues values = new ContentValues(); values.put("name",name); long insert = dao.add("person",null,values); } }
//dao層
public class Dao { private SQLiteDatabase db; public Dao(Context context) { MHolder mHolder = new MHolder(context); db = mHolder.getWritableDatabase(); } public long add(String table, String nullColumnHack, ContentValues values) { return db.insert(table,nullColumnHack,values); } public Cursor sel(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy){ return db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy); } public long del(String table, String whereClause, String[] whereArgs) { return db.delete(table,whereClause,whereArgs); } }
//佈局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal">
<EditText
android:id="@+id/edi_name"
android:layout_width="300dp"
android:background="@drawable/sty_color"
android:hint="請輸入......."
android:layout_height="wrap_content" />
<Button
android:id="@+id/button_ss"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:text="搜尋"
android:background="@drawable/btn_color"/>
</LinearLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="15sp"
android:text="搜尋歷史:"/>
<TextView
android:id="@+id/del_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:padding="10dp"
android:textSize="10sp"
android:text="清除歷史記錄"/>
</RelativeLayout>
<zhao.com.hy.LiuLayout
android:id="@+id/liuLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
</zhao.com.hy.LiuLayout>
</LinearLayout>
//效果圖
