搜索栏+流式布局+数据库

要求：自定义View实现搜索控件；流式布局；sqlite数据库
总的效果图：

//一.布局

1.搜索栏的展示：

LinearLayout
xmlns:android=“http://schemas.android.com/apk/res/android” android:layout_width=“match_parent”
android:layout_height=“match_parent”>

/LinearLayout>

**创建一个类加载头部布局 查找控件。
public class MyView extends LinearLayout {

private EditText editText;
private TextView mCancel;

public MyView(Context context, AttributeSet attrs) {
    super(context, attrs);

    LayoutInflater.from(context).inflate(R.layout.header_view,this);
    editText = findViewById(R.id.Search_Edit);
    mCancel = findViewById(R.id.Cancel_Text);
}

}
2.搜索历史的展示：

LinearLayout
xmlns:android=“http://schemas.android.com/apk/res/android” android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:orientation=“vertical”>

/LinearLayout>
3.总的布局：

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:layout_height=“match_parent”
android:orientation=“vertical”
tools:context=".MainActivity">

/LinearLayout>

二、具体的代码执行

1.流式布局内容实现

①新建一个类MyFlawLayout继承LinearLayout
②public class MyFlawLayout extends LinearLayout {

private final int mScreenWidth;

public MyFlawLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    //得到屏幕的宽高
    DisplayMetrics metrics = context.getResources().getDisplayMetrics();
    mScreenWidth = metrics.widthPixels;
    int mScreenHeight= metrics.heightPixels;
    //设置布局垂直显示
    setOrientation(VERTICAL);

}

public void getData(List data){
    LinearLayout linearLayout = getlinearLayout();
    for (int i = 0; i =textWidth+LinWith){
            linearLayout.addView(textView);
        }else {
            linearLayout=getlinearLayout();
            linearLayout.addView(textView);
        }
    }
}
//初始化子LinearLayout
public LinearLayout getlinearLayout(){
    LinearLayout linearLayout = new LinearLayout(getContext());
    LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
    linearLayout.setLayoutParams(params);
    this.addView(linearLayout);//this本类对象 只要重新添加View就自动换行了
    return linearLayout;
}
//初始化TextView
public TextView getTextView(){
    TextView textView = new TextView(getContext());
    textView.setTextSize(20);
    //textView框的样式
    textView.setBackgroundResource(R.drawable.item);
    textView.setTextColor(Color.parseColor("#FF181718"));
    textView.setPadding(10,10,10,10);
    return textView;
}

}

2.MainActivity
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private String[] data = new String[]{"闪电法师", "山东干豆腐", "风格", "大红色进口范德萨发货", "闪电法师",
        "山东干豆腐", "风格", "大使馆的方法都不", "护甲", "极度疯狂"};
private List list = new ArrayList<>();
private EditText Search_Edit;
private TextView Cancel_Text;
private TextView history_delete;
private MyFlawLayout lishi_MyFlaw;
private ContentResolver resolver;
private Uri uri;


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

    resolver = getContentResolver();
    uri = Uri.parse("content://com.example.shujvku.provider.MyProvider/zhou");

    initView();

    //流式布局
    MyFlawLayout myFlawLayout = findViewById(R.id.myFlaw);
    for (int i = 0; i < data.length; i++) {
        list.add(data[i]);
    }
    myFlawLayout.getData(list);
}

//得到数据库的数据
private List getSel(){
    List mhistory = new ArrayList<>();
    Cursor cursor = resolver.query(uri, null, null, null, null);
    while (cursor.moveToNext()){
        String uname = cursor.getString(cursor.getColumnIndex("name"));
        mhistory.add(uname);
    }
    //查到数据后在第一个显示
    List mString=new ArrayList<>();
    for (int i = mhistory.size()-1; i >=0; i--) {
        mString.add(mhistory.get(i));
    }
    return mString;
}

private void initView() {
    Search_Edit = (EditText) findViewById(R.id.Search_Edit);
    Cancel_Text = (TextView) findViewById(R.id.Cancel_Text);
    history_delete = (TextView) findViewById(R.id.history_delete);

    lishi_MyFlaw = (MyFlawLayout) findViewById(R.id.lishi_MyFlaw);
    List sel = getSel();
    lishi_MyFlaw.getData(sel);

    Cancel_Text.setOnClickListener(this);
    history_delete.setOnClickListener(this);
}
//搜索的方法
private void submit() {
    // validate
    String Edit = Search_Edit.getText().toString().trim();
    if (TextUtils.isEmpty(Edit)) {
        Toast.makeText(this, "输入搜索的内容", Toast.LENGTH_SHORT).show();
        return;
    }else{
        Toast.makeText(this, Edit, Toast.LENGTH_SHORT).show();
        ContentValues values=new ContentValues();
        values.put("name",Search_Edit.getText().toString().trim());
        resolver.insert(uri,values);
        //实时更新数据
        lishi_MyFlaw.removeAllViews();
        List sel = getSel();
        lishi_MyFlaw.getData(sel);
    }
}

//点击事件
@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.Cancel_Text:
            submit();
            break;

        case R.id.history_delete:
            List strings = getSel();
            for (int i = 0; i 

}
3.创建MyHelper在数据库创建表格，MyProvider查询 删除