流式佈局(瀑布流,Sqlite資料庫,shape)
阿新 • • 發佈：2018-12-21
第一步 ：佈局
首先先自定義佈局
import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.util.TypedValue; import android.view.View; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.TextView; public class FlowLayout extends FrameLayout { private float mText; public FlowLayout(Context context) { super(context); } public FlowLayout(Context context,AttributeSet attrs) { super(context, attrs); TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.flow); mText = array.getDimension(R.styleable.flow_textSize, 0); } public FlowLayout(Context context,AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.flow); mText = array.getDimension(R.styleable.flow_textSize, 0); } public void addTextView(String keys){ TextView view =(TextView) View.inflate(getContext(), R.layout.item, null); view.setText(keys); // view.setTextSize(TypedValue.COMPLEX_UNIT_PX,mText); LayoutParams params=new LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT); view.setLayoutParams(params); addView(view); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); int width = getWidth(); int row=0; int disWidth=20; for (int i=0;i<getChildCount();i++){ View at = getChildAt(i); int Vwidth = at.getWidth(); int Vheight = at.getHeight(); if (disWidth+Vwidth>width){ row++; disWidth=20; } int i1 = row * Vheight + row * 20; at.layout( disWidth,i1,disWidth+Vwidth,i1+Vheight ); disWidth+=(Vwidth+20); } } }
values中新增attrs.xml檔案
<resources>
<declare-styleable name="flow">
<attr name="textSize" format="dimension"></attr>
</declare-styleable>
</resources>自定義(shape)TextView邊框
引用自己寫的佈局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" 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" tools:context=".MainActivity"> <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" > <EditText android:id="@+id/edit" android:layout_weight="1" android:layout_width="match_parent" android:layout_height="wrap_content" android:drawableLeft="@mipmap/ic_launcher" /> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="搜尋"/> </LinearLayout> <TextView android:text="歷史紀錄" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <xf.com.week01.FlowLayout android:id="@+id/flow_one" android:textSize="50dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1"/> <TextView android:text="熱門搜尋" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <xf.com.week01.FlowLayout android:textSize="50dp" android:id="@+id/flow_two" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10dp" android:text="apple" android:background="@drawable/shap" android:textSize="20sp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10dp" android:text="iphone" android:background="@drawable/shap" android:textSize="20sp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10dp" android:text="華為" android:background="@drawable/shap" android:textSize="20sp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="10dp" android:text="小米" android:background="@drawable/shap" android:textSize="20sp" /> </xf.com.week01.FlowLayout> <Button android:onClick="onClick" android:layout_width="match_parent" android:layout_height="wrap_content" tools:ignore="OnClick" android:text="清除歷史紀錄"/> </LinearLayout>
主方法設定點選事件
import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private EditText edit; private Button button; private FlowLayout flow; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); edit = findViewById(R.id.edit); button = findViewById(R.id.button); flow = findViewById(R.id.flow_one); button.setOnClickListener(this); } @Override public void onClick(View v) { if (v.getId()==R.id.button){ String string = edit.getText().toString(); flow.addTextView(string); }else{ flow.removeAllViews(); } } }
簡單的流式佈局就寫完了
shape 邊框在drawable中新建佈局檔案
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke android:color="@color/colorAccent"
android:width="5dp"></stroke>
</shape>在TextView中設定background設定為自己寫的shape邊框就設定好啦
接下來就是巢狀資料庫
第一步;建立資料庫(這個大家都會)程式碼如下
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class Sqlite extends SQLiteOpenHelper {
public Sqlite(Context context) {
super(context, "user", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table user(personid integer primary key autoincrement,json test)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}然後寫資料庫中的四大方法(增刪改查)程式碼如下
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Build;
import android.os.CancellationSignal;
import android.support.annotation.RequiresApi;
public class SqlDao {
Context context;
private final SQLiteDatabase dao;
public SqlDao(Context context) {
this.context = context;
Sqlite sqlite=new Sqlite(context);
dao = sqlite.getWritableDatabase();
}
public long insertData(String table, String nullColumnHack, ContentValues values) {
return dao.insert(table, nullColumnHack, values);
}
public int deleteData(String table, String whereClause, String[] whereArgs){
return dao.delete(table,whereClause,whereArgs);
}
public Cursor queryData(String table, String[] columns, String selection,
String[] selectionArgs, String groupBy, String having,
String orderBy){
return dao.query(table,columns,selection,selectionArgs,groupBy,having,orderBy);
}
}
我就寫了三個方法沒寫修改可以根據自己的個人要求來寫增刪改查.這個並不是固定的
引用資料庫呼叫方法
查詢(如下)
Cursor user = dao.queryData("user", null, null,null, null, null, null);
if (user.moveToFirst()){
do {
String json = user.getString(user.getColumnIndex("json"));
mFlayout.addTextView(json);
}while(user.moveToNext());
}else{
Toast.makeText(MainActivity.this,"資料庫無資料！",Toast.LENGTH_SHORT).show();
}增加(如下)
ContentValues values=new ContentValues();
values.put("json",s);
dao.insertData("user",null,values);刪除(如下)
dao.deleteData("user",null,null);新增增刪改查到自己的專案中就OK了
資料庫的流式佈局就完成啦