Refresh/Reload Android 中的自定义视图

Question

我有一个 CustomView，它在其 View 上显示一个数字，这个数字来自数据库。首先工作正常，当我移动到另一个 Activity，更改数据库数量并调用 finish(); 方法时，第一个 Activity 将出现，我想刷新或重新加载 CustomView在第一次加载时初始化以显示其更新值。怎么可能？

这是我的自定义类：

public class Navigation extends LinearLayout {


public Navigation(Context context) {
    super(context);
    this.initComponent(context);
}

public Navigation(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.initComponent(context);
}

private void initComponent(Context context) {

    LayoutInflater inflater = LayoutInflater.from(context);
    View v = inflater.inflate(R.layout.navigation_bar, null, false);
    this.setOrientation(VERTICAL);
    this.addView(v);

    LinearLayout workorder = (LinearLayout) v.findViewById(R.id.workorder);

    PersianTextView workorder_count = (PersianTextView) v.findViewById(R.id.workorder_count);

    workorder.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
            getContext().startActivity(new Intent(getContext(),Workorders.class));
        }
    });

    database db = new database(getContext());
    db.open();
    Cursor cu = db.Display_shared("SELECT * FROM [Workorder_Repair] WHERE [Workorder_Repair_For_Department_ID] = "+ Login.dep_id+" AND [Workorder_Repair_Status] = 1");

    if(cu.getCount()>0)
        workorder_count.setText(""+cu.getCount());
    else
        workorder_count.setVisibility(INVISIBLE);

}

我在将近 15 个活动中使用它，我想刷新它

Answer 1

您可以通过调用 activity 的 onResume() 方法或 onActivityResult() 方法

从数据库中获取值并更新其值并分配给您的自定义视图

package com.dialogdemo;

import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;

public class Navigation extends LinearLayout {

    PersianTextView workorder_count;
    public Navigation(Context context) {
        super(context);
        this.initComponent(context);
    }

    public Navigation(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.initComponent(context);
    }

    private void initComponent(Context context) {

        LayoutInflater inflater = LayoutInflater.from(context);
        View v = inflater.inflate(R.layout.navigation_bar, null, false);
        this.setOrientation(VERTICAL);
        this.addView(v);

        LinearLayout workorder = (LinearLayout) v.findViewById(R.id.workorder);

         workorder_count = (PersianTextView) v.findViewById(R.id.workorder_count);

        workorder.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                getContext().startActivity(new Intent(getContext(), Workorders.class));
            }
        });

        refreshView();

    }

    public void refreshView(){
        database db = new database(getContext());
        db.open();
        Cursor cu = db.Display_shared("SELECT * FROM [Workorder_Repair] WHERE [Workorder_Repair_For_Department_ID] = " + Login.dep_id + " AND [Workorder_Repair_Status] = 1");

        if (cu.getCount() > 0)
            workorder_count.setText("" + cu.getCount());
        else
            workorder_count.setVisibility(INVISIBLE);
    }
}

在您的所有活动中调用 onResume() 中的 refreshView() 方法

Answer 2

我在我的 CustomView 中添加了一个名为 update(); 的函数，并从第一个 Activity 的 onResume 方法调用它，如下所示：

((CustomView) findViewById(R.id.customview)).update();

Refresh/Reload Android 中的自定义视图

Refresh/Reload CustomView in Android

java

android

custom-view

android-custom-view