单击ActionBar菜单项时，带有Android ActionBar的弹出对话框

Question

我正在构建一个需要在其中单击信息ActionBar项时通过另一个Android操作栏进行信息活动的应用程序。

这是activity_main_menu.xml的屏幕截图：

activity_main_menu.xml代码：

 <?xml version="1.0" encoding="utf-8"?> <menu 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" tools:context=".MainActivity"> <item android:id="@+id/menu_item_info" android:icon="@drawable/info_outline" android:title="@string/information" android:titleCondensed="@string/info" app:showAsAction="ifRoom" /> <item android:id="@+id/menu_item_share" android:title="@string/share" app:showAsAction="ifRoom" app:actionProviderClass="android.support.v7.widget.ShareActionProvider" /> </menu> 

单击“ menu_item_info”时，这是我要发生的情况： 所需结果

activity_main.xml代码：

 <?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:layout_height="match_parent" android:background="@color/colorPrimary" android:orientation="horizontal" tools:context=".MainActivity"> <!-- <clip xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:clipOrientation="vertical" android:drawable="@drawable/bitcoin" android:gravity="top" /> --> <TextView android:id="@+id/tvTotal" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:padding="10dp" android:text="Text" android:textColor="#FFFFFF" android:textSize="30sp" android:textStyle="bold" app:fontFamily="sans-serif" app:lineHeight="60dp" /> <ImageView android:id="@+id/ivBitcoin" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" android:contentDescription="You own text!" android:padding="10dp" app:srcCompat="@drawable/bitcoin" /> </LinearLayout> 

MainActivity.java代码：

package com.shikhar_mainalee.iownallbitcoin;

import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.PopupMenu;
import android.support.v7.widget.ShareActionProvider;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONObject;

import java.util.Collection;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private TextView tvTotal;
    private ImageView ivBitcoin;
    private ShareActionProvider mShareActionProvider;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvTotal = findViewById(R.id.tvTotal);
        ivBitcoin = findViewById(R.id.ivBitcoin);
        Main.ivBitcoin = ivBitcoin;
        tvTotal.setText("You Own\n21,000,000 / 21,000,000\nBTC!");

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate menu resource file.
        getMenuInflater().inflate(R.menu.activity_main_menu, menu);

        // Locate MenuItem with ShareActionProvider
        MenuItem item = menu.findItem(R.id.menu_item_share);

        // Fetch and store ShareActionProvider
        ShareActionProvider shareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
        shareActionProvider.setShareIntent(createShareIntent());
        new ShareActionProvider(this).setShareIntent(null);

        // Return true to display menu
        return super.onCreateOptionsMenu(menu);

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {

            case R.id.menu_item_info:
                // What code should go here?
                break;

            default:
                break;
        }

        return super.onOptionsItemSelected(item);

    }

    // Call to update the share intent
    private void setShareIntent(Intent shareIntent) {

        if (mShareActionProvider != null) {

            mShareActionProvider.setShareIntent(shareIntent);

        }

    }

}

最好的方法是什么？ 任何帮助表示赞赏！ 谢谢！

Answer 1

如果您想参加其他活动，则应该执行以下操作：

1. 创建另一个活动

2. 创建一个意图去参加那个活动

Intent myIntent = new Intent(this, SecondActivity.class);

3. 您可以在主要活动的任何地方调用该Intent。 在您的情况下：

@Override
    public boolean onOptionsItemSelected(MenuItem item) {


    switch (item.getItemId()) {

        case R.id.menu_item_info:
            startActivity(myIntent); // switch to second activity
            break;

        default:
            break;
    }

    return super.onOptionsItemSelected(item);

}

to change the second activity action bar menu you should create a new Menu and like your main activity Inflate it in onCreateOptionsMenu

getMenuInflater().inflate(R.menu.activity_second_menu, menu);

Answer 2

尝试这个：

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

这是android studio模板的示例。