Android-选择项目的Toast消息

Question

How can I display a Toast messages for the items I've chosen in my layout?

For example, I have 15 ImageView s that are selectable , for example I've selected ImageView s 1, 2 and 3. A toast will appear when I click a button , "You've chosen ImageView s 1, 2, 3."

By the way, I've used setTag to know when an ImageView is selected. I've setup setTag("1") for the views that is selected and setTag("0") for the rest.

Sample code that I've tried:

public void onClick(View v) {
    String message = "You've chosen";
        if (v.getTag().toString().equals("1")) {
            message = message + " " + ivCircles[i].getId();
        }
    }
    Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
    finish();
}

Answer 1

为每个图像设置contentDescription，并在选择其中一个图像后获取内容描述

Toast.makeText(context,imageview.getContentDiscription(),Toast.LENGTH_SHORT).show();

Answer 2

您需要使用ActionMode类。

Answer 3

This line should be in onClick method of ImageView

message = message + " " + view.getId();

This line should be a global variable

public static String message = "You've chosen";

After toast displayed in onClick method of the button, the global varibale should be initiated again

Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
message = "You've chosen";

Answer 4

Try this way,hope this will help you to solve your problem.

activity_main.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/lnrItems"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    </LinearLayout>
</ScrollView>

MainActivity.java

public class MainActivity extends Activity {

    private LinearLayout lnrItems;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lnrItems = (LinearLayout) findViewById(R.id.lnrItems);

        for (int i=1;i<=15;i++){
            ImageView imageView = new ImageView(this);
            imageView.setId(i);
            imageView.setTag(String.valueOf(i));
            imageView.setImageResource(R.drawable.ic_launcher);
            imageView.setAdjustViewBounds(true);
            imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(MainActivity.this,"You've chosen ImageViews "+v.getTag().toString(),Toast.LENGTH_SHORT).show();
                }
            });
            lnrItems.addView(imageView);
        }
    }
}