使用TextView创建到Activity的链接

Question

我有一个Activity叫MainActivity.java的activity_main.xml文件。但是我不知道如何创建一个链接来启动另一个名为的活动DirectionActivity。以下是我的代码示例。

strings.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="app_name">EEMA</string>
     <string name="action_settings">Settings</string>
     <string name="hello_world">The Emergency Evacuation Mobile App!</string>
     <string name="directions">\n\nTo view directions click here!</string>
     <string name="title_activity_direction">DirectionActivity</string>
     <string name="title_activity_main">MainActivity</string>
</resources>

activity_main.xml文本视图

<TextView  android:id="@+id/txtView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="" 
    android:textSize="12sp"
    android:textColorLink="#FFFF00"
    android:textStyle="bold"
/>

MainActivity.java

public class MainMenuActivity extends Activity {
    public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";

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

        String str = "Please click here to view Directions";
        TextView txtView = (TextView) findViewById(R.id.txtView);
        txtView.setText(str);
        Linkify.addLinks(txtView, Linkify.ALL);     
    }

    @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, menu);
        return true;
    }
}

DirectionActivity.java

public class DirectionActivity extends Activity {

    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent intent = getIntent();
        String message = intent.getStringExtra(MainMenuActivity.EXTRA_MESSAGE);

        // Create the text view    
        TextView textView = new TextView(this);    
        textView.setTextSize(40);    
        textView.setText(message);

        // Set the text view as the activity layout    
        setContentView(textView);       
        setContentView(R.layout.activity_direction);

        // Make sure we're running on Honeycomb or higher to use ActionBar APIs        
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {            
            // Show the Up button in the action bar.            
            getActionBar().setDisplayHomeAsUpEnabled(true);        
        }       
    }
}

那么，我需要怎么做才能获得“请单击此处查看路线”链接的链接，该链接将打开DirectionActivity？

Answer 1

您想做两件事。首先，您想要在单击时发生一些事情TextView。其次，您要启动一个新的Activity。

要完成第一件事，在活动类的onCreate方法中，您需要类似以下内容：

final TextView txtView = this.findViewById(R.id.txtView);
txtView.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        ...
    }
});

要完成第二件事，如果Activity要启动，则调用DirectionActivity：

final TextView txtView = this.findViewById(R.id.txtView);
txtView.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        MainMenuActivity.this.startActivity(new Intent(MainMenuActivity.this, DirectionActivity.class));
    }
});