java - 如何为 Activity 创建 Intent 二

Question

我是 Java 新手，所以它让我有点困惑，我想为 Activity 二创建一个 Intent ，但我编写的代码似乎有问题。

               @Override
                public void onClick(View v) {
                    // TODO:
                    // Launch Activity Two
                    // Hint: use Context's startActivity() method

                    // Create an intent stating which Activity you would like to
                    // start

                    Intent activityTwo = new Intent(ActivityTwo.this.finish());


                    Intent intent = null;

                    // Launch the Activity using the intent
                    startActivity(activityTwo);
                }
            });

            // Has previous state been saved?
            if (savedInstanceState != null) {

                // TODO:
                // Restore value of counters from saved state
                super.onRestoreInstanceState(savedInstanceState);
                mCreate = savedInstanceState.getInt(CREATE_KEY);
                mRestart = savedInstanceState.getInt(RESTART_KEY);
                mStart = savedInstanceState.getInt(START_KEY);




            }

		// Emit LogCat message
		Log.i(TAG, "Entered the onCreate() method");

		// TODO:

Answer 1

从第一到第二:

Button next = (Button) findViewById(R.id.button2);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
    Intent intent = new Intent(getApplicationContext(),Second.class);
    intent.putExtra("Tag", "Value");
    startActivity(intent);
    finish();
}});

第二到第一:

Button previous= (Button) findViewById(R.id.button);
previous.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
    Intent intent = new Intent(getApplicationContext(),First.class);
    startActivity(intent);
}});