Android编程入门-第10天

这次主要是按照书上的把CheatActivity给完成了import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewAnimationUtils;
import android.widget.Button;
import android.widget.TextView;

public class CheatActivity extends AppCompatActivity {

private static final String EXTRA_ANSWER_IS_TRUE =
"com.bignerdranch.android.geoquiz.answer_is_true";
private static final String EXTRA_ANSWER_SHOWN =
"com.bignerdranch.android.geoquiz.answer_shown";

private boolean mAnswerIsTrue;

private TextView mAnswerTextView;
private Button mShowAnswerButton;

public static Intent newIntent(Context packageContext, boolean answerIsTrue) {
Intent intent = new Intent(packageContext, CheatActivity.class);
intent.putExtra(EXTRA_ANSWER_IS_TRUE, answerIsTrue);
return intent;
}

public static boolean wasAnswerShown(Intent result) {
return result.getBooleanExtra(EXTRA_ANSWER_SHOWN, false);
}

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

mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);

mAnswerTextView = (TextView) findViewById(R.id.answer_text_view);

mShowAnswerButton = (Button) findViewById(R.id.show_answer_button);
mShowAnswerButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button);
} else {
mAnswerTextView.setText(R.string.false_button);
}
setAnswerShownResult(true);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
int cx = mShowAnswerButton.getWidth() / 2;
int cy = mShowAnswerButton.getHeight() / 2;
float radius = mShowAnswerButton.getWidth();
Animator anim = ViewAnimationUtils
.createCircularReveal(mShowAnswerButton, cx, cy, radius, 0);
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mShowAnswerButton.setVisibility(View.INVISIBLE);
}
});
anim.start();
} else {
mShowAnswerButton.setVisibility(View.INVISIBLE);
}
}
});
}

private void setAnswerShownResult(boolean isAnswerShown) {
Intent data = new Intent();
data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}
}