Android学习第5天-优快云博客

本文介绍了一个简单的Android应用——作弊活动(CheatActivity)的实现过程。该应用通过一个按钮展示问题的答案，并将答案是否显示的结果返回给上一级组件。文章详细展示了如何使用Intent传递布尔型参数及如何设置和获取返回结果。

Android学习第5天

代码

CheatActivaty.java

package com.bignerdranch.android.geoquiz;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
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);
            }
        });
    }

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

转载于:https://www.cnblogs.com/zhouheng0918/p/9119793.html