我正在开发一个应用程序,我需要根据某些操作导航到特定 Activity 。这是一张图片
我的第一个 Activity 是 ReadingActivity。基于某些操作,用户将被带到 NewProjectReadingActivity。用户将有两个选择。
选项一
方案二
根据用户选择的选项,他/她将被带到 ReadingInputActivity。从 ReadingInputActivity 获取输入后,用户将被转发到 ReadingConfirmationActivity。会有三个选项
选项一
方案二
方案三
如果用户选择选项一,那么他/她将被带到非常简单的 ReadingActivity。我将清除堆栈并再次启动 ReadingActivity,如果他/她按下后退按钮,应用程序将最小化,这完全没问题。但是,如果用户选择选项二,那么他/她将被带到 NewProjectReadingActivity。如果我清除 Activity 堆栈并再次启动 NewProjectReadingActivity,那么它将启动 NewProjectReadingActivity,但问题是如果用户按下后退按钮,它将最小化我的应用程序,因为它是 Activity 堆栈中唯一存在的 Activity 。
我想要的是,如果用户在 ReadingConfirmationActivity 上选择选项二,那么用户将被带到 NewReadingActivity,这意味着我想删除 ReadingConfirmationActivity(这很容易,只需调用 finish())并且 Activity 在此之前开始 Activity 即 ReadingInputActivity。
上面提到的每个 Activity 都托管一个 fragment 。我在下面提供 Activity 代码。
阅读 Activity
public class ReadingActivity extends BaseAppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if( savedInstanceState == null ) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, ReadingFragment.getInstance(), ReadingFragment.TAG).commit();
}
setDisplayHomeAsUpEnabled(true);
setActionBarText(getString(R.string.new_project_reading));
}
@Override
protected void setupContentView() {
setContentView(R.layout.activity_reading);
}
public static Intent newIntent(Context context) {
Intent intent = new Intent(context, ReadingActivity.class);
return intent;
}
}
新建项目阅读 Activity
public class NewProjectReadingActivity extends BaseAppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if( savedInstanceState == null ) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, NewProjectReadingFragment.getInstance(), NewProjectReadingFragment.TAG).commit();
}
setDisplayHomeAsUpEnabled(true);
setActionBarText(getString(R.string.new_project_reading));
}
@Override
protected void setupContentView() {
setContentView(R.layout.activity_new_project_reading);
}
public static Intent newIntent(Context context) {
Intent intent = new Intent(context, NewProjectReadingActivity.class);
return intent;
}
}
阅读输入 Activity
public class ReadingInputActivity extends BaseAppCompatActivity {
private static final String EXTRA_VALUE_TYPE = "value_type";
private int valueType = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
valueType = getIntent().getIntExtra(EXTRA_VALUE_TYPE, 0);
if( savedInstanceState == null ) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, ReadingInputFragment.getInstance(valueType), ReadingInputFragment.TAG).commit();
}
setDisplayHomeAsUpEnabled(true);
setActionBarText(getString(R.string.reading_input));
}
@Override
protected void setupContentView() {
setContentView(R.layout.activity_reading_input);
}
public static Intent newIntent(Context context, int valueType) {
Intent intent = new Intent(context, ReadingInputActivity.class);
intent.putExtra(EXTRA_VALUE_TYPE, valueType);
return intent;
}
}
阅读确认 Activity
public class ReadingConfirmationActivity extends BaseAppCompatActivity {
private static final String EXTRA_VALUE_TYPE = "value_type";
private static final String EXTRA_READING_VALUE = "reading_value";
private int valueType = 0;
private double readingValue = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
valueType = getIntent().getIntExtra(EXTRA_VALUE_TYPE, 0);
readingValue = getIntent().getDoubleExtra(EXTRA_READING_VALUE, 0);
if( savedInstanceState == null ) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, ReadingConfirmationFragment.getInstance(valueType, readingValue), ReadingConfirmationFragment.TAG).commit();
}
setDisplayHomeAsUpEnabled(true);
setActionBarText(getString(R.string.reading_input));
}
@Override
protected void setupContentView() {
setContentView(R.layout.activity_reading_confirmation);
}
public static Intent newIntent(Context context, int valueType, double readingValue) {
Intent intent = new Intent(context, ReadingConfirmationActivity.class);
intent.putExtra(EXTRA_VALUE_TYPE, valueType);
intent.putExtra(EXTRA_READING_VALUE, readingValue);
return intent;
}
}
最佳答案
你写道:
What i want is that if the user selects Option Two on the
ReadingConfirmationActivity
then the user will be taken to theNewReadingActivity
that means i want to removeReadingConfirmationActivity
(which is easy just call the finish()) and the activity started before that activity i,eReadingInputActivity
.
为此,当用户在 ReadingConfirmationActivity
中选择选项二时,您将执行以下操作:
Intent intent = new Intent(this, NewReadingActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
这将导致顶部(包括)的所有 Activity NewReadingActivity
完成。 NewReadingActivity
的新实例将被创建并显示给用户。如果您希望返回到 NewReadingActivity
的现有实例,您也可以通过添加 Intent.FLAG_ACTIVITY_SINGLE_TOP
来做到这一点到 Intent
.
关于android - 如何根据某些操作从 Activity 堆栈中删除特定 Activity/Activity ?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53705970/